Treatment method of acidic heavy metal wastewater

Abstract

The invention provides a treatment method of acidic heavy metal wastewater. The method comprises the following steps: firstly, adding magnesium oxide with less slag amount as an acid removing agent into the acid wastewater to treat the acid wastewater; adjusting a pH value, removing most heavy metals capable of being precipitated and removed, and oxidizing and breaking complex metals and reducinghigh-valence chromium under the cooperative effect of a Fenton reagent; and adding polyacrylamide and polyferric sulfate coagulants to deeply remove the heavy metals. The method is suitable for treating acid heavy-metal-containing wastewater in the industries of metallurgy, electroplating and the like, can realize standard discharge of heavy metal pollutants and greatly reduces subsequent solid waste treatment cost due to the fact that the amount of generated solid waste is greatly reduced; and a magnesium salt in the wastewater can be crystallized and recycled.

Description

technical field

[0001] The invention belongs to the technical field of sewage treatment, in particular to a treatment method for acidic heavy metal wastewater. Background technique

[0002] Electroplating and metallurgy are industrial industries with serious pollution. The wastewater discharged during the production process contains heavy metal ions such as copper, nickel, chromium, highly toxic substances such as cyanide, and a large number of organic pollutants. The water quality is complex and difficult to control. One of the difficult industrial wastewater. The composition of heavy metal wastewater is relatively complex. At present, there are many methods to treat this kind of wastewater at home and abroad, such as chemical precipitation method, electrochemical method, heavy metal capture method, artificial wetland method, etc. For the more harmful acidic heavy metal wastewater, chemical precipitation is currently the most important treatment method. Neutralizers used ...