Method for treating electroplating wastewater through a combination of a chemical precipitation method and a membrane separation method
A technology for chemical precipitation, electroplating wastewater, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc. The effect of reducing the amount of mud and reducing the consumption of chemicals
Inactive Publication Date: 2020-04-17
ZHAOQING UNIV
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Problems solved by technology
[0005] In order to overcome the shortcomings of high chemical consumption, large amount of sludge and unrecyclable effluent in the current chemical method, the present invention provides a treatment method for electroplating wastewater, which can not only make electroplating wastewater recycled after treatment, but also It can also greatly reduce the consumption of chemicals and the amount of sludge
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[0017] The present invention is further described in conjunction with the following examples.
[0018] refer to figure 1 , the original electroplating wastewater 1 from an electroplating workshop was adjusted to pH 10-11 with NaOH in the pre-sedimentation adjustment tank 2, and after adjustment, the electroplating wastewater 8 entered the chemical reaction tank 3, firstly added NaOCl oxidant, and stirred for 30 minutes; then Add FeCl 2 Reductant, stirring for 20 minutes; then use NaOH to adjust the pH value of the wastewater to 8-9, and after standing for precipitation, the electroplating wastewater 9 after the chemical treatment is pumped into the electrodialyzer 5, and the electrodialyzer 5 carries out desalination treatment. The dialysis fresh water 6 is tested to be better than the water quality index of tap water, and can be reused as rinsing water in the electroplating workshop. Table 1 provides the test result of treating electroplating wastewater with this method:
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The invention relates to a method for treating electroplating wastewater through a combination of a chemical precipitation method and a membrane separation method. According to the method, electroplating wastewater is treated by using the chemical precipitation method at first, then separation treatment via an electrodialysis membrane is performed; and the wastewater treated by the chemical precipitation method can be discharged when the concentration of heavy metal ions such as chromium, copper, zinc and nickel in the wastewater is less than 5 mg / L. According to the method, the electroplatingwastewater can be reused as rinse water in an electroplating workshop after being treated, and the consumption of an oxidizing agent, the consumption of a reducing agent and the consumption of electroplating sludge can be reduced by 40%, 50% and 50% respectively compared with the consumption of the oxidizing agent, the consumption of the reducing agent and the consumption of the electroplating sludge in a traditional chemical method.
Description
technical field [0001] The invention relates to the field of electroplating wastewater treatment, in particular to a method for jointly treating electroplating wastewater by a chemical precipitation method and a membrane separation method. Background technique [0002] Electroplating wastewater contains highly toxic cyanide and heavy metal ions such as chromium, copper, zinc, nickel, etc., and must be treated to meet the standard before it can be discharged, otherwise it will cause serious pollution to the environment. [0003] At present, the treatment of electroplating wastewater at home and abroad mainly adopts chemical methods, that is, cyanide ions (CN - ) is oxidized to CO 2 and N 2 ;Use a reducing agent to reduce hexavalent chromium ions to trivalent chromium ions under acidic conditions, and then add sodium hydroxide or calcium hydroxide to the water to make trivalent chromium form chromium hydroxide precipitates, and other heavy metal ions such as copper and zinc ...
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IPC IPC(8): C02F9/06C02F101/18C02F101/22C02F103/16C02F101/10C02F101/12
CPCC02F1/4693C02F1/5245C02F1/66C02F1/70C02F1/72C02F9/00C02F2101/101C02F2101/12C02F2101/18C02F2101/22C02F2103/16
Inventor 彭昌盛戴敏李俊鑫曾祥泳
Owner ZHAOQING UNIV