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Method for treating chrome tanning wastewater through composited flocculation method and chelation method

A chrome tanning and waste water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of fast settling speed and wide adaptability

Inactive Publication Date: 2014-04-02
SHANDONG HUASHENG CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its production cost is relatively high, and the synthetic organic polymer flocculant is highly toxic due to the residual monomer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of compound flocculation of the present invention - the method for chelation processing chrome tanning waste water, steps are as follows:

[0024] (1) Take the reduced chrome tanning wastewater, add flocculant, adjust pH=10, stir magnetically for 15 minutes, and stir magnetically; the weight ratio of the flocculant components is: PAC:PFS:CPAM=8:6:9.

[0025] (2) Let stand for 5 hours, adjust the pH to 6.5-10.0;

[0026] (3) Add a chelating agent, apply a magnetic force for 10 minutes, let stand for 24 hours, and then filter. Each component in the chelating agent is by mass ratio: EDTA: C 3 h 5 ClO:NaOH:CS2 =11:32:6:0.8.

[0027] The residual concentration of Cr(Ⅲ) in the supernatant was measured by spectrophotometry, and the chromium removal was calculated to be 99.95%.

Embodiment 2

[0029] A kind of compound flocculation of the present invention - the method for chelation processing chrome tanning waste water, steps are as follows:

[0030] (1) Take the reduced chrome tanning wastewater, add flocculant, adjust pH=10, stir magnetically for 15 minutes, and stir magnetically; the weight ratio of the flocculant components is: PAC:PFS:CPAM=10:3:7.

[0031] (2) Let stand for 5 hours, adjust the pH to 6.5-10.0;

[0032] (3) Add a chelating agent, apply a magnetic force for 10 minutes, let stand for 24 hours, and then filter. Each component in the chelating agent is by mass ratio: EDTA: C 3 h 5 ClO:NaOH:CS2 =15:25:5:2.

[0033] The residual concentration of Cr(Ⅲ) in the supernatant was measured by spectrophotometry, and the chromium removal rate was calculated to be 99.86%.

Embodiment 3

[0035] A kind of compound flocculation of the present invention - the method for chelation processing chrome tanning waste water, steps are as follows:

[0036] (1) Take the reduced chrome tanning wastewater, add flocculant, adjust pH=10, stir magnetically for 15 minutes, and stir magnetically; the weight ratio of the flocculant components is: PAC:PFS:CPAM=4:3:8.

[0037] (2) Let stand for 5 hours, adjust the pH to 6.5-10.0;

[0038] (3) Add a chelating agent, apply a magnetic force for 10 minutes, let stand for 24 hours, and then filter. Each component in the chelating agent is by mass ratio: EDTA: C 3 h 5 ClO:NaOH:CS2 =5:35:7:0.5.

[0039] The residual concentration of Cr(Ⅲ) in the supernatant was measured by spectrophotometry, and the chromium removal rate was calculated to be 99.79%.

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Abstract

The invention discloses a method for treating chrome tanning wastewater through a composited flocculation method and a chelation method, wherein the composited flocculation method and the chelation method are combined to treat the chrome tanning wastewater, so that the treated chrome tanning wastewater can be recycled. The method for treating the chrome tanning wastewater through the composited flocculation method and the chelation method has the advantages of low investment and cost, high efficiency, simple equipment and operation, and space saving, and treated chrome tanning wastewater is better than the chromium chrome tanning in the emission standard.

Description

technical field [0001] The invention relates to the technical field of chrome tanning wastewater treatment, in particular to a method for treating chrome tanning wastewater by a composite flocculation-chelation method. Background technique [0002] The chromium-containing wastewater produced by chrome tanning in the leather industry has the characteristics of large discharge and high chromium content. The treatment of chrome tanning wastewater is an urgent problem to be solved. The treatment methods of chromium-containing wastewater at home and abroad mainly include alkali precipitation method, ion exchange method, electrolysis method, adsorption method, etc., using these methods to treat chromium-containing wastewater can not fully meet the discharge standards, but can only reduce chromium pollution. Chromium belongs to the first category of pollutants listed in the "Comprehensive Wastewater Discharge Standard" that can accumulate in the environment and human body and have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/22
Inventor 胡康张佳傅春芳马学军
Owner SHANDONG HUASHENG CHEM TECH
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