Treatment method for chromium-containing wastewater

A treatment method and technology for chromium wastewater, applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Manage easy effects

Inactive Publication Date: 2014-09-10
LIDA ENVIRONMENT ENG DALIAN ECONOMIC TECH DEV ZONE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Chromium-containing wastewater contains highly toxic hexavalent chromium, if it is di

Method used

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Embodiment Construction

[0010] The present invention is a method for treating chromium-containing wastewater, comprising the following steps:

[0011] a. Add acid to the chromium-containing wastewater, and adjust the pH to between 2 and 3;

[0012] b. Add a reducing agent to the acidic chromium-containing wastewater to reduce hexavalent chromium ions to trivalent chromium ions. The reducing agent can be SO 2 or FeSO 4 or Na 2 SO 3 or NaHSO 3 or Fe;

[0013] c. Adding alkali to the solution treated in step b, adjusting the pH to 8-9, converting trivalent chromium ions into chromium hydroxide precipitates, thereby removing chromium ions.

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Abstract

The invention discloses a treatment method for chromium-containing wastewater. The method comprises the steps of: a. adding acid into the chromium-containing wastewater to adjust the pH to 2-3; b. adding a reducing agent into the acidic chromium-containing wastewater to reduce hexavalent chromium ions to trivalent chromium ions; and c. adding alkali into the solution treated in step b to adjust the pH to 8-9, and converting the trivalent chromium ions into chromium hydroxide precipitates. The method provided by the invention has the characteristics of: small investment, low operation cost, good treatment effect, and simple operation and management.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a chromium-containing wastewater treatment method. Background technique [0002] As chromium-containing wastewater contains highly toxic hexavalent chromium, if it is discharged without treatment to meet the standard, it will cause great harm to the environment. Contents of the invention [0003] The object of the present invention is to overcome above-mentioned insufficient problem, a kind of chromium-containing wastewater treatment method is provided. [0004] The technical scheme that the present invention adopts for realizing the above object is: chromium-containing waste water treatment method, comprises the following steps: [0005] a. Add acid to the chromium-containing wastewater, and adjust the pH to between 2 and 3; [0006] b. Add a reducing agent to the acidic chromium-containing wastewater to reduce hexavalent chromium ions to trivalent chromium ions; [0007] c....

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/22
Inventor 唐立军刘东晓李秀婷袁刚孙德文毕义
Owner LIDA ENVIRONMENT ENG DALIAN ECONOMIC TECH DEV ZONE
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