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Sludge backflow and reduction method in electroplating wastewater treatment process

A technology of electroplating wastewater and sludge reflux, which is applied in metallurgical wastewater treatment, degassed water/sewage treatment, neutralized water/sewage treatment, etc. It can solve the problems of comprehensive utilization of secondary sludge and reduce sludge production , Solve the low utilization rate and ensure the effect of reasonable operation

Inactive Publication Date: 2020-04-21
ZHEJIANG HI TECH ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the process of engineering application, it is found that the sludge produced in the secondary reaction process contains a large amount of calcium carbonate and lime, of which the content of calcium carbonate is 10-40%, and the content of lime is 5-15%, but the existing process has not Comprehensive utilization of high-grade sludge

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  • Sludge backflow and reduction method in electroplating wastewater treatment process

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Embodiment 1

[0017] An electroplating nickel-containing wastewater treatment project, the daily treatment capacity of nickel-containing wastewater is 500 t / d, the raw water pH value is 1.3-2.4, the original treatment process uses lime to adjust the pH value, the lime consumption is 1.6 t / d, and the total sludge output It is 3.1 t / d. The calcium carbonate content in the secondary sludge is 20-32%, and the lime content is 10-15%. Using the process route provided by the present invention, after the secondary sludge is refluxed, the pH value of the primary pH adjustment tank is controlled below 4, the gas-water ratio is 12:1, and the reaction time is 35 min. After 2 consecutive months of stable In operation, the lime consumption is 1.4 t / d, a decrease of 12.5%, and the sludge output is 2.6 t / d, a decrease of 16.1%. The benefit from sludge and lime reduction reaches 700 yuan / d.

Embodiment 2

[0019] In an electroplating comprehensive wastewater treatment project, the daily treatment capacity of comprehensive wastewater is 6000 t / d, and the pH value of the raw water is 1.7-2.6. The original treatment process uses lime to adjust the pH value. The lime consumption is 14.5 t / d, and the sludge output is 39.2 t / d. The calcium carbonate content in the secondary sludge is 17-28%, and the lime content is 8-13%. Using the process route provided by the present invention, after the secondary sludge is refluxed, the pH value of the primary pH adjustment tank is controlled below 4, the gas-water ratio is 15:1, and the reaction time is 30 min. After 6 consecutive months of stable In operation, the lime consumption was 13.4 t / d, a decrease of 7.6%, and the sludge output was 35.7 t / d, a decrease of 8.9%. The benefit from sludge and lime reduction reaches 4,500 yuan / d.

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Abstract

The invention provides a sludge reflux and reduction method in an electroplating wastewater treatment process. The method is characterized in that the method is used for treating electroplating wastewater with the pH value of below 3, the electroplating wastewater is subjected to a two-stage reaction separation process, the pH value of the wastewater is adjusted through lime and secondary sludge in the whole process, the sludge in a first-stage sedimentation tank enters a sludge storage tank and then is subjected to filter pressing outsourcing treatment, and the sludge in a second-stage sedimentation tank refluxes to a first-stage reaction system through a reflux pump. According to the invention, a large amount of calcium carbonate and lime in the second-stage reflux sludge are fully utilized through process optimization, and the use amount of the first-stage lime and the overall sludge yield are reduced, so that the agent cost and the sludge treatment cost are remarkably reduced.

Description

technical field [0001] The invention relates to the field of electroplating wastewater treatment technology, and more specifically relates to a sludge return and weight reduction method in the electroplating wastewater treatment technology. Background technique [0002] The acidity of electroplating wastewater is high, the pH value is generally between 1.5-2.5, and there are a lot of heavy metals, so a lot of alkali is needed to neutralize the acidity and react with heavy metals to form hydroxide precipitates. Due to the cheap price of lime, calcium ions can remove inorganic anion pollutants such as phosphate and fluoride in the process of adjusting the pH value. Therefore, compared with liquid caustic soda, it has higher technical and economic advantages. However, due to the introduction of a large amount of calcium ions during the use of lime, it will also react with anions such as carbonate, and the sludge output will be larger, especially during the removal of cyanide an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/122C02F103/16C02F101/20
CPCC02F1/001C02F1/20C02F1/66C02F9/00C02F11/122C02F2001/007C02F2101/20C02F2103/16
Inventor 陈新才余华东任昆鹏何晓洁徐伟金素素楼洪海
Owner ZHEJIANG HI TECH ENVIRONMENTAL TECH