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Technology for treating electroplating wastewater

A technology of electroplating wastewater and treatment process, which is applied in the direction of metallurgical wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. It can solve the problems of difficult operation, high cost, environmental pollution, etc., achieve efficient treatment and discharge, reduce The effect of processing costs

Inactive Publication Date: 2018-08-21
FOSHAN SANSHUI WANRUI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the existing electroplating wastewater treatment methods are relatively complicated and require the use of large-scale equipment. Not only is the operation difficult and the cost is high, but also the electroplating wastewater cannot be perfectly treated, and it is easy to cause environmental pollution when discharged.

Method used

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  • Technology for treating electroplating wastewater

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Effect test

Embodiment 1

[0025] (1) Import the collected electroplating wastewater into the wastewater regulating tank for equalization and adjustment treatment to buffer the wastewater treatment load, reduce the fluctuation of wastewater flow into the subsequent treatment system, and initially precipitate high-concentration harmful sedimentation substances;

[0026] (2) After the water quantity and water quality in the wastewater regulating tank are relatively stable, transport it to the pretreatment tank, add diatomaceous earth coagulant, lye (26% sodium hydroxide solution) in turn, and stir and mix evenly for a period of time Realize chemical pretreatment, wherein the stirring speed is 71r / min, and the time is 26min;

[0027] (3) Transport the wastewater pretreated in step (2) to the coagulation sedimentation tank, add flocculant (combination of inorganic flocculant (alum, aluminum sulfate, polyferric sulfate, etc.) and polyacrylamide series flocculant), After stirring and mixing evenly, immerse fo...

Embodiment 2

[0032] (1) Import the collected electroplating wastewater into the wastewater regulating tank for equalization and adjustment treatment to buffer the wastewater treatment load, reduce the fluctuation of wastewater flow into the subsequent treatment system, and initially precipitate high-concentration harmful sedimentation substances;

[0033] (2) After the water volume and water quality in the wastewater regulating tank are relatively stable, it is transported to the pretreatment tank, and coagulant aids (one or two combinations of bentonite, diatomaceous earth, and calcium oxide) and lye ( 26% sodium hydroxide solution) and realize chemical pretreatment after stirring and mixing uniformly for a period of time, wherein the stirring speed is 65r / min, and the time is 30min;

[0034] (3) Transport the wastewater pretreated in step (2) to the coagulation sedimentation tank, and add an alum flocculant (a combination of an inorganic flocculant (alum, aluminum sulfate, polyferric sulf...

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Abstract

The invention discloses a technology for treating electroplating wastewater. The technology includes a series of technological processes of wastewater regulation, chemical pretreatment, flocculation,precipitation, sand filtration, carbon filtration, ultra-filtration, reverse osmosis and the like. The technology has the advantages that a stable cushion environment is provided to the wastewater atfirst, accordingly, fluctuation of the flow of the wastewater which flows into treatment systems can be reduced, and high-concentration harmful precipitation substances can be preliminarily precipitated; substances in the electroplating wastewater can be neutralized to be granular and can be aggregated and precipitated by means of chemical pretreatment and flocculation, solid particles, colloid and the like which are macromolecular pollutants in the electroplating wastewater can be adsorbed by means of sand filtration and carbon filtration, then the colloid, suspended matters, macromolecular substances, heavy metal substances, small-molecule harmful substances and the like in the electroplating wastewater can be removed in a distributed manner by means of ultra-filtration and reverse osmosis, and accordingly the purpose of thoroughly purifying the wastewater can be ultimately achieved; merits of diversified treatment modes are gathered by the novel technology, distributed treatment isadopted in a combination manner, and accordingly the wastewater can be efficiently treated and meets discharge requirements under the condition that the treatment cost is reduced to the greatest extent.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to an electroplating wastewater treatment process. Background technique [0002] The sources of electroplating wastewater are generally the cleaning water of plating parts, waste electroplating solution, other wastewater and equipment cooling water, including washing the floor of the workshop, scrubbing plate washing water, condensate water from ventilation equipment, and water caused by leakage of plating tanks or improper operation and management. Various bath liquids and drainage, cooling water are not polluted except for temperature rise during use. The water quality and quantity of electroplating wastewater are related to factors such as electroplating production process conditions, production load, operation management and water use methods. Electroplating wastewater The water quality is complex and its composition is difficult to control. It contains chromium, cadmium,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16C02F101/20
CPCC02F1/001C02F1/441C02F1/444C02F1/5236C02F1/5245C02F1/56C02F9/00C02F2001/007C02F2101/20C02F2103/16
Inventor 侯长华
Owner FOSHAN SANSHUI WANRUI ENVIRONMENTAL PROTECTION TECH CO LTD
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