Heavy metal wastewater treatment medicament and treatment method of heavy metal wastewater

Abstract

The invention relates to a heavy metal wastewater treatment medicament. The heavy metal wastewater treatment medicament comprises the following raw materials by weight: 1 part of cationic polyacrylamide, 3 to 8 parts of anionic polyacrylamide, 10 to 30 parts of an inorganic flocculating agent, 1 to 3 parts of a heavy metal chelating agent, and 58 to 85 parts of an absorbent. The invention further provides a heavy metal wastewater treatment method which comprises the following steps: taking 1 L of chemical wastewater; adding a NaOH solution into the wastewater till the pH of the obtained solution is 8.0 to 9.0; adding the heavy metal wastewater treatment medicament into the obtained solution, wherein the addition volume of the heavy metal wastewater treatment medicament is 0.04 to 0.08 percent of the weight of the chemical wastewater; stirring fast for 10 seconds; stirring slowly for 20 minutes; stopping stirring; allowing the obtained liquid to stand still for 10 minutes for layering. The heavy metal wastewater treatment medicament and the heavy metal wastewater treatment method have the benefits that 1, the preparation is simple; 2, the molecular weight of cationic polyacrylamide is low, and positive charge groups of cationic polyacrylamide can adsorb negative charges of bentonite, so that a filtration aiding system of a tight structure is formed; 3, anionic polyacrylamide is high in molecular weight, so as to subside fast and generate thick floc.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a heavy metal sewage treatment agent and a treatment method thereof. Background technique [0002] With the rapid development of industrial and agricultural economy, the discharge of wastewater is increasing day by day. A large amount of industrial wastewater containing heavy metals and urban domestic sewage are discharged into the environment, causing serious pollution to the atmosphere, soil and water environment. Heavy metal wastewater contains arsenic, mercury, lead, copper, zinc, chromium, nickel and other elements. Most of the heavy metal wastewater comes from electroplating, mining, chemical industry and other departments. The type, content and existing form of heavy metal ions in wastewater vary with different production types. big difference. Due to the characteristics of strong toxicity, persistence, and non-degradability of heavy metal ions, once heavy metals...

AI Technical Summary

Problems solved by technology

In view of the low concentration of heavy metal wastewater, complex components, and strict treatment standards, the existing water treatment chemicals may be able to treat heavy metal ions in industrial wastewater, but they cannot achieve a good removal effect on substances other than heavy metal ions in wastewater

At the same time, there are still problems such as high price, poor treatment effect, slow sedimentation speed, large dosage, sticky filter cloth, etc.