A biological flocculant used in the recovery of heavy metals in electroplating wastewater

Abstract

The invention discloses a bioflocculant applied to recovering heavy metals in electroplating wastewater. The bioflocculant is an electroplating wastewater treatment agent which is compounded by polyacrylamide, dehydrated polymeric ferric sulfate and polyglutamic acid as compounded basic raw materials for recovering heavy metals in the electroplating wastewater, wherein according to the three compounded basic raw materials, the optimal compounding ratio of polyacrylamide, dehydrated polymeric ferric sulfate and polyglutamic acid in parts by weight is 2: 3: 1 and any one of the basic raw materials of polyacrylamide, dehydrated polymeric ferric sulfate and polyglutamic acid can be independently used for receiving heavy metals in the electroplating wastewater. By compounding the raw materials, a mutual coordination effect among the raw materials can be exerted to the maximum extent, and various heavy metal ions can be precipitated. The treatment method of the bioflocculant is simple, and heavy meals in the electroplating wastewater can be efficiently recovered by inputting a reagent to remove and recover heavy metal ions without problems such as secondary pollution and the like, so that the cost for treating the electroplating wastewater can be effectively lowered.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an electroplating wastewater treatment agent, in particular to a biological flocculant used in the recovery of heavy metals in electroplating wastewater. Background technique [0002] The electroplating industry is an important processing industry in my country. At present, galvanizing, copper plating, chrome plating and nickel plating are distributed in machine manufacturing, light industry, electronics, aviation and instrumentation manufacturing; it is understood that the annual discharge of electroplating wastewater in the country More than 400 million tons have caused serious environmental pollution. The water quality of electroplating wastewater is complex, which contains metal ions and cyanides such as copper, nickel, cadmium, chromium, zinc, silver and gold, and some are highly toxic substances that are carcinogenic, teratogenic and mutagenic. [0003] At present,...

AI Technical Summary

Problems solved by technology

Using this method to treat electroplating wastewater requires a large amount of chemicals, occupies a lot of land, and requires a large investment. It is difficult to operate and manage, and the operating cost is high, and it is impossible to ensure that the effluent is stable and up to standard.