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Method for treating chrome plating wastewater by flocculant

A flocculant and waste water technology, applied in flocculation/sedimentation water/sewage treatment, metallurgical waste water treatment, etc., can solve the problems of incomplete discharge, low treatment efficiency, secondary pollution, etc., and achieve good water purification effect and water quality. The effect of low temperature and low processing cost

Inactive Publication Date: 2014-03-26
SHANDONG HUASHENG CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have certain effects, there are problems such as low treatment efficiency, large investment, possible secondary pollution and failure to fully meet the discharge standards to varying degrees.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0015] Make PAFS into a 60g / L flocculant solution, add it to the chrome-plating wastewater, react for 15 minutes, and let it stand for 12 hours.

[0016] In the experiment, the treated chrome-plating wastewater was left to stand for 12 hours and then centrifuged at a low speed. The amount of sediment was obtained by subtraction, and the supernatant was taken, and its absorbance was measured with a 7230G spectrophotometer (Shanghai Precision Scientific Instrument Co., Ltd.) to determine the effect of the flocculant. Chromium removal in wastewater;

[0017] The calculated removal rate of chromium was 99.92%.

[0018] Example 2

Embodiment 2

[0020] Make PAFS into a 40g / L flocculant solution, add it to the chrome-plating wastewater, react for 15 minutes, and let it stand for 12 hours.

[0021] In the experiment, the treated chrome-plating wastewater was left to stand for 12 hours and then centrifuged at a low speed. The amount of sediment was obtained by subtraction, and the supernatant was taken, and its absorbance was measured with a 7230G spectrophotometer (Shanghai Precision Scientific Instrument Co., Ltd.) to determine the effect of the flocculant. Chromium removal in wastewater;

[0022] The calculated removal rate of chromium was 99.88%.

[0023] Example 3

Embodiment 3

[0025] Make PAFS into 80g / L flocculant solution, add it into chrome plating wastewater, react for 15min, and let stand for 12 hours.

[0026] In the experiment, the treated chrome-plating wastewater was left to stand for 12 hours and then centrifuged at a low speed. The amount of sediment was obtained by subtraction, and the supernatant was taken, and its absorbance was measured with a 7230G spectrophotometer (Shanghai Precision Scientific Instrument Co., Ltd.) to determine the effect of the flocculant. Chromium removal in wastewater;

[0027] The calculated removal rate of chromium is 99.85%.

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PUM

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Abstract

The invention discloses a method for treating chrome plating wastewater by a flocculant. The chrome plating wastewater is taken and is added with the flocculant PAFS (Polymeric Aluminum Ferric Sulfate); after the reaction is performed for 15min, standing is carried out for 12 hours, wherein the mass ratio of Fe to Al in the PAFS is 7 to 13. The method for treating the chrome plating wastewater, disclosed by the invention, has the advantages that the purposes of broad spectrum and low toxicity are realized, the adopted raw materials are cheap, the treatment effect is good, and the operation is simple.

Description

technical field [0001] The invention relates to a chrome-plating wastewater treatment technology, in particular to a method for treating chrome-plating wastewater with a flocculant. Background technique [0002] The wastewater produced by electroplating enterprises has the characteristics of high toxicity, persistence, serious pollution and poor degradation. Electroplating wastewater is the main source of heavy metal pollution. Chromium in chrome-plating wastewater mainly exists in the form of Cr(III) and Cr(VI), of which Cr(VI) is the most toxic, about 100 times that of Cr(III), and chromium pollution will occur in Accumulation in water bodies and organisms. According to the GB8978-1996 standard, the maximum discharge concentration of total chromium is 1.5mg / L, Cr 6+ The maximum allowable emission concentration is 0.5mg / L. There are many methods to control chromium pollution at home and abroad, mainly including ion exchange method, electrolytic reduction method, adsorpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F103/16
Inventor 马学军胡康张佳
Owner SHANDONG HUASHENG CHEM TECH
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