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Multi-stage treatment process for electroplating wastewater of centralized park zone

A technology for electroplating wastewater and treatment process, which is applied in the fields of metallurgical wastewater treatment, neutralization water/sewage treatment, water/sewage treatment, etc. It can solve the problems of failing to meet the national discharge standard and being practical, and achieve the effect of ensuring the compliance rate.

Inactive Publication Date: 2008-10-22
JIANGSU GOLDEN KYLIN ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the particularity of electroplating wastewater in centralized parks in terms of composition, management, and water quality concentration compared with single electroplating wastewater, it is not practical to adopt the above-mentioned primary treatment process (adjustment, reaction, separation) and it will not meet the national discharge standards.

Method used

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  • Multi-stage treatment process for electroplating wastewater of centralized park zone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] On April 27, 2005, the electroplating wastewater (except cyanide-containing and oil-containing wastewater) discharged from each factory entered the comprehensive wastewater regulating tank for treatment. The process steps are as follows:

[0025] 1. First-order reaction: The PH value of the comprehensive wastewater is 5.3, and the concentration of heavy metal ions is: Cr 6+ -35mg / L, Cu 2+ -24.3mg / L, Ni 2+ -16.8mg / L. Use the automatic dosing system to automatically add hydrochloric acid to the wastewater (the ratio of hydrochloric acid addition is based on the pH value in the wastewater), and adjust the pH value of the water to 2.97; add sulfuric acid to the pipeline mixer at 13 times the concentration of chromium ions (455mg / L) Ferrous, then the wastewater enters the reaction tank, and the automatic dosing system is used to add sodium hydroxide to the wastewater to adjust the pH of the wastewater to 8.9. After the wastewater is fully mixed and reacted by hydraulic st...

Embodiment 2

[0032] On May 16, 2005, the electroplating wastewater (except cyanide-containing and oil-containing wastewater) discharged from each factory entered the comprehensive wastewater regulating tank for treatment. The process steps are as follows:

[0033] 1. First-order reaction: The automatic dosing system is used to automatically add sodium hydroxide to the wastewater (the ratio of sodium hydroxide addition is based on the pH value in the wastewater). After testing, the pH value of the comprehensive wastewater is: 2.8, and the concentration of heavy metal ions is: Cr 6+ -44mg / L, Cu 2+ -42.6mg / L, Ni 2+ -53.5mg / L. Add ferrous sulfate to the pipeline mixer at 14.5 times (638 mg / L) the concentration of chromium ions, then the wastewater enters the reaction tank, and the pH value in the wastewater is adjusted to 8.4 by adding sodium hydroxide to the wastewater by using the automatic dosing system. After the wastewater is fully mixed and reacted for 23 minutes by hydraulic agitation...

Embodiment 3

[0039] On June 23, 2005, the electroplating wastewater (except cyanide-containing and oil-containing wastewater) discharged from each factory entered the comprehensive wastewater regulating tank for treatment. The process steps are as follows:

[0040] 1. Primary reaction: The automatic dosing system is used to automatically add sodium hydroxide to the wastewater (the ratio of sodium hydroxide is based on the pH value in the wastewater). After testing, the pH value in the comprehensive wastewater is: 1.8, and the concentration of heavy metal ions is: Cr 6+ -72.8mg / L, Cu 2+ -72.6mg / L, Ni 2+ -123.5mg / L. Add ferrous sulfate to the pipeline mixer at 16 times (1164.8mg / L) the concentration of chromium ions, then the wastewater enters the reaction tank, and the pH value of the wastewater is adjusted to 8.3 by adding sodium hydroxide to the wastewater by using the automatic dosing system . The wastewater is fully mixed and reacted for 25 minutes by hydraulic agitation in the react...

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Abstract

The invention relates to a multistep treatment technique for electroplated sewage in centralized park. Wherein, adjusting the sewage and leading into reaction pond to stir and react; in solid-liquid separator, taking the first-step reaction and forcing the supernatant into the second-step reaction pond; adding catching and precipitating agent for heavy metal ion or NaOH or Na2S as well as polyaluminium chloride and polyacrylamide to stir evenly and solid-liquid separate; using quartz sand to filter minim suspension, then discharging or recovering. This invention can ensure the sewage come up to the standard at maximum limit.

Description

technical field [0001] The invention relates to a multi-stage treatment process for electroplating wastewater in a centralized park, specifically for the treatment of electroplating wastewater in a concentrated park, and belongs to the technical field of sewage treatment. Background technique [0002] With the development of my country's electroplating industry, the pollution problem is becoming more and more serious. The annual discharge of electroplating wastewater is about 400 million tons, and a large amount of toxic and harmful cyanide and heavy metal ions in the sewage have caused great harm to the environment. The dispersion of electroplating enterprises It also led to an increase in pollution sources. Therefore, the concentration of electroplating enterprises has become an inevitable trend, and the centralized discharge and centralized treatment of electroplating wastewater have also occurred accordingly. The centralized discharge of electroplating wastewater has brou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66C02F1/62C02F103/16
Inventor 安翔
Owner JIANGSU GOLDEN KYLIN ENVIRONMENTAL TECH
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