Integrated membrane technology treating method for electroplating nickel-containing wastewater

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...

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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