Efficient treatment method for electroplating nickel-containing waste water

Abstract

The invention discloses an efficient treatment method for electroplating nickel-containing waste water.The method comprises the following steps that 1, under the acidic condition, the electroplating nickel-containing waste water is subjected to a microelectrolysis reaction in a microelectrolysis reactor till the pH value of the electroplating nickel-containing waste water ranges from 4.0 to 5.0; 2, an oxidizing agent is added, and the electroplating nickel-containing waste water is subjected to secondary microelectrolysis in the microelectrolysis reactor continuously; 3, an alkaline solution is added, and the pH value of the electroplating nickel-containing waste water ranges from 9.5 to 11.0; 4, coagulant and flocculant are added to the electroplating nickel-containing waste water in sequence for coagulating sedimentation, and final supernate is treated waste water capable of being discharged.The efficient treatment method for the electroplating nickel-containing waste water is easy to operate and stable in effect, chemicals such as a heavy metal chelating agent and sodium sulfide which are bad for the environment do not need to be added, and secondary pollution to environment is avoided; the occupied area is saved, the requirements on reaction conditions are low, the waste water pH can be increased in the reaction process, the alkali quantity needed by follow-up alkali adjustment is decreased, and a product obtained through treatment can be recycled.

Description

technical field

[0001] The invention relates to a treatment method for electroplating wastewater, in particular to an efficient treatment method for electroplating nickel-containing wastewater, which belongs to the technical field of wastewater treatment. Background technique

[0002] As a common heavy metal ion in electroplating industry wastewater, nickel has greatly promoted the development of my country's economy and society. Although nickel is one of the trace elements necessary for living things, excessive nickel can retard the growth and development of plants, cause poor plant growth, cause harm to plants, and even die. At the same time, nickel can accumulate in plants, and when plants exceeding normal levels enter the food chain, it will affect the health of animals and even humans. Nickel can form nickel carbonyl with carbonyl compounds in water, which is highly toxic and an internationally recognized carcinogen. If electroplating nickel-containing sewage is disch...