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Electro-Osmosis of Water



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US6145244
Methods for enhancing phytoextraction of contaminants from porous media using electrokinetic phenomena

The present invention relates to a method of remediating soil, water, and other porous media contaminated with organic and/or inorganic contaminants using plants in conjunction with an electric field applied through the medium to control movement of the contaminants and enhance removal of the contaminants from the medium.  Applying an electric field in soil induces electromigration (movement of ions in the pore fluid), as well as electroosmosis (movement of pore water) and electrophoresis (movement of charged particles in soil such as colloids). In the present invention these phenomena are beneficially utilized to control the transport of charged and/or non-charged contaminants in soil within the plant root zone (rhizosphere) and to bring contaminants into the root zone, perhaps from a contaminated zone located deeper in the soil than the root zone. The effectiveness of the phytoremediation is also enhanced by preventing the soil from becoming so strongly acidic or basic as to kill the plants. The present invention significantly extends the utility of phytoremediation to cleanup of soils with deeper contamination plumes than are typically accessible to the roots of plants.



CN106436686  
Device used for collecting electroosmosis drainage and soft clay foundation treatment device and method

The invention discloses a device used for collecting electroosmosis drainage and a soft clay foundation treatment device and method. The device used for collecting the electroosmosis drainage comprises a pre-pressing plate provided with a plurality of through holes in the longitudinal direction, a water bag fixed to the upper surface of the pre-pressing plate and capable of adjusting the amount of water inside the water bag, and a pipe body communicated with the through holes and a water suction pump. The device is used for collecting water discharged out of the position of an electroosmosis cathode, water can be injected into the water bag to serve as stack load which is applied to a soil body nearby the cathode by means of the pre-pressing plate, drainage of the electroosmosis cathode is further facilitated, solidification of a soil body between a negative electrode and a positive electrode is more uniform, and the problem that collection of the electroosmosis drainage is difficult can be solved.



CN205473307
Electroosmosis dewatering system

The utility model discloses an electroosmosis dewatering system, including mud memory cell, electroosmosis filter press and water treatment unit, wherein, mud memory cell is provided with mud moisture content on -line measuring unit, and each pipeline all is provided with the flowmeter, is provided with voltage controller and regulating power supply in the electroosmosis filter press, and electroosmosis dewatering system includes the data processing unit that is used for calculating interior mud moisture content of electroosmosis filter press and formation voltage instruction, can adjust regulating power supply's filter press 2 in real time through this data processing unit. The utility model discloses an electroosmosis dewatering system can directly carry out the electroosmosis to 80%~96% high moisture content mud to be handled, need not to utilize other equipment to carry out dehydration just, the pressure regulating to regulating power supply can be realized through data processing unit and voltage controller, best electroosmosis dehydration efficiency is ensured to reach, the pressure regulating can reduce mud calorific capacity, reduces harmful gas production volume, increases substantially electroosmosis dehydration efficiency, the sludge treatment cost has been practiced thrift.



CN105839614
Electroosmosis and drainage high-strength warp knitting geogrid

The invention discloses an electroosmosis and drainage high-strength warp knitting geogrid. The geogrid comprises a basal body layer; the basal body layer includes multiple warp yarns and multiple weft yarns perpendicular to each other; and each warp yarn and each weft yarn are connected through a binding yarn in the contacted place. The geogrid is characterized in that electric conducting copper cores are wrapped in the warp yarns and the weft yarns; and a corrosion resistant coating layer is arranged on the outer surface of the basal body layer. The geogrid is higher in physical strength to reach 1000 kN/m, is better in biological and chemical corrosion resistance, is better in electric conducting performance, realizes longitudinal movement of silt particles, solves the drainage curing efficiency problem of hydraulic reclamation engineering in the prior art, improves the construction efficiency, improves the foundation bearing capacity after drainage curing, and can synchronously finish the drainage curing and soft soil reinforcing purposes by once construction.



CN105735075
Electroosmosis solidification processing method for temporary constructed roadbed at dredger fill field

The invention discloses an electroosmosis solidification processing method for a temporary constructed roadbed at a dredger fill field. The processing method comprises the following steps of paving geogrids in the dredger fill silt layer by layer, so that the lateral deformation of a dredger fill body is limited; and after the geogrids are dredged to a certain height, performing rapid drainage consolidation on the roadbed through an electroosmosis method. According to the processing method disclosed by the invention, a synthesis technology of the geogrids and grouting pipes is adopted, and the grouting pipes are horizontally arranged at intervals between the geogrids; the grouting pipes and the geogrids are integrally made; a plurality of grouting holes of which the opening directions are downward are distributed in the grouting pipes at intervals; a solidifier penetrates downwards from a surface layer through the grouting pipes and the grouting holes, and the effect of the solidifier can be exerted adequately; besides, after the solidifier reacts with the dredger fill, the bearing capacity and the tensile strength of the geogrids can be improved, and the whole bearing capacity of the roadbed dredger fill is further improved. In the later stage of electroosmosis, after gaps are formed between iron pipes and the dredger fill body, clay slurry is grouted into the grouting iron pipes and enters the gaps between electric poles and the dredger fill body through the grouting holes, so that the electroosmosis effect can be improved.



CN105544618
Electroosmosis seepage-preventing and damp-preventing method utilizing ground as negative electrode and applying to underground space

The invention provides an electroosmosis seepage-preventing and damp-preventing method utilizing the ground as the negative electrode and applying to underground space. According to the method, holes are drilled in a grounded wall isolated by rocks or soil at intervals, a positive electrode material is arranged in each drilled hole, a closed circuit is formed with the negative electrode area of the ground, a rectification and current stabilization converter is connected to each positive electrode material through a wire, 220 V alternating currents are output and rectified through the converter, converted into direct currents through the converter and supplied to the positive electrode materials, the grounded wall makes contact with the rectified positive electrode materials, the currents are output by a power supply, flow through the positive electrode materials, reach the grounded wall in the positive electrode material area and finally flow to the negative electrode area of the rocks or soil, water molecules in the grounded wall are led to the negative electrode area by making contact with the wall positively charged, and therefore the surface of the grounded wall can keep dry; meanwhile, free water in the rocks or soil are migrated to the negative electrode area under the effect of positive electrode and negative electrode electric fields, and therefore seepage and damp can be prevented.



CN105481222
Electroosmosis dehydration system

The invention discloses an electroosmosis dehydration system. The electroosmosis dehydration system comprises a sludge storage unit, an electroosmosis plate-and-frame filter press and a water treatment unit, wherein the sludge storage unit comprises a sludge water content on-line detection unit; each pipe is provided with a flow meter; a voltage controller and a voltage controlled power source are arranged in the electroosmosis plate-and-frame filter press; the electroosmosis dehydration system further comprises a data processing unit used for calculating the water content of sludge in the electroosmosis plate-and-frame filter press and generating a voltage directive, and the working voltage of the voltage controlled power source can be regulated in real time. The electroosmosis dehydration system can perform electroosmosis treatment directly on 80%-96% of the sludge with high water content and perform primary dehydration without other equipment; the voltage of the voltage controlled power source can be regulated through the data processing unit and the voltage controller, and the optimal electroosmosis dehydration efficiency is guaranteed; the sludge heat emission can be reduced through voltage regulation, production amount of harmful gas can be reduced, and the electroosmosis dehydration efficiency can be improved remarkably; the sludge treatment cost is saved.



CN105439414
Electroosmosis dewatering machine

An electroosmosis dewatering machine comprises an upper tank and a lower tank. A flange at the bottom end of the upper tank is fixedly connected with a flange at the top end of the lower tank through a bolt. A rubber seal ring is arranged between the two flanges. A positive electrode lifting device is arranged above the top end of the upper tank, and comprises a support installed above the upper tank. The support is a square frame. A central hole is formed in the center of a face plate at the top end of the frame. A lead screw is arranged in the central hole. The lead screw extends into the upper tank through the central hole. The lead screw is connected with an adjusting nut in a screwed mode. The vertical lifting height of the lead screw is adjusted through the adjusting nut. The tail end of the lead screw is connected with an insulating rod. A positive electrode plate is arranged on the insulating rod. The positive electrode plate is a triangular prism spliced by five plate bodies. A rotating handle is arranged at the top end of the lead screw. A cone bucket is arranged in the lower tank and internally provided with a negative electrode plate. A spiral conveying device is arranged below the cone bucket. A U-shaped conveying groove of the spiral conveying device is right opposite to the tail end of the cone bucket. A water seepage plate is arranged on the bottom face of the conveying groove and is formed by wrapping a porous plate by filter cloth.



CN104594333
Treatment method for soft clay foundations of annular electroosmosis single well drainage

The invention discloses a treatment method for soft clay foundations of annular electroosmosis single well drainage. The method comprises the steps of excavating a single well, driving electrodes, conducting electroosmosis, conducting drainage and the like, wherein electrode annular arrays are driven into the soft clay foundations for multiple circles and distributed in the shape of a plum blossom; each circle of the electrodes is connected separately through a wire, the outermost circle of the wire is connected with a positive pole of a direct-current power supply, and a circle, next to the outermost circle, of the wire is connected with the negative pole of the direct-current power supply; circular electroosmotic flow from outside to inside is formed in clay through turning on the direct-current power supply, so that each two adjacent circles of electrodes are electrified from outside to inside in sequence; electroosmosis steps above are repeated till the water in the soft clay in the treatment scope is drained into the single well, and the water in the single well is drained into the earth surface. According to the treatment method for soft clay foundations of annular electroosmosis single well drainage, the operation is simple, and drainage reinforcement of the soft clay foundations is applicable.



CN203795411
Device for treating swelling soil in electroosmosis manner

A device for treating swelling soil in an electroosmosis manner comprises a plurality of electroosmosis electrodes, a plurality of first electrode leads, a plurality of second electrode leads, a power source, two metal wires and two voltage measuring meters, wherein the electroosmosis electrodes are inlaid in swelling soil and are arrayed in rows; each first electrode lead and each second electrode lead are respectively connected with the corresponding two rows of electroosmosis electrodes adjacent to the first electrode lead and the second electrode lead; the power source comprises a positive pole and a negative pole; the first electrode leads and the second electrode leads are respectively connected to different poles of the power source, so that each two rows of electroosmosis electrodes which are adjacent to the corresponding first electrode lead and the corresponding second electrode lead are respectively connected to the positive pole and the negative pole of the power source; the two metal wires are inlaid in the swelling soil; one metal wire is close to one of the electroosmosis electrodes connected to the positive pole; the other metal wire is close to one of the electroosmosis electrodes connected to the negative pole; and the two metal wires are connected with the negative poles of the power source through the two voltage measuring meters respectively.



CN103866760
Method and device for accelerating ultra-soft soil solidification through dual-passage variable-polarity vacuum electroosmosis

The invention relates to a method and a device for accelerating ultra-soft soil solidification through dual-passage variable-polarity vacuum electroosmosis. The method comprises the following steps: 1) laying a geotextile; 2) inserting composite drainage plates in rows; 3) laying a dual-passage closed vacuum drainage PVC (Polyvinyl Chloride) main pipe and branch pipes; 4) connecting the composite drainage plates with the branch pipes by using closed quick plate and pipe connectors which can be connected with conducting wires; 5) serially connecting the composite drainage plates by using electroosmosis conducting wires to form an electroosmosis electrode array and laying a vacuum membrane;; 6) starting a vacuum electroosmosis combined working mode and dynamically controlling polarity variation of a vacuum drainage main valve and composite drainage plates according to parameters such as water output. The device comprises the composite drainage plates, dual-passage vacuum pre-pressing drainage main and branch pipes and an electroosmosis variable-polarity system.; The method and the device for accelerating ultra-soft soil solidification through dual-passage variable-polarity vacuum electroosmosis have the remarkable advantages that the effective superposition for facilitating water migration through the production of a vacuum pressure field and an electric field is realized, the loss of a single anode is reduced, the energy consumption per unit time is reduced, the drainage and solidification efficiency is improved by 2-5 times, the construction is simple and convenient to perform, the load time is short and the cost is saved.



CN103321208
Vacuum-electroosmosis combined soft foundation reinforcing treatment system utilizing alternative arrangement of long and short cathodes

The invention relates to a vacuum-electroosmosis combined soft foundation reinforcing treatment system utilizing alternative arrangement of long and short cathodes. The vacuum-electroosmosis combined soft foundation reinforcing treatment system comprises a vacuumizing device, long reinforcement anodes, a geomembrane sealing system, drainage branches, plastic drain boards, short reinforcement cathodes, composite cathode conductor wires, seal joints, long reinforcement cathodes, three-way joints, a main drainage pipe, sealing adhesive tapes and a direct-current power supply. The short reinforcement cathodes and the long reinforcement cathodes are arranged alternatively, the reinforcement cathodes and the long reinforcement anodes are arranged every other row, and distance among the electrodes of the same polarity is smaller than that among the electrodes of different polarity.; By the vacuum-electroosmosis combined soft foundation reinforcing treatment system, treatment effect of deep soil of the soft foundation is improved, construction time is shortened, and construction cost is saved.



CN203178229
Experimental device for consolidating soft clay by electroosmosis under anode follow-up action

The utility model relates to an experimental device for consolidating soft clay by electroosmosis under the anode follow-up action. The device comprises a model case, an electroosmotic cathode, an electroosmotic anode and a power supply, wherein the model case comprises water collection chambers on the two sides and a sample chamber in the middle; the sample chamber and the water collection chambers on the two sides are separated by clapboards with cuts at the lower ends; the electroosmotic cathode and the electroosmotic anode respectively cling to the two ends of the sample chamber; and the power supply is connected with the electroosmotic cathode and the electroosmotic anode by power supply clips. Compared with the prior art, the experimental device has the advantages of simple structure, accuracy in detection and the like.



CN103276719
Apparatus and method for stabilizing clay by microbiological-electroosmosis processes

The invention discloses an apparatus and a method for stabilizing clay by microbiological-electroosmosis processes. The apparatus comprises culture dishes, nutrient solution dishes, a direct-current power supply, microbiological-electroosmotic devices, thermometers and cooling devices. The method includes the steps of firstly, burying cathodes and anodes of the microbiological-electroosmotic devices on two sides of clay to be treated, inserting the thermometers to the center line of the clay to be treated, and arranging the culture dishes and the nutrient solution dishes near the microbiological-electroosmotic devices; secondly, putting Bacillus pasteurii into the culture dishes, putting urea containing dissolved calcium salt into the nutrient solution dishes, culturing strains, and injecting the urea nutrient solution mixed with the strains and the dissolved calcium salt into the microbiological-electroosmotic devices and the clay; thirdly, turning on the direct-current power supply to perform electroosmosis while controlling the temperature to be lower than 50 DEG C. Compared with the prior art, the apparatus and the method have the advantages of good stabilization effect, high cost performance and convenience in operation without weather effect.



CN103215946
Electroosmosis electrode and electroosmosis draining system thereof

The invention discloses an electroosmosis draining system based on a sectional type electroosmosis electrode, which comprise sectional draining electrode pipes, conductive filter cloth, a programmable direct current power supply, a draining pipe, a timing controller, a cable, a vacuum pump, a region optimizing device and a seismic wave real-time monitoring alarm, wherein the sectional draining electrode pipes are in thread connection by soft conductive connectors, are wrapped by the conductive filter cloth on the outside, meet the requirements of construction environments on mechanical properties and corrosion resistant property, and can still be used for a long time after multiple times of earthquakes and electroosmosis, and the use efficiency of electroosmosis equipment during soft base treatment can be improved by the uninterruptible electrifying of an electroosmosis instrument,; thus reducing the construction cost. Excess pore water pressure generated by earthquake action can be timely discharged from a draining channel by the electroosmosis and vacuum negative actions, thus avoiding the shock damage to upper-part soil body and the earthquake liquefaction of a liquefied soil layer caused by the excess pore water pressure. The electroosmosis electrode and the electroosmosis draining system thereof are simple in structure, convenient to construct, durable and practical, and provides technical support and guarantee for promotion and application of an electroosmosis method on the fields such as soft base reinforcing and earthquake fortification of buildings.



CN102817355
Simple reinforcing method of vacuum electroosmosis combined prepressing soft soil foundation

The invention discloses a simple reinforcing method of a vacuum electroosmosis combined prepressing soft soil foundation, and the method is used for overcoming the poor characteristics of high water content, high compressibility and low shearing strength of a sludge soft clay foundation. The simple reinforcing method comprises the following steps of: firstly, laying a geotechnical cloth or knitted mesh on the surface of a foundation to be processed; then arranging novel longitudinal drainage boards with different lengths, setting a transverse closed drainage system, hermetically connecting longitudinal and transverse systems, lapping conduction wire systems; laying a vacuum sealing film to ensure that the system does not leak air, and pumping water and gas passing through the novel longitudinal drainage boards and the transverse drainage system by using a vacuum pump; connecting the conduction wire systems to the positive pole and negative pole of a power supply, and pumping the water and the gas passing through the novel longitudinal drainage systems and the transverse drainage system by adopting a vacuum electroosmosis combined method; and finally, removing the sealing film, recovering the transverse drainage system and the conduction wire systems, and rolling and leveling ground.



CN102653990
Bidirectional electroosmosis repairing method of corrosive concrete structure

The invention discloses a bidirectional electroosmosis repairing method of a corrosive concrete structure. The method comprises the following steps of: injecting a corrosion inhibitor into electrolyte; with the steel bar in the concrete as a cathode, paving a stainless steel net on the concrete surface as an anode; immersing the anode into the electrolyte containing the corrosion inhibitor; applying DC (direct current) power between the anode and cathode, and controlling the applied current density to be 1-5A/m<2> based on the total surface area of the steel bar; and cutting off the power 10-20 days later. The method disclosed by the invention is convenient to operate, improves the moving ability of the cationic corrosion inhibitor, and can enable the corrosion inhibitor to enter the steel bar surface through electroosmosis in relatively short time; through the invention, the chloride ions in a concrete protection layer can be effectively removed, and the precipitation rate of chloride ions is high; and moreover, the corrosion potential of the corroded steel bar is increased, the corrosion rate is reduced, re-passivation is realized, the salt-damaged concrete structure is repaired to the greatest degree, and the service life of the structure is prolonged according to the expected requirements.



CN102535432
Vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system and method

A vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system consists of telescopic water drainage electrodes, a conductive circuit, a direct-current power supply, horizontal water drainage pipes and a vacuum pump, wherein the water drainage electrodes, the conductive circuit and the horizontal drainage pipes are all arranged below a vacuum film, and the telescopic water drainage electrodes with telescopic upper ends are capable of being powered on and draining water. A vacuumizing-electroosmosis-stacking combined soft-foundation consolidating method includes the technical steps of arranging plastic water drainage plates and the water drainage electrodes, connecting the horizontal water drainage pipes and leads, paving geotextile, performing vacuumizing, electroosmosis and stacking preloading, and compressing the water drainage electrodes and the like.; By the vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system, the difficult problem of combination of electroosmosis, vacuum preloading and stacking preloading is solved, and three foundation treatment methods of electroosmosis, vacuum preloading and stacking preloading are combined so that the vacuumizing-electroosmosis-stacking combined soft-foundation consolidating method is particularly suitable for silt-based soft foundation with low osmotic coefficient and capable of shortening foundation treatment period and improving treatment effect greatly and is an economic and practical soft-foundation treatment method.



TW200641209
Method of converting current for improving the soil by electroosmosis and the apparatus thereof

When an electric potential is applied across a wet soil mass, cations of double layer in a soil would be attracted to the cathode and anions to the anode. As these cations migrate to the cathode, they drag water with them. Because there are more cations than anions in a soil containing negatively charged clay particles, there is a net flow of water towards the cathode. Since the flows of water towards the cathode cause soil consolidation. The electroosmosis of ground improvement on soft ground has been carried out by Casagrande. However, the method was not applied widely. It uses the filter or the rectifier to filter the minus wave of the alternating current having the sine wave of alternate plus and minus or to convert the minus wave to plus wave. Electric potential is applied by the harmonic wave of direct current, and the chloride and silicate solutions are injected via the grouting pipe near the anode and the relaying grouting pipe into soil. The injected chloride and silicate solutions increase conductivity of the soil and amount of drained water. Such process will also cause soil particles cemented. The new electroosmosis with the injection of chloride saline solution and the relaying grouting pipe can certainly enhance the electroosmostic effect of improvement, shorten the time of treatment and increase improvement range. Furthermore, owing to use the filter or the rectifier to replace the traditional rectifier transforming to constant voltage, it can reduce substantially the facility cost of electroosmosis.



CN102162239
Soft soil foundation treated by chemical-solution-combined injection electroosmosis method and construction method of soft soil foundation

The invention provides a soft soil foundation treated by chemical solution-combined injection electroosmosis method and a construction method of the soft soil foundation, and belongs to the technical field of processing of the soft soil foundation. A metal electrode is inserted into the soft soil foundation; different chemical solutions are injected into a positive electrode and a negative electrode respectively, and a direct current is fed; under a direct current field, water and a cation  solution which have positive charges flow towards the negative electrode, and an ion solution with negative charges flows towards the positive electrode so as to form electroosmosis chemical reaction; at the same time, the water is pumped and discharged from the top of the negative electrode so as to reduce the water ratio in the soil, accelerate concretion and compaction of the soil, and enhance the strength of the soil; and precipitates produced by the chemical reaction can cement the soil particles. Compared with other soft soil foundation treatment methods, the construction method has the advantages of more environment friendliness, lower energy consumption and saved treatment cost, and large-size mechanical equipment and building materials such as cements, sand, stones and the like are not required. By the method, the construction process is simple, the operability is high, the quality is convenient to control and detect, and the intensity of the soil is enhanced obviously.



CN101813603
Soil body osmotic coefficient measurement method and device based on electroosmosis

The invention relates to soil body osmotic coefficient measurement method and device based on electroosmosis, belonging to the technical field of measurement of soil body osmotic coefficients. The soil body osmotic coefficient measurement method is characterized by comprising the steps of: putting a saturated specimen into a cylindrical container made of insulating materials, sealing one end of the saturated specimen by using a cathode-sealed electrode plate, isolating from a water tank by using an anode permeable electrode plate, injecting water in the water tank, applying a direct current voltage between the cathode electrode plate and the anode electrode plate, rapidly forming a reverse hydraulic gradient of the saturated specimen under the electroosmosis, enabling the hydraulic gradient to be in balance with potential gradient rapidly, measuring the potential gradient ie and the hydraulic gradient ih under the balance state, coupling to obtain keie+khih=o under the balance state because an electroosmosis coefficient ke is known, and computing to obtain the soil body osmotic coefficient kh. The invention can greatly reduce the measurement time of a low-permeability clay electroosmosis coefficient, improves the measurement efficiency and the accuracy of the measurement result, and effectively lowers the cost; and the measurement device has high automatism and simple and easy test operation, and is beneficial to popularization.



CN101634141
Multifunctional soil electroosmosis solidification device

A multifunctional soil electroosmosis solidification device is provided with a soil sample room which consists of an outer soil sample room wall, a base at the lower end of the outer soil sample room wall and a top cover at the upper end of the outer soil sample room wall. An upper partition and a lower partition which are made of filter paper, electrodes and bearing water through plates are arranged in the soil sample room. The upper partition is provided with a loading plate. The upper and the lower electrodes are respectively connected with an upper and a lower conductive wire. The base is provided with a water discharge pipe and a water outlet. The loading plate is also provided with a water discharge pipe and a water outlet.; The multifunctional soil electroosmosis solidification device can carry out electroosmosis solidification, loading solidification and electroosmosis and loading combined solidification, causes a uniform and stable one-dimensional electric field to be formed in the soil body, facilitates the calculation of relative parameters, uniforms the electroosmosis direction, the water discharge direction and the soil deforming direction, conforms to the one-dimensional electroosmosis solidification theory and provides convenience for calculation and analysis. The multifunctional soil electroosmosis solidification device can monitor main parameters in a test in the real time.; Moreover, the multifunctional soil electroosmosis solidification device can measure an electroosmosis coefficient and a soil resistance so as to cause the electroosmosis solidification design to be more scientific and reasonable.



CN101457521
Electroosmosis method and apparatus for dehydration for large area high moisture percentage earth body

The invention relates to an electroosmotic method used for dewatering the soil with large area and high water content and equipment thereof. The operation comprises the following steps of: (1) constant current starting: adopting a constant current output mode, namely the output current is constant and the output voltage is variable; (2) constant voltage holding: when the output voltage reaches a preset value, the output voltage is converted into stable voltage and then output, namely the output voltage is constant and the output current is variable, and the stable working condition is held for long time; (3) strengthening impulse: in the process of holding constant voltage, impulse voltage is superimposed by a certain interval; (4) energization at intervals: energization and power off are carried out alternatively; and (5) polarity convention: according to the change of water yield, the positive polarity and the negative polarity of output voltage of the special electroosmotic device are automatically changed. By improving the operation method to electroosmotic dewatering, the invention solves the defects in the prior art, improves dewatering efficiency and reduces the energy consumption.



US5240570
Surfactant augmented in-situ removal of PCBs from soil by electroosmosis

In-situ extraction of contaminants, such as PCBs, from soil is achieved by an electroosmosis technique. The soil is treated with a low concentration surfactant solution used as a purging liquid. The contaminant is dissolved in the ground water, aided by the purging liquid. An electric field is applied to a region of the soil causing the ground water, contaminant and surfactant to move by electroosmosis to a collection point where the purging liquid, dissolved contaminant and surfactant are collected and removed from the soil. This method may also be used to control the direction of seepage of the contaminants.



US5092972
Field-effect electroosmosis

Apparatus and process for controlling the rate of electroosmosis due to a first electric potential in an electrically insulating capillary, in which a second electric potential is applied between the electrically insulating walls of the capillary and a liquid within the capillary. This second electric potential changes the charge on the wall of the capillary, and thus allows manipulation of the zeta potential within the capillary, and therefore the rate of electroosmosis.



US5074986
Electroosmosis techniques for removing materials from soil

A method for removing contaminant material from a soil site in which one or more porous source electrodes and one or more porous sink electrodes are positioned within the soil site and voltage gradients are established among the electrodes. A purging liquid is supplied to the source electrodes so as to flow therefrom into the soil site, the voltage gradients causing the purging liquid to move by electroosmosis through the soil site toward the sink electrodes. The purging liquid displaces the contaminant material so as to cause the contaminant material to be moved from the soil site into the sink electrodes from which they can be removed, as by a pumping or siphoning action.



TW200632190
Construction method for ground modification by electroosmosis

An construction method for ground modification by electroosmosis is provided, which comprises steps of: a ground body is provided, a positive electrode and a negative electrode are respectively buried on the opposite side of the ground body, a grouting multi-passageway tube and a draining multi-passageway tube are respectively buried on the opposite side of the ground body, a diffusion speed accelerating device is provided between the grouting multi-passageway tube and the draining multi-passageway tube, a first soil strength enhancing medium and a second soil strength enhancing medium are provided, and the first soil strength enhancing medium and the second soil strength enhancing medium are grouted into the grouting multi-passageway tube and the diffusion speed accelerating device, so that the diffusion speed of the first and the second soil strength enhancing mediums in the ground body can be accelerated.



JPS6452906
GROUND-SILICIFYING SOLIDIFICATION WORK USING ELECTROOSMOSIS PHENOMENON

PURPOSE:To improve the ground by solidification by a method in which sodium silicate solution is injected into a pipe on anode side while applying DC voltage between paired perforated injection tubes penetrated into the ground, the inside of the pipe is washed, and calcium chloride solution is injected. CONSTITUTION:Perforated injection tubes 1 and 2 are set at an interval corresponding to the permeability of soil 3 in soft ground, and DC voltage is applied to the tubes 1 and 2 as anode and cathode. Under the condition, sodium silicate solution is injected into the tube 1 from its opening 10, the application of the voltage is temporarily stopped, and the inside of the tube 1 is washed. Calcium chloride solution is then injected into the tube 1 from its opening 10 while applying the voltage to the tube again.; The solutions can thus be uniformly permeated into the ground for solidification by utilizing an electroosmosis phenomenon



JPH10309562
METHOD FOR PURIFYING CONTAMINATED SOIL BY ELECTROOSMOSIS

PROBLEM TO BE SOLVED: To efficiently purify contaminated soil even when the soil is low in ground water permeability or the soil exists deep in the ground. SOLUTION: An electrode rod 4 is inserted into the contaminated region 2a of clayey soil 2, the electrode rod 4 is connected to the anode of a DC power source V, a well 6 is dug outside the contaminated region 2a, a conductor 7 provided in the well 6 is connected to the cathode of the power source V, and a submerged pump P is set in the well 6. The water in the clayey soil 2 is forcedly discharged from the electrode rod 4 side as an anode toward the well contg. the conductor 7 as a cathode by electroosmosis when the power source V is driven, hence a contamination source 3 and the contaminant in the region 2a are discharged into the well 6 along with the ground water and drawn up by the pump P, and the soil is purified.
 


JPS52155808
METHOD OF AND APPARATUS FOR DRIVING PILE BY WAY OF ELECTROOSMOSIS

An apparatus and method of assisting the driving of a hollow pile into soil by electro-osmosis in which electrical direct current is directed downwardly through the inside of the pile, out the bottom of the pile, and up the outside of the pile whereby water on the inside of the pile moves through the soil thereby making the pile easier to drive into the soil. The method includes insulating an electrically conductive pile preferably on the inside with an electrical non-conductor and placing water inside of the hollow pile. An electrical circuit having a d-c power source, and an anode and cathode is provided in which the anode is placed in the water inside of the hollow pile and the cathode is placed outside of the hollow pile and in electrical communication with the outside of the electrical conductive pile whereby an electrical circuit is formed between the anode and cathode through the water in the inside of the pile and through the bottom of the pile. When electrical power is supplied to the circuit, water will move down the inside of the pile and up the outside of the pile and into the soil adjacent the pile making the pile easier to drive through the soil. In addition, after the pile has been driven, the current flow may be reversed through the electrical circuit for reducing the water content of the soil adjacent the pile thereby increasing the load bearing strength of the soil.



JPH06226300
METHOD AND DEVICE FOR TREATING WATER-CONTAINING SOIL ON SITE BY ELECTROOSMOSIS

PURPOSE:To directly treat water-contg. soil on the treating site with a simple structure and to provide a device capable of treating the soil by electroosmosis without
contaminating the environment around the site. CONSTITUTION:An electrode combination 2 consisting of a central electrode 2A and plural peripheral electrodes 2B surrounding the electrode 2A is successively and adjacently arranged in the water-contg. soil treating region. Current and voltage are impressed in parallel between the electrode combinations to dehydrate the soil by electroosmosis, and then the polarity of the impressed voltage is inverted to restore the value of the treating region.; Since the structure is simple and a mechanically operating part is not needed, the soil is directly treated on the site, and the secondary contamination of the treated soil or its surroundings due to the change in # value is prevented as a current is applied in the reverse direction.



US6126802
Method and device for regulating and optimizing transport of humidity by means of electroosmosis

In a method for regulating and optimizing transport of liquid in a porous structure by means of electroosmosis, a pulse pattern applied to one or more electrode pairs which are used during the electroosmosis is regulated by detecting a potential difference INCREMENT Vp over the electrode pair or electrode pairs during the duration t3 of a neutral pulse which forms part of the pulse pattern and subsequently regulating either the duration t3 of the neutral pulse or the duration Tp of the pulse pattern or both on the basis of the detected potential difference INCREMENT Vp and any change therein from measuring cycle to measuring cycle. A device for implementing the method comprises a power source with a pulse generator which supplies the desired pulse patterns to one or more electrode pairs (A, K) with the anode (A) provided in the porous structure and the cathode (K) in earth respectively, a voltage detector connected in series via each electrode pair (A, K) and a program control unit in a loop between the voltage detector and the power source's pulse generator.



US5368709
Method and apparatus for controlling the relative humidity in concrete and masonry structures

In a method for eliminating humidity from concrete and masonry structures by means of electroosmosis, current pulses which are supplied in a determined pattern are used. The pulse voltage is limited to +/-40 V. In order to generate the pulses and feed the electrodes a special electronic control device is used. The invention relates to a method and means for controlling the relative humidity in concrete and masonry, including masonry wherein cement is used as a bonding agent. The structure may be reinforced or not, and the method may also be used in plaster, mortar in stone masonry and light concrete structures.





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