Integrated treating and reusing device for heavy metal chemical leaching liquid waste and method for treating and reusing leaching liquid

Abstract

The invention discloses an integrated treating and reusing device for heavy metal chemical leaching liquid waste and a method for treating and reusing the leaching liquid. The integrated treating and reusing device comprises a sedimentation basin, a leaching liquid waste reaction tank, an MBR (Membrane Bioreactor) membrane subassembly, and an inorganic membrane filter, wherein the leaching liquid waste reaction tank is communicated with the sedimentation basin; the MBR membrane subassembly is arranged inside the leaching liquid waste reaction tank; a liquid outlet of the MBR membrane subassembly is communicated with a chelating agent collecting tank; the inorganic membrane filter is communicated with the leaching liquid waste reaction tank; a concentrate solution outlet of the inorganic membrane filter is communicated with the leaching liquid waste reaction tank; a leachate outlet of the inorganic membrane filter is communicated with an acid liquor recovery pool. The integrated treating and reusing device disclosed by the invention can recover the chelating agent, and further recover a part of acid liquor with high recovery efficiency and good quality of recovered liquid as impurities in the recovered liquid obtained through membrane filtration are less than that by the chemical precipitation method; when the recovered liquid obtained and treated by the device is reused, the leaching effect is better than that of the recovered liquid obtained by the chemical precipitation method.

Description

technical field [0001] The invention relates to the field of soil heavy metal chemical leaching waste liquid treatment, in particular to a heavy metal chemical leaching waste liquid treatment and reuse integrated device and a leaching liquid treatment and reuse method. Background technique [0002] With the rapid development of industry and the acceleration of urbanization, the heavy metal pollution in my country's soil is becoming more and more serious, and the restoration and treatment of heavy metal-contaminated soil has become urgent. At present, a series of heavy metal soil remediation technologies have been proposed at home and abroad, which are mainly divided into physical remediation technology, phytoremediation technology, microbial remediation technology and chemical remediation technology. [0003] Among the above-mentioned remediation technologies, the chemical leaching method, which belongs to the chemical remediation technology, mainly transfers heavy metals fr...

AI Technical Summary

Problems solved by technology

[0008] Membrane filtration is also a method of physical separation, but its application in the treatment of heavy metal leaching wastewater has not been reported. The main reason is that although membrane filtration can improve recovery efficiency, if the treatment process is not changed, membrane separation is simply used. Instead of chemical precipitation, its investment and operating costs will be greatly increased

In addition, due to the complex composition and high acidity / alkalinity of the heavy metal leaching waste liquid, there are certain requirements for the material and structure of the membrane. The most widely used roll-type organic membrane in wastewater treatment has relatively low acid-base tolerance. Poor, and easy to pollute, therefore, membrane filtration is not suitable for the treatment of heavy metal eluent waste

Images