Integrated membrane technology treating method for electroplating nickel-containing wastewater

A treatment method, the technology of the full-membrane method, is applied in the direction of water/sewage treatment, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc. It can solve the problems of inability to meet discharge standards stably, difficulty in meeting nickel standards stably, and nickel exceeding standards, etc. problems, to achieve the effect of reducing the amount of chemicals used, reducing the amount of sludge, and a high degree of self-control

Inactive Publication Date: 2017-08-18
GUANGDONG XINDAYU ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) In addition, if the wastewater contains hypophosphorous acid, phosphorous acid, and hypophosphorous acid, complexed nickel will be formed, which will also cause phosphorus to exceed the standard
[0003] Main problems and determination: After the above-mentioned treatment methods, the nickel content in the nickel-containing wastewater is generally around 0.5mg / L, and there are fluctuations, which cannot meet the discharge standards stably, especially in Table 3 in the electroplating wastewater discharge standards (Ni≤ 0.1mg / L); the above treatment method needs to add a large amount of chemicals, and will produce a large amount of sludge, nickel is the first type of pollutant, nickel-containing sludge is hazardous waste, and it is necessary to find qualified sludge Special treatment by the treatment company; the above-mentioned treatment methods have strict requirements on operation and operation, and the possibility of artificially causing nickel to exceed the standard is relatively high (influenced by the amount of dosage), making it difficult for the nickel in the wastewater to reach the standard stably

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A treatment method for electroplating nickel-containing wastewater in an electroplating park, the pH of the nickel-containing wastewater is 1.5 to 2.5, the CODcr is 200 to 450 mg / L, the total copper is 5 to 10 mg / L, the ammonia nitrogen is 15 to 35 mg / L, and the nickel is 150~400mg / L, total phosphorus 100~250mg / L. Its processing method includes the following steps:

[0029] 1. pH adjustment reaction: pump the nickel-containing wastewater adjusted by the adjustment tank into the reaction tank, and use an online pH meter to add sodium hydroxide solution with a mass concentration of 10% to the nickel-containing wastewater to adjust the pH value of the wastewater to 5.0. Most of the metal ions in the wastewater form precipitates.

[0030] 2. Sedimentation treatment: The waste water supernatant treated in step 1 flows into the sedimentation tank for sedimentation to remove part of the suspended solids and pollutants, and the settled sludge enters the sludge collection tank,...

Embodiment 2

[0042] A treatment method for electroplating nickel-containing wastewater in an electroplating park, the pH of the nickel-containing wastewater is 1.5 to 2.5, the CODcr is 200 to 450 mg / L, the total copper is 5 to 20 mg / L, the ammonia nitrogen is 15 to 35 mg / L, and the nickel is 150-400mg / L, total phosphorus 100-250mg / L, the treatment method includes the following steps:

[0043] 1. Pump the adjusted nickel-containing wastewater into the reaction tank, add sodium hydroxide solution with a mass concentration of 8% to the nickel-containing wastewater using an online pH meter, and adjust the pH value of the wastewater to 4.5, so that most of the wastewater metal ions to form precipitates.

[0044] 2. Sedimentation treatment: Put the adjusted wastewater in step 1 into the sedimentation tank for sedimentation, remove part of the suspended solids and pollutants, and the sedimented sludge enters the sludge collection tank, followed by pressure filtration treatment, and the filtrate o...

Embodiment 3

[0052] A treatment method for electroplating nickel-containing wastewater in an electroplating park, the pH of the nickel-containing wastewater is 1.5 to 2.5, the CODcr is 200 to 450 mg / L, the total copper is 5 to 20 mg / L, the ammonia nitrogen is 15 to 35 mg / L, and the nickel is 150-400mg / L, total phosphorus 100-250mg / L, the treatment method includes the following steps:

[0053] 1. pH adjustment reaction: pump the adjusted nickel-containing wastewater into the reaction tank, add alkali tablets to the nickel-containing wastewater using an online pH meter, adjust the pH value of the wastewater to 5.5, and make most of the metal ions in the wastewater form Precipitate.

[0054] 2. DF treatment: the wastewater adjusted in step 1 enters the DF concentration tank, pumps the mixed solution in the concentration tank into the DF membrane for concentration, the DF produced water enters the DF produced water tank, and the concentrated mixed solution enters the DF concentration tank agai...

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PUM

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Abstract

The invention discloses an integrated membrane technology treating method for electroplating nickel-containing wastewater. Specifically, the method comprises the following steps: (1) performing pH regulating reaction: adding alkaline into the electroplating nickel-containing wastewater and regulating the pH value of the electroplating nickel-containing wastewater to 4.5-5.5; (2) removing suspended solids, bacteria, viruses, colloids and macromolecules from the wastewater treated in the step (1), thereby keeping the turbidity of the wastewater below 1 and SDI below 5; (3) filtering by adopting a safety filter: pumping the wastewater treated in the step (2) into the safety filter and adding an anti-scaling agent into the wastewater; (4) filtering in a nano-filtration manner; (5) filtering by adopting the safety filter; and (6) filtering by using a reverse osmosis system. After the electroplating nickel-containing wastewater is treated according to the method disclosed by the invention, the produced water can reach the table 3 standard in Electroplating Pollutant Discharge Standard (GB 21900-2008); and meanwhile, the dosage of the drug can be reduced, the sludge quantity is reduced, and the secondary pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to the technical field of electroplating nickel-containing wastewater treatment, and more specifically to a full-membrane treatment method for electroplating nickel-containing wastewater. Background technique [0002] Nickel-containing wastewater mainly comes from the cleaning water of the nickel plating production line. Since nickel is the first type of pollutant, it needs to be treated separately to meet the standard before it can be discharged. The conventional treatment methods are: (1) Control the pH of this kind of wastewater at about 11, which can generate stable hydroxide precipitates and remove them. It needs to be collected separately in the workshop and treated separately to discharge after reaching the standard. (2) In addition, if the wastewater contains hypophosphorous acid, phosphorous acid, and hypophosphorous acid, complex nickel will be for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/001C02F1/441C02F1/442C02F1/66C02F5/00C02F9/00C02F2101/20
Inventor 麦建波陈利军范宁武钟志刚庄伟涛刘恋赖治城
Owner GUANGDONG XINDAYU ENVIRONMENTAL PROTECTION TECH CO LTD
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