Method and device for quickly recycling heavy metal wastewater

Abstract

The invention discloses a method and device for quickly recycling heavy metal wastewater, which comprises the following steps of: after the heavy metal wastewater passes through a grid well, pouring the heavy metal wastewater into a pipeline mixer, adding a PH regulator for acid-base blending, further introducing the solution into a mixing reaction tank for mixing and reacting with Na2S to obtaina sulfurized solution, introducing the sulfurized solution into a chemical coagulation tank, adding a coagulant for stirring and coagulating, adding a magnetic seed into the obtained solution througha magnetic seed adding device to coagulate a non-magnetic suspended substance in the solution and the added magnetic seed into a magnetic micelle; a magnetic recovery machine is used to recover the magnetic seed of silt, the magnetic micro-coagulation is further removed, in the coagulation pool, the upper clean water is introduced into the disinfection pool through an outlet, and the upper water is subjected to standardized treatment, the silt at the bottom of the coagulation pool is introduced into a silt dehydrator by using a screw feeder to dehydrate and recycle the coagulated material. According to the invention, the method can quickly precipitate, separate and recover the wastewater containing the heavy metals.

Description

technical field [0001] The invention relates to the technical field of heavy metal wastewater treatment, in particular to a method and a device for rapidly recycling heavy metal wastewater. Background technique [0002] With the development of my country's economy and society, the shortage of water resources and water pollution are becoming more and more serious. Heavy metal wastewater is one of the most serious environmental pollution and one of the most harmful industrial wastewater to humans. Relevant statistics show that my country's metal wastewater accounts for about 10% of the total wastewater discharge, mainly from mining, metallurgy, machinery manufacturing, chemical industry, electronics, etc. Industrial production processes such as instruments and instruments are potentially harmful. These wastewater mainly contain heavy metal elements such as antimony, copper, lead, zinc, cadmium, arsenic, chromium, etc. If not handled properly, it will easily cause arsenic pollut...

AI Technical Summary

Problems solved by technology

Among them, the chemical coagulation sedimentation method is a commonly used method for metal wastewater treatment at home and abroad. This process uses lime as a neutralizing agent, which produces a large amount of sludge. The amount of slag to be processed in the follow-up is large, and it is easy to generate hazardous solid waste. The on-site operating environment is relatively harsh.

And due to the use of natural sedimentation, the flocculation and sedimentation time is long, requiring a large sedimentation tank, the treatment system occupies a large area, the treatment efficiency is low, and the effluent is unstable

The heavy metal precipitate produced by this process is hydroxide precipitation, with low heavy metal content, difficult washing and enrichment, high recycling cost, and low recycling value. Generally, it is only treated as hazardous waste, which limits this type of technology and products in many occasions. Applications

The ion exchange method, solvent extraction method, biological method, membrane separation method, etc., but due to large investment, high operating costs, unsatisfactory treatment effect, easy to cause secondary pollution and other problems, it is difficult to meet the treatment requirements of actual projects.

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