Method for removing COD (chemical oxygen demand) and ammonia nitrogen from wastewater by using titanium-base lead peroxide composite electrode

A composite electrode and lead dioxide technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc., can solve problems such as easy generation of oxygen and chlorine, reduce electro-oxidation current efficiency, etc., to reduce treatment cost, cost reduction, and high efficiency

Active Publication Date: 2014-01-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ti / RuO 2 -IrO 2 The electrode is an oxygen and chlorine analysis electrode, which is easy to generate oxygen and chlorine gas, which reduces the current efficiency of electrooxidation

Method used

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  • Method for removing COD (chemical oxygen demand) and ammonia nitrogen from wastewater by using titanium-base lead peroxide composite electrode
  • Method for removing COD (chemical oxygen demand) and ammonia nitrogen from wastewater by using titanium-base lead peroxide composite electrode
  • Method for removing COD (chemical oxygen demand) and ammonia nitrogen from wastewater by using titanium-base lead peroxide composite electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Biochemical effluent treatment of a fine chemical plant, realized by:

[0045] The schematic diagram of the actual electrolyzer is as Figure 1-Figure 4 as shown,

[0046] The electrolytic cell uses a titanium-based lead dioxide composite electrode plate as an anode plate and a cathode plate, and the composite electrode plates are arranged in sequence to form several cell units. The anodes and cathodes of adjacent composite electrode plates are opposite, and each interval is 7 composite electrodes The plate is provided with a baffle plate with a gap left on the cell wall of the electrolytic cell, and every two adjacent baffles are staggered with the gaps left on the cell wall of the electrolytic cell. A water inlet is provided above one end of the electrolytic cell, and There is a water outlet below the bottom, the composite electrode plate is compositely made by sandwiching an insulating plate between the titanium-based lead dioxide anode plate and the titanium plate ...

Embodiment 2

[0051] The electrolytic cell is the same as in Example 1, except that the distance between the adjacent composite electrode plates is changed to 2 cm.

[0052] The biochemical tail water of a textile printing and dyeing company, the water quality is: conductivity 14.33ms / cm, salinity 7.36g / L, ammonia nitrogen 162mg / L, pH6.8, COD 650mg / L, chroma 500. The wastewater treatment process is the same as in Example 1, and the results are shown in Table 2.

[0053] Table 2 Water quality before and after treatment of printing and dyeing wastewater

[0054]

[0055] The results in Table 1 and Table 2 show that at a current density of 15mA / cm 2 Under certain treatment conditions, the hydraulic retention time of wastewater is 1 hour, and both effluent COD and ammonia nitrogen can meet the nanotube standard. The electrocatalytic oxidation method involved in the present invention is suitable for advanced treatment of industrial wastewater biochemical effluent.

[0056] In summary, the e...

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Abstract

The invention discloses a method for removing COD (chemical oxygen demand) and ammonia nitrogen from wastewater by using a titanium-base lead peroxide composite electrode. By using wastewater, of which the COD content is 500-1000 mg / L, the ammonia nitrogen content is 50-200 mg / L, the pH value is 6-9 and the chroma is 50-500, as an electrolyte, the wastewater flows into an electrolytic bath from the water inlet, flows through all tank units of the electrolytic bath in a plug-flow mode, and performs electrolytic reaction under the conditions that the current density is 5-15 mA / cm<2> and the hydraulic retention time is 30-120 minutes, thereby achieving the goals of electrocatalytic oxidation and wastewater COD and ammonia nitrogen removal at the same time. The titanium-base lead peroxide composite electrode plate is utilized to carry out the electrolytic catalytic oxidation reaction, thereby implementing synchronously oxidizing wastewater COD and ammonia nitrogen; and no chemical or biological reagent is needed in the reaction process, the wastewater retention time is short, the pollutant oxidation is thorough, no precipitate or sludge is generated, and the efficiency is high.

Description

(1) Technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for simultaneously removing COD and ammonia nitrogen in waste water by electrocatalytic oxidation of a titanium-based lead dioxide composite electrode, which is suitable for simultaneous removal of COD and ammonia nitrogen in industrial waste water. (2) Background technology [0002] COD and ammonia nitrogen removal technology has always been a focus in the field of industrial wastewater pollution control. The "National Environmental Protection "Twelfth Five-Year" Plan" also clearly defined the chemical oxygen demand (COD), ammonia nitrogen (NH 3 -N) Incorporated into the total control index system, during the "12th Five-Year Plan" period, COD and NH 3 The total emission reduction of -N reaches 5% and 10%, and "advanced treatment of refractory COD and stable removal technology of ammonia nitrogen" has become the main direction of special environmental protection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/72C02F1/58
Inventor 王家德陈建孟何旭斌杨初引陶建国苏建军陈飞翔
Owner ZHEJIANG UNIV OF TECH
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