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Method and process system for innocuous treatment of high-salt and high-COD waste alkali liquid

A technology for harmless treatment and waste lye, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc. It can solve the problems of poor device operation and poor effluent quality, and achieve low-investment operation. cost, improve water quality, and increase the effect of efficient operation time

Inactive Publication Date: 2017-04-26
SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This traditional method requires strict quality of influent water and few suitable water samples. When dealing with waste lye with complex impurity components, it is prone to poor operation of the device and poor quality of effluent water.

Method used

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  • Method and process system for innocuous treatment of high-salt and high-COD waste alkali liquid
  • Method and process system for innocuous treatment of high-salt and high-COD waste alkali liquid
  • Method and process system for innocuous treatment of high-salt and high-COD waste alkali liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 , as shown in 2, a high-salt and high-COD waste lye harmless treatment system includes a pretreatment pool 1, a COD removal unit 2 and a first desalination device 3, the pretreatment pool 1 and the COD removal unit 2 connected, the COD removal unit 2 is connected with the first desalination device 3;

[0034] The COD removal unit 2 includes an interconnected COD removal reactor 2-1 and a clarification tank 2-2, and the COD removal reactor 2-1 is provided with a modular catalyst 2-3 and an aeration pipe 2-4 ; The COD removal reactor 2-1 is connected to the pretreatment pool 1, and the clarification tank 2-2 is connected to the desalination device 3. The modular catalysts 2-3 are evenly distributed in the cubic grid module, and the catalytic reaction process is combined with aeration or stirring measures, which can increase the reaction rate and make the reaction points evenly distributed.

Embodiment 2

[0036] A method for harmless treatment of high-salt and high-COD waste lye, comprising using the system described in Example 1, the steps are as follows:

[0037] The waste lye raw water (COD content is 23000ppm, inorganic salt content is 5%) enters the pretreatment tank 1 and adds a neutralizer (31% hydrochloric acid) to adjust the pH of the waste lye to 2, and the pretreated waste liquid enters the COD for removal Unit 2, the modular catalyst 2-3 in COD removal unit 2 is activated carbon, and the amount of catalyst added is 2m 3 / (m 3 Waste lye), under aeration condition, 10~40 ℃, catalytic reaction 2h, remove most of COD waste liquid (COD content ≤ 70ppm) and send to the first desalination device 3. In the first desalination device 3, the waste liquid is evaporated by steam heating at 115°C. The COD of the wastewater flowing out from the desalination device 3 is reduced to 38ppm, and the content of inorganic salt is ≤200ppm.

Embodiment 3

[0039] A method for harmless treatment of high-salt and high-COD waste lye, comprising using the system described in Example 1, the steps are as follows:

[0040] Waste lye raw water (COD content is 11000ppm, inorganic salt content is 13%) enters pretreatment pool 1 and adds neutralizer (20wt% sulfuric acid) to adjust waste lye pH to 5, and waste liquid after pretreatment enters COD to remove Unit 2, the modular catalyst 2-3 in COD removal unit 2 is aluminum powder, and the amount of catalyst added is 1.5m 3 / (m 3 Waste lye), under aeration conditions, 10-40°C, catalytic reaction for 1.5h, and the waste liquid (COD content ≤ 60ppm) with most of the COD removed is sent to the first desalination device 3 . In the first desalination device 3, the waste liquid is evaporated by steam heating at 105°C. The COD of the wastewater flowing out from the first desalination device 3 is reduced to 30ppm, and the content of inorganic salt is ≤200ppm.

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Abstract

The invention discloses a method and a process system for innocuous treatment of high-salt and high-COD waste alkali liquid. The method includes the steps of: adding a neutralizer to pre-treat the high-salt and high-COD waste alkali liquid, wherein the pH of the treated waste alkali liquid is 2-8; adding a catalyst to perform a catalytic reaction under an aeration or a stirring condition to remove COD in the waste alkali liquid; and performing evaporating desalination to the waste alkali liquid to complete the treatment. The method has lower requirement on the quality of the waste alkali liquid and can be used for treating the waste alkali liquid well even inorganic salt content reaches 20% and COD content reaches 10%. The method has more environment-friendly treatment process and is free of addition of microorganisms. The treated liquid is not more than 45 ppm in COD content and is not more than 200 ppm in inorganic salt content.

Description

technical field [0001] The invention relates to a method and a process system for treating waste lye, in particular to a method and a process system for harmless treatment of high-salt and high-COD waste lye, belonging to the technical field of chemical waste treatment. Background technique [0002] The current environmental protection situation is becoming increasingly severe, and environmental protection issues have become a hot issue of public concern. The discharge of sewage in industrial enterprises has long been a rigid indicator for the survival of enterprises. However, sewage treatment in various industries is difficult, costly, and difficult to meet the standards, which gradually restricts the survival and development of enterprises. Waste lye produced in chemical, pharmaceutical, petrochemical and other industries is quite representative. [0003] Chinese patent document CN203144221U (application number: 201320153778.7) discloses a recycling treatment system for w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/048C02F1/66C02F1/725C02F9/00
Inventor 张秀伸
Owner SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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