33 results about "Electrodialysis reversal" patented technology

A non-Faraday ionic species removal process and system is described. The system includes a power supply, a pump for transporting a liquid through the system, and a plurality of porous electrodes. The electrodes , each include an electrically conductive porous portion. The electrodes may also include a substrate contiguous with the porous portion. The porous electrode can be utilized in electrodialysis and electrodialysis reversal systems. A method for forming a porous electrode is described.

The invention relates to a desalination system and a desalination method. The desalination system comprises an electrodialysis reversal device, a sediment unit and a back-washing filtering device, wherein the electrodialysis reversal device is capable of receiving first fluid, carrying out desalination treatment on the first fluid, and receiving second fluid to move away ions removed from the first fluid. The sediment unit is communicated with the fluid of the electrodialysis reversal device and is used for providing the second fluid and enabling the second fluid to circulate between the sediment unit and the electrodialysis reversal device. The back-washing filtering device is arranged between the electrodialysis reversal device and the sediment unit, is communicated with the fluids, and is used for filtering the second fluid under a normal operation mode.

The invention discloses an ionic conductive separator plate applied to an electrodialysis reversal device. The ionic conductive separator plate comprises a plastic net and a polymer coating layer applied to the plastic net. The polymer coating layer contains a charged group, the form of the polymer coating layer has interconnected ion clusters, and interconnected ion clusters allow ions to be macroscopically continuously transported through the surface of the plastic net. The invention also discloses the electrodialysis reversal device using the ionic conductive separator plate, and a production method of the ionic conductive separator plate.

Provided is a wastewater treatment method using an electrodialysis reversal (EDR)-electrochemical wastewater treatment (EWT) combined process, the method including: separating inflow wastewater which contains nitrogen compounds into product water and concentrated water using an EDR facility; and decomposing the concentrated water into target materials to be eliminated from the wastewater in an EWT facility. Provided is a wastewater treatment method for decomposing inflow water containing a nitrogen-containing compound into target materials to be eliminated using an EWT facility alone. According to the wastewater treatment method, product water which is flowed out from an EDR facility can be reused as raw water, and the method guarantees reliability and stability by simultaneously processing recalcitrant COD and T-N in the concentrated water. The wastewater treatment method efficiently removes recalcitrant COD and T-N, which are derived from ethanolamine (ETA), in wastewater produced in a power plant and an industrial facility using ETA as a pH-adjusting agent. EDR-EWT process can be easily combined with a common wastewater treatment and can efficiently and stably treat wastewater containing recalcitrant COD and T-N. Therefore, the method can actively satisfy the strengthening environmental regulation criteria.

The invention provides a seawater desalination method for an integrated membrane process and belongs to a water desalination technology. Aiming at the defects of high investment, high pressure, high energy consumption and the like in an existing membrane-method seawater desalination process, 'nanofiltration / electrodialysis reversal' is taken as a core desalination process, wherein during nanofiltration, a high-desalination nanofiltration membrane with desalination ratio of 90% is adopted; during electrodialysis reversal, a thin-type electrode chamber is filled with a multistage multi-section energy-saving electroosmosis device provided with mixed-bed ion exchange resin. Seawater raw water is sequentially pretreated by virtue of a coagulative precipitation tank, a settling tank, a sand filter and an ultrafiltration membrane, and then is subjected to graded desaltination sequentially by virtue of a nanofiltration desalination device with an energy recovery device, and an energy-saving frequent electrodialysis reversal device; nanofiltration and energy-saving electrodialysis are respectively performed at low operation pressures which do not exceed 3.8MPa and 0.4MPa; the salt content of water produced by the system is 80-250mg / L, the total desalinization ratio can be mechanically regulated within a range of 99-99.75%, the body power consumption of per ton of water does not exceed 2.15KWh / m<3>, the investment and energy consumption of the whole seawater desalination process are obviously reduced, and the process operation is relatively safe and stable.

The invention provides a method for treating and recycling industrial circulating wastewater, which comprises the following steps of: adding a polyacrylamide flocculant into the circulating wastewater to perform flocculation reaction, wherein 4 to 8mg of flocculant is added into every 1L of sewage and the flocculation reaction time is controlled to be at least 5 minutes; allowing the sewage afterthe flocculation reaction to enter a high-efficiency floatation tank, controlling the air floatation time to be at least 10 minutes, allowing the air floatation water to discharge into a filter tank,and discharging the water after filtering; adding an acid into the filtered discharged water to regulate the alkalinity of the water body, adding a scale inhibitor and delivering the water to a cartridge filter; and delivering the filtered effluent from the cartridge filter to an electrodialysis reversal system to perform desalination, wherein the effluent treated by the electrodialysis reversal system is used as make-up water for circulating water. The method can more effectively realize continuous treatment of the sewage and water production without using nanofiltration and reverse osmosis technology; the treated sewage keeps a certain amount of ions; and the effluent meets the requirements of the water quality of reused water of a circulating water system.

The invention discloses an evaluation method for concentration effect of hydrogen iodide in iodine-containing hydriodic acid by using an electrolysis-electrodialysis device, which belongs to the technical field of electrochemistry. According to the evaluation method, an electrolysis-electrodialysis cell treated by the electrolysis-electrodialysis device is repeatedly washed by using washing liquid containing iodine ions and deionized water, then the difference of the masses of the washing liquid containing iodine ions and the deionized water before and after washing is calculated, and the mass of residual liquid in the electrolysis-electrodialysis cell is calculated through balance according to the law of conservation of mass; therefore, evaluation errors caused by the residual liquid in the electrolysis-electrodialysis cell are reduced, the electrolysis-electrodialysis cell does not need to be dismounted, the whole process is simple and quick, and the method has strong operability and a high practical value.

The invention discloses a system for preparing demineralized water by recycling reverse osmosis concentrated water and belongs to the technical field of water treatment. The system comprises a reverse osmosis concentrated water tank, a booster pump, an ultrafilter, an electrodialysis water inlet tank, an electrodialysis reversal device, a primary water inlet tank, a dosing system, a primary high-pressure pump, a primary security filter, a primary reverse osmosis device or nanofiltration device, a secondary water inlet tank, a secondary high-pressure pump, a secondary security filter, a secondary reverse osmosis device or nanofiltration device, an EDI or ion exchange mixed bed water inlet tank, an EDI device or ion exchange mixed bed device, and a demineralized water tank. The system has the advantages of being simple in structure, easy to operate, high in concentrated water recycling rate, low in operating cost, long in service life, high in economic efficiency and the like. The system can be matched with water treatment equipment such as a sea water desalination device and a boiler water device, and is efficient, easy to use, capable of being used for a long time and high in reliability and innovativeness.