Method for recycling high-salt organic wastewater

An organic wastewater and high-salt technology, which is applied in the field of high-salt organic wastewater recycling and high-salt organic wastewater recycling, can solve problems such as low efficiency of hydrogen peroxide oxidation, and achieve the improvement of oxidation reaction efficiency and reaction efficiency. The effect of speed increase and energy consumption reduction

Active Publication Date: 2019-08-23
NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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Problems solved by technology

[0008] Aiming at the problem of low hydrogen peroxide oxidation efficiency in the advanced oxidation of existing high-salt organic wastewater, the present invention provides a method for recycling high-salt organic wastewater. The dosing method has been improved to effectively improve the advanced oxidation efficiency of high-salt wastewater

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  • Method for recycling high-salt organic wastewater

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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a salt-containing organic wastewater of a chemical factory producing ethers in Jiangsu is selected, and the factory produces about 50,000 tons of sodium chloride-containing organic wastewater every year. After detection and analysis, the salt content of the wastewater was 16%, the pH of the wastewater was 11.2, and the organic matter content in the wastewater was 897mg / L in terms of COD;

[0035] In the first step, the wastewater directly enters the ozone oxidation, and according to the organic matter content of the wastewater in terms of COD, the mass concentration of O 3 : COD is 1:1 ozone amount, use steam to heat the pre-ozonation process to 50°C, after 2 hours of ozone oxidation, the pH of wastewater will drop to 6.8-7.0, and the COD will drop to 625mg / L.

[0036] In the second step, the wastewater enters the hydrogen peroxide oxidation, and the mass concentration of H 2 o 2 : COD is 5:1, under 200rpm stirring condition, steam heating ...

Embodiment 2

[0057] A salt-containing organic wastewater from a chemical plant producing 2-4D acid in Jiangsu was selected. The plant produces about 20,000 tons of sodium chloride-containing organic wastewater every year. After detection and analysis, the salt content of the wastewater is 21%, the pH of the wastewater is 6.84, and the organic matter content in the wastewater is 2525mg / L in terms of COD.

[0058] Wastewater enters into ozone oxidation, according to the organic matter content of the waste water, the amount of COD is added, and the mass concentration of O 3 :COD is 1.5:1 ozone amount, the ozone oxidation process is heated by steam to 60°C, after 1.5h of ozone oxidation, the pH of the wastewater is reduced to 4.36, and the COD is reduced to 1462mg / L.

[0059] Adjust the pH of the wastewater to 6.5-6.7, carry out hydrogen peroxide oxidation, and add mass concentration H 2 o 2 : COD is 1:1, under the condition of 300rpm stirring, steam heating temperature to 60 ℃ for 2h, COD d...

Embodiment 3

[0064] The salt-containing organic wastewater of a pharmaceutical intermediate enterprise in Jiangsu was selected. The factory produces about 10,000 tons of potassium chloride-containing organic wastewater every year. After detection and analysis, the salt content of the wastewater is 8%, the pH of the wastewater is 3.2, and the organic matter content in the wastewater is 4386 mg / L in terms of COD.

[0065] Wastewater enters into ozone oxidation, according to the organic matter content of the waste water, the amount of COD is added, and the mass concentration of O 3 : COD is 2:1 ozone amount, use steam to heat the ozone oxidation process to 40°C, after 0.5h of ozone oxidation, the pH of the wastewater becomes 3.9, and the COD drops to 2462mg / L.

[0066] Adjust the pH of the wastewater to 6.6-6.7, carry out hydrogen peroxide oxidation, and add mass concentration H 2 o 2 : COD is 2:1, under the condition of 250rpm stirring, steam heating temperature to 80 ℃ for 1h, COD drops t...

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Abstract

The invention discloses a method for recycling high-salt organic wastewater, and belongs to the technical field of environmental protection. The method comprises a step of oxidizing hydrogen peroxide,wherein the oxidation step sequentially comprises a first stage of adding hydrogen peroxide under a neutral condition, a second stage of carrying out heating and stirring for a reaction under a strong acid condition, and a third stage of adding hydrogen peroxide again under a weak acid condition. According to the invention, the pH is adjusted and the hydrogen peroxide is added in stages accordingto the reaction process in the hydrogen peroxide oxidation process, so that the problem of low removal rate of chemical oxygen demand (COD) in the high-salt organic wastewater is effectively solved,and oxidation efficiency of organic matter in the high-salt organic wastewater is improved.

Description

technical field [0001] The invention relates to the resource utilization technology of high-salt organic waste water in chemical industries such as pesticides, medicines and dyes, and belongs to the technical field of water treatment. More specifically, it relates to a method for recycling high-salt organic wastewater. Background technique [0002] One of the important sources of water pollution is industrial wastewater. The discharge of high-salt wastewater is increasing year by year. This type of wastewater has complex components, high toxicity, and strong acid or alkalinity, which has brought huge challenges to the current wastewater treatment and recycling. challenge. This kind of wastewater mainly comes from the production process of pesticide, chemical industry, medicine, printing and dyeing, coal chemical industry and other chemical industries; in addition, it also includes concentrated brine produced in other wastewater treatment processes such as nanofiltration, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/30
CPCC02F1/04C02F1/66C02F1/722C02F1/78C02F9/00C02F2101/30
Inventor 仇鑫陈利芳王炼戴建军李爱民周腾腾朱强
Owner NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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