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Electrochemical device for wastewater treatment and method for treating wastewater by using same

A wastewater treatment and electrochemical technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of expensive ion-exchange membranes, low efficiency, unsuitable for advanced sewage treatment, etc. Achieve the effect of reducing energy consumption, improving degradation efficiency and reducing processing time

Inactive Publication Date: 2011-02-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The electrodialysis or reverse osmosis technology used in the drinking water system is not suitable for the advanced treatment of sewage due to its low efficiency and the use of expensive ion exchange membranes

Method used

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  • Electrochemical device for wastewater treatment and method for treating wastewater by using same
  • Electrochemical device for wastewater treatment and method for treating wastewater by using same
  • Electrochemical device for wastewater treatment and method for treating wastewater by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] as attached figure 1 As shown, the electrochemical device of the present invention is composed of power supply, primary electrolytic cell B, electrolytic cell A, electrolytic cell C, cathode, permeable isolation material part, anode, raw water pool, purified water collector and concentrated solution collection pool. Each of the electrolyzers includes a rectangular tank body made of phenolic resin, reticulated (rhombic size, 12.5 × 4.5mm) Ti-IrO 2 (The substrate is Ti, the coating is 20-50μm thick IrO 2 ) anode, copper-based alloy plate (copper 64.5%-66.5%, nickel 16.5%-18.5%, the balance is zinc) cathode and permeable isolation material with a thickness of 0.1mm nylon cloth. , its electrode area is 238cm 2 (14cm×17cm), the electrode spacing is 8mm. Using a DC power supply produced by Shanghai Wenbo Electric Co., Ltd., apply a DC current between the anode and the cathode with a current density of 5mA / cm 2 .

[0079] The raw material solution is a self-prepared sodiu...

Embodiment 2

[0084] In this example, nitrate in water was removed in the same manner as in Example 1, but the current density was changed. In this embodiment, the current density of primary electrolyzer B is 40mA / cm 2 , the current density of electrolytic cell A is 80mA / cm 2 , the current density of electrolytic cell C is 20mA / cm 2 After 10 minutes, the nitrate concentration of the water body in the Yin and Yang areas of each electrolytic cell was measured, and the test results are shown in Table 2.

[0085] Table 2: Nitrate concentration in the water body in the cathode and anode areas of each electrolyzer

[0086]

[0087] It can be seen that with the increase of the current density, the concentration of nitrate nitrogen can be reduced to below 1ppm, and the concentration of the anode area can be concentrated to 160ppm, but the high current density will lead to increased energy consumption.

Embodiment 3

[0089] as attached figure 2 As shown, five electrolyzers are used in combination, that is, a primary electrolyzer B, electrolyzers A1 and A2, and electrolyzers C1 and C2.

[0090] The water flowing out from the anode area of ​​the primary electrolytic cell B enters from the bottom of the cathode area of ​​the electrolytic cell A1, and then flows out from the top of the anode area and the cathode area respectively; the water flowing out from the top of the cathode area of ​​the electrolytic cell A1 returns to the raw water pool 2 for circulation Electrolysis; the water body flowing out from the top of the anode area of ​​electrolytic cell A1 enters the bottom of the cathode area of ​​electrolytic cell A2, and then flows out from the top of its anode area and cathode area; the water body flowing out from the top of the cathode area of ​​electrolytic cell A2 enters the bottom of the cathode area of ​​electrolytic cell A1; The water flowing out from the top of the anode area of ​...

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Abstract

The invention relates to an electrochemical device for wastewater treatment and a method for treating wastewater by using the same. The electrochemical device consists of a power supply, a primary electrolytic bath B, an electrolytic bath A, an electrolytic bath C, a cathode, a permeable isolation material part, an anode, a raw water tank, a purified water collector and a concentrated solution collecting tank. The electrochemical device can simultaneously remove common negative ions such as nitrate radicals, phosphate radicals, chloride ions, fluorine ions and the like and organic substances, does not need to add any agent, can avoid second pollution to the effluent, is convenient to operate, and has high treatment efficiency and low energy consumption.

Description

【Technical field】 [0001] The invention belongs to the technical field of wastewater treatment. More specifically, the present invention relates to an electrochemical device for wastewater treatment, and also to a method of treating wastewater using the device. 【Background technique】 [0002] At present, the effluent water quality indicators obtained by the conventional treatment of sewage treatment plants have reached the harmless discharge standards such as total nitrogen <35ppm, COD <50ppm, total phosphorus <10ppm, and suspended solids <30ppm. There is still a big gap in resource utilization such as irrigation and river and lake replenishment. The main reason is firstly that the content of total nitrogen and total phosphorus is still high, leading to prominent eutrophication of water quality, prone to a series of problems such as blooms and odors; secondly, common anions such as fluorine, chlorine and bromine in water are difficult to remove . In order to me...

Claims

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Application Information

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IPC IPC(8): C02F1/461
Inventor 万平玉李天玉孙艳芝李敏关晶刘操陈咏梅
Owner BEIJING UNIV OF CHEM TECH
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