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 the problems of reducing the efficiency of electro-oxidation current, easily generating oxygen and chlorine, and reduce the cost , reduce processing costs, and simplify the effect of connecting lines

Active Publication Date: 2012-11-14
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

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
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Example Embodiment

[0043] Example 1

[0044] The biochemical effluent treatment of a fine chemical plant, the realization method:

[0045] The actual electrolytic cell diagram is as Figure 1-Figure 4 As shown,

[0046] The electrolytic cell uses titanium-based lead dioxide composite electrode plates as both anode and cathode plates. The composite electrode plates are arranged in sequence to form a number of cell units. The anode and the cathode of the adjacent composite electrode plates are opposed to each other, and 7 composite electrodes are spaced apart. The plate is provided with a baffle with a gap left on the wall of the electrolytic cell, and every two adjacent baffles are staggered with the gap left on the wall of the electrolytic cell. A water inlet is provided above one end of the electrolytic cell, and the other end A water outlet is provided below the composite electrode plate, the composite electrode plate is made of a titanium-based lead dioxide anode plate and a titanium plate cathode...

Example Embodiment

[0050] Example 2:

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

[0052] The water quality of the biochemical tail water of a textile printing and dyeing company is: conductivity 14.33ms / cm, salinity 7.36g / L, ammonia nitrogen 162mg / L, pH6.8, COD 650mg / L, color 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 of Table 1 and Table 2 show that the current density is 15mA / cm 2 Under the suitable treatment conditions, the wastewater has a hydraulic retention time of 1h, and the effluent COD and ammonia nitrogen can both meet the nanotube standard. The electrocatalytic oxidation method involved in the present invention is suitable for the advanced treatment of industrial wastewater biochemical effluent.

[0056] In summ...

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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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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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