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Method for treating reverse osmosis concentrated water by using electrochemical water treatment device

A technology for reverse osmosis concentrated water and water treatment devices, which is applied in chemical instruments and methods, oxidized water/sewage treatment, special compound water treatment, etc., and can solve the problems of low filling density, large device footprint, and low filtration efficiency. , to achieve the effect of low packing density, large floor space and high packing density

Pending Publication Date: 2022-05-27
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing conductive membrane water treatment technology has the problems of large device footprint, low packing density, and low filtration efficiency.

Method used

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  • Method for treating reverse osmosis concentrated water by using electrochemical water treatment device
  • Method for treating reverse osmosis concentrated water by using electrochemical water treatment device
  • Method for treating reverse osmosis concentrated water by using electrochemical water treatment device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The reverse osmosis concentrated water is treated by a coiled electrochemical water treatment device. The main salt ions in the reverse osmosis concentrated water are SO 4 2- (100mg·L -1 ), Cl - (350mg·L -1 ), Ca 2+ , Na + , Mg 2+ , K + and clonidazole (10 mg L -1 ) pollutants.

[0043] The wound-type electrochemical water treatment device is integrated with a conductive filter membrane and a heterogeneous Fenton-like system, and includes a reactor body and a wound-type membrane assembly. structure as figure 1 and figure 2 As shown, the device includes a cylindrical shell of 70×110 cm, a wound membrane module and an aeration device arranged in the cylindrical shell. The cross section of the wound membrane module is C-shaped, and includes an electrode mesh 1 , an insulating mesh 2 , a conductive filter membrane 3 , a flow channel spacer 5 and a diversion bag 4 . The electrode mesh 1 is the anode, and the positive electrode of the DC power supply 10 is extern...

Embodiment 2

[0054] Utilize the electrochemical water treatment device of Example 1 to treat the reverse osmosis concentrated water, and the main salt ions in the simulated reverse osmosis concentrated water are SO 4 2- (100mg·L -1 ), Cl - (350mg·L -1 ), Ca 2+ , Na + , Mg 2+ , K + and clonidazole (10 mg L -1 ) pollutants.

[0055] The difference between the processing steps and Example 1 is: the advanced oxidizing agent adopts sodium persulfate, 250ml of simulated reverse osmosis concentrated water is mixed with sodium persulfate solution, and the mixed sodium persulfate solution concentration is 10mmol L. -1 , Sodium persulfate catalyzes the generation of hydroxyl radicals, sulfate radicals, etc. on the carbon nanotube conductive filter membrane 3 loaded with cerium oxide, and oxidizes and degrades organic pollutants in reverse osmosis concentrated water. Then after two cycles, the removal efficiency of clonidazole in reverse osmosis concentrated water reaches 85%.

Embodiment 3

[0057] Utilize the electrochemical water treatment device of Example 1 to treat the reverse osmosis concentrated water, and the main salt ions in the simulated reverse osmosis concentrated water are SO 4 2- (250mg·L -1 ), Cl - (132mg·L -1 ), Ca 2+ , Na + , Mg 2+ , K + and clonidazole (10 mg L -1 ) pollutants.

[0058] The difference between the processing steps and Example 1 is: the advanced oxidizing agent adopts sodium hypochlorite, 250ml simulated reverse osmosis concentrated water mixes the sodium hypochlorite solution, and the mixed sodium hypochlorite solution concentration is 10mmol·L -1 . Then after two cycles, the removal efficiency of clonidazole in reverse osmosis concentrated water reached 91%.

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Abstract

The invention belongs to the technical field of water treatment, and provides a method for reverse osmosis concentrated water by using an electrochemical water treatment device aiming at the problems of large occupied area, low filling density and low filtering efficiency of the device in the existing conductive filter membrane water treatment technology. The method comprises the following steps: mixing reverse osmosis concentrated water with an advanced oxidation agent, injecting into an electrochemical water treatment device, fully aerating, diffusing on the surface of a membrane, generating free radicals or active substances by the advanced oxidation agent in a gap between an electrode net and a conductive filter membrane, and oxidizing and decomposing macromolecular organic pollutants into micromolecular pollutants; the treated reverse osmosis concentrated water passes through a conductive filter membrane, is accumulated in a flow guide bag, and flows out of a membrane assembly along a structural gap of a runner spacer under the pressure of a water outlet peristaltic pump; the electrochemical water treatment device comprises a cylindrical shell, a winding type membrane assembly and an aeration device. The device disclosed by the invention is small in occupied area, high in filling density and capable of quickly degrading refractory organic matters in a continuous circulation mode and reducing membrane pollution.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for treating reverse osmosis concentrated water by utilizing an electrochemical water treatment device. Background technique [0002] The pesticide wastewater produced by the pesticide industry contains a large amount of refractory organic matter and salts. At present, many enterprises use the double-membrane method (ultrafiltration + reverse osmosis) to treat the generated pesticide wastewater. The resulting high-salt concentrated water uses evaporative crystallization methods for water resource recovery and separation, treatment and disposal of dissolved salt solids. However, the reverse osmosis concentrate of pesticide wastewater contains pollutants such as organophosphorus and benzene. The residue of these organic pollutants causes the solid salt after crystallization to turn yellow and black, and can only be disposed of as hazardous waste. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72B01D63/10C02F101/30
CPCC02F1/46114C02F1/725B01D63/10C02F2001/46133C02F2001/46161C02F2101/30C02F2201/461C02F2201/4619C02F2305/023Y02A20/131
Inventor 初永宝马青峰张静怡马宇歌王燕
Owner QINGDAO UNIV OF SCI & TECH
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