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Zero-discharge high-COD (chemical oxygen demand) wastewater treatment process

A treatment process and zero-discharge technology, applied in the field of water pollution treatment, can solve the problem of difficult discharge or reuse of water quality standards, and achieve the effect of large promotion and application value, improvement of removal efficiency, and simple process.

Inactive Publication Date: 2018-12-21
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only a single pretreatment for high COD wastewater is difficult to achieve water quality discharge or reuse. Therefore, the use of multi-effect combined process is the most efficient treatment plan to achieve efficient purification of high COD wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] To treat a certain pesticide wastewater in Yangzhou, the treatment process is as follows:

[0026] 1. Preprocessing unit

[0027] The high COD wastewater passes through the flocculation and sedimentation pretreatment device to pretreat the suspended solids, colloids, and refractory organic matter in the wastewater. Throw liquid PAC flocculant with a solid content of 3% into the settling tank, the volume ratio of liquid PAC to wastewater is 0.006:1, the flocculant is placed in the wastewater tank through the pipeline diffusion mixer, and stirred for 1~3min to make the agent and wastewater Fully mixed and allowed to settle;

[0028] 2. Enhanced processing unit

[0029] High COD wastewater enters the pH adjustment tank after passing through the flocculation and sedimentation pretreatment unit, and then enters the advanced oxidation treatment unit after the pH of the adjustment system is >3. This enhanced treatment unit mainly uses photoelectric Fenton to efficiently degr...

Embodiment 2

[0034] To treat RO concentrated water in Shenzhen, the treatment process is as follows:

[0035] 1. Preprocessing unit

[0036] The high COD wastewater passes through the flocculation and sedimentation pretreatment device to pretreat the suspended solids, colloids, and refractory organic matter in the wastewater. Add liquid PAC flocculant with a solid content of 3% to the settling tank. The volume ratio of liquid PAC to wastewater is 0.01:1. Fully mixed and allowed to settle;

[0037] 2. Enhanced processing unit

[0038] High COD wastewater enters the pH adjustment tank after passing through the flocculation and sedimentation pretreatment unit, and then enters the advanced oxidation treatment unit after the pH of the adjustment system is >3. This enhanced treatment unit mainly uses photoelectric Fenton to efficiently degrade refractory organic pollutants in water. In the electrolytic cell, high-purity graphite carbon rod electrodes are used as the cathode and anode, the con...

Embodiment 3

[0043] To treat a certain pesticide wastewater in Dalian, the treatment process is as follows:

[0044] 1. Preprocessing unit

[0045] The high COD wastewater passes through the flocculation and sedimentation pretreatment device to pretreat the suspended solids, colloids, and refractory organic matter in the wastewater. Add a liquid PAC flocculant with a solid content of 2% to the settling tank. The volume ratio of the liquid PAC to the wastewater is 0.008:1. Fully mixed and allowed to settle;

[0046] 2. Enhanced processing unit

[0047] High COD wastewater enters the pH adjustment tank after passing through the flocculation and sedimentation pretreatment unit, and then enters the advanced oxidation treatment unit after the pH of the adjustment system is >3. This enhanced treatment unit mainly uses photoelectric Fenton to efficiently degrade refractory organic pollutants in water. In the electrolytic cell, high-purity graphite carbon rod electrodes are used as the cathode ...

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Abstract

The invention relates to a zero-discharge high-COD (chemical oxygen demand) wastewater treatment process. Wastewater sequentially passes through a flocculating settling pretreatment unit, a photoelectric Fenton advanced oxidation-reinforced treatment unit and a ceramic membrane filtration and recycling unit, the pretreatment unit, the reinforced treatment unit, and the filtration and recycling unit are specifically included, the wastewater which undergoes photoelectric Fenton-reinforced treatment passes through a ceramic membrane filter, the filtration and recycling unit is a dynamic filtration unit, which adopts an inorganic ceramic membrane with the average pore size of 1.0 Mu m as a filtration medium, pressure filtration is carried out for the passing wastewater by regulating filtrationoperation pressure and filter rotation speed, and effluent can come up to the recycling or direct discharge standard. By adopting the flocculating settling-photoelectric Fenton oxidation-ceramic membrane filtration integrated technology, the zero-discharge high-COD wastewater treatment process can effectively remove organic pollutants in wastewater, realizing zero wastewater discharge, moreover,the process is simple, and the popularization and application value is high.

Description

technical field [0001] The invention relates to a treatment process for zero discharge of high COD wastewater, which can realize the standard treatment of high COD wastewater and is used in the field of water pollution treatment. Background technique [0002] High COD wastewater mainly comes from the chemical industry. As a traditional industry in my country, it occupies an important position in the national economy. However, with the development of the chemical industry, the ecological environment has also been impacted. The chemical wastewater produced by it has high COD concentration, high toxicity, and poor biodegradability. It is difficult for ordinary treatment processes to achieve the expected treatment effect. [0003] The traditional treatment methods for high-concentration COD wastewater mainly include biochemical methods, adsorption methods, oxidation methods, and incineration methods. Most of them have defects such as high operating costs, long treatment cycles, ...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F101/30
CPCC02F1/001C02F1/32C02F1/46104C02F1/46109C02F1/4672C02F1/5281C02F1/66C02F1/722C02F1/725C02F1/74C02F9/00C02F2001/007C02F2101/30C02F2209/08C02F2209/10C02F2301/08C02F2305/026C02F2305/10
Inventor 何丹农童琴赵昆峰代卫国金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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