A system and method for direct reuse of electroplating cleaning wastewater

A direct technology for cleaning wastewater, applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, multi-stage water treatment, etc., can solve the problems of complicated electroplating wastewater treatment process, low reuse rate of electroplating cleaning water, and high cost, and achieves a degree of automation. High efficiency, short response time and low input cost

Active Publication Date: 2018-02-23
SHENZHEN POLYTECHNIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a system and method for direct reuse of electroplating cleaning wastewater, aiming to solve the problems of low reuse rate of electroplating cleaning water and the cumbersome and high cost of the existing electroplating wastewater treatment process

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  • A system and method for direct reuse of electroplating cleaning wastewater

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Embodiment 1

[0042] Example 1: The electroplating cleaning water of a certain factory contains Cu 253mg / L, Ni 232mg / L, Cr 12mg / L, Zn 37mg / L, pH is 2.45, after being processed by the system of the present invention, it is reused in the cleaning process The water contains Cu 0.15mg / L, Ni0.03mg / L, Cr 0.19mg / L, Zn 0.09mg / L, pH is 7.11, and the content of heavy metals in reused water is stable up to the standard in Table 3 of GB21900-2008. After the implementation of the scheme of the present invention, 80% of the electroplating cleaning water of the factory is reused for production after treatment, and 20% is reused for other purposes in the factory area, and the total waste water discharge is reduced by more than 60%.

Embodiment 2

[0043] Example 2: The electroplating cleaning water of a certain factory contains Cu 184mg / L, Ni 202mg / L, Cr 74mg / L, Zn 78mg / L, pH is 2.73, after being processed by the system of the present invention, it is reused in the cleaning process The water contains 0.11mg / L Cu, 0.06mg / L Ni, 0.17mg / L Cr, and 0.13mg / L Zn, and the pH is 7.15. The content of heavy metals in reused water is stable up to the standard in Table 3 of GB21900-2008. After the implementation of this plan, 85% of the electroplating cleaning water in the factory will be reused for production after treatment, 5% will be used for dispensing in the water treatment workshop, and 10% will be used for floor washing in the workshop, road washing and greening, etc. The total wastewater discharge Reduced by more than 60%.

Embodiment 3

[0044] Example 3: Treatment of electroplating cleaning water in a factory, containing Cu 184mg / L, Ni 202mg / L, Cr 74mg / L, Zn 78mg / L, pH 2.68. After the electroplating cleaning water reaches a certain height, it enters the first regulating pool through the pipeline under the action of the raw water pump. The opening and closing of the raw water pump is automatically controlled by the liquid level in the raw water pool; Stirred by the first agitator, when the pH in the first adjustment pool reaches 9.8, the alkali adding pump stops adding alkali solution, and the opening and closing of the alkali adding pump is regulated by the pH automatic control device in the first adjustment pool; the submerged The membrane pore diameter in the membrane module is 50nm, and the operating pressure is -15kPa; when the pool liquid enters the second adjustment pool, the acid pump pumps 7% sulfuric acid or hydrochloric acid into the pool liquid and is stirred by the second agitator, and the second a...

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Abstract

The invention discloses a direct reuse system of electroplating rinse-wastewater and a method thereof. The system of the invention mainly comprises a raw water tank, a raw water pump, a first regulating tank, a comprehensive reaction tank, a suction pump, a second regulating tank and an electroplating rinse-water reuse tank. By arranging an immersed assembly and a sloping plate in the comprehensive reaction tank, regeneration of heavy metal hydroxide particles in electroplating rinse-wastewater is realized, so as to form large particles under the condition of not adding a coagulant; and the electroplating rinse-wastewater is filtered such that the filtered electroplating rinse-wastewater can be directly reused. In comparison with the prior art, the invention has advantages of simple processing step, short reaction time, low input cost, high treatment efficiency and high degree of automation. By the system and the method, emission of heavy metal wastewater can be controlled, and water quality can be controlled to reach the reuse standard. The system and the method have high practicality and economic value.

Description

technical field [0001] The invention relates to the field of heavy metal-containing wastewater treatment, in particular to a system and method for direct recycling of electroplating cleaning wastewater. Background technique [0002] The electroplating industry is a large water consumer and produces a large amount of waste water containing heavy metals, which is a heavy polluting industry. But from some perspectives, the development of modern industry is inseparable from the supporting role of electroplating technology, and the electroplating industry is indispensable in industrial development. More than 80% of the discharged electroplating wastewater comes from the cleaning process of electroplating parts, that is, the electroplating cleaning water. The content of heavy metals in this part of the water is not very high, but it still needs to be treated to meet the discharge standards, otherwise it will cause serious ecological accidents. At present, the reuse rate of elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/44C02F1/66C02F9/00C02F2103/16C02F2301/08
Inventor 朱佳范小江高静思陈丽婷
Owner SHENZHEN POLYTECHNIC
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