Method for treating industrial waste water with high sulfur content

A technology with high sulfur content in industrial wastewater, applied in the direction of oxidized water/sewage treatment, electrochemical water/sewage treatment, etc., can solve the problems that biological oxidation method is not suitable

Inactive Publication Date: 2003-02-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

According to the information, when the sulfur content is 100mg / l, the methane process is inhibited, and if it exceeds 200mg / l, the inhibitory effect is very obvious. Other forms of sulfur compounds (such as SO 2 , S 4 2- etc.) also inhibit the anaerobic process, so the biological oxidation method is not suitable for the follow-up treatment technology of wet air oxidation technology to treat wastewater with high sulfur content

Method used

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Examples

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Effect test

Embodiment 2

[0009] Through the combination of wet air oxidation and electroheterogeneous catalytic oxidation, the total COD removal rate of wastewater can reach about 91.0%. Example 2 Treatment effect of wet air oxidation and electroheterogeneous catalytic oxidation combined technology on high sulfur wastewater

[0010] After the above wastewater was diluted 1:2, the COD value of the wastewater was 40339 mg / l, and the pH was 9. At 6.6MPa, 265°C, and space velocity 1.0 -1 , Gas / H 2 Under the reaction condition of O(body)=200, after two-stage wet air oxidation treatment, the COD value of the wastewater is 9261mg / l, the pH is 6.5, and the COD removal rate is 77.1%.

[0011] The wastewater pretreated by wet air oxidation is then treated by electroheterogeneous catalytic oxidation. The reaction conditions of electroheterogeneous catalytic oxidation are current: 2.2A; voltage: 6V; To 3343mg / l, COD removal rate of 68.2%. It can be seen that increasing the treatment time of electroheterogene...

proportion example 1

[0013] Proportional example 1 Direct treatment of wastewater by electroheterogeneous catalytic oxidation

[0014] Dilute the above wastewater by 1:5, the COD value of the diluted wastewater is 20809 mg / l, and it is directly treated by electroheterogeneous catalytic oxidation. The reaction conditions of electroheterogeneous catalytic oxidation, current: 2.2A; voltage: 6V; To be 9160mg / l, although the COD removal rate can also reach 56.2%, but the electrodes in the electric heterogeneous catalytic oxidation reaction device have serious corrosion phenomenon.

[0015] Therefore, the use of electroheterogeneous catalytic oxidation cannot directly treat wastewater that has not been pretreated. Comparative example 2 The wet air oxidation process treats the waste water separately

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Abstract

The method for treating high sulfur content and high concentration organic waste water produced in industrial process includes wet oxidation and electric multiphase catalytic oxidation. Firstly, the diluted said waste water is undergone the pretreatment by using wet air oxidation method, under the condition of that reaction temp. is 255-260 deg.C, reaction pressure is 6.6-7.0 MPa and space velocity is 1.0-1.3 hr.(-1) the removing rate of COD can be up to 74-76%, then the pretreated waste water is undergone the process of after treatment by adopting electric multiphase catalytic oxidation, under the reaction condition of that electric current is 1.0-2.5A, voltage is 6-12V and treatment time is 1-7 hr. the removing rate of COD can be up to 60-68%. After treatment by adopting the above-mentioned two methods the total removing rate of COD can be up to 89.2%-92.3%.

Description

technical field [0001] The present invention provides a method for treating industrial waste water, in particular, a method for treating organic waste water with high sulfur content, which uses wet oxidation and electroheterogeneous catalytic oxidation combined technology to treat chemical auxiliary waste water . This technological process is also suitable for treating similar industrial waste water. Background technique [0002] At present, in the industry, wet oxidation method is mainly used as the pretreatment technology for industrial wastewater treatment, followed by biological oxidation method as post-treatment. This is because although the wet oxidation technology has a high treatment efficiency for industrial wastewater, when treating high-concentration organic wastewater, the initial stage of the reaction is due to the high concentration of reactants, the oxidation speed is fast, and the COD removal efficiency is relatively fast. The concentration of the pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/72C02F1/74
Inventor 孙承林杨民王贤高谢茂松徐桂芬杨旭
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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