Method for solidification stabilization of heavy metal contaminated soil with fly ash as raw material

Abstract

The invention provides a method for solidification stabilization of heavy metal contaminated soil with fly ash as a raw material. A feasible method is provided for treatment of the heavy metal contaminated soil. The method comprises the following steps: (1) an intermediate material and an alkali activator are prepared, specifically, sodium hydroxide and a water glass solution are mixed as the alkali activator, and the heavy metal contaminated soil and the fly ash are mixed as the intermediate material; (2) material mixing is conducted, specifically, the intermediate material and the alkali activator are mixed according to a mass ratio of 5:(2 to 3); and (3) a solidification body is prepared, specifically, after a mixed material is stirred, slurry is prepared and poured into a mold, compaction forming is conducted, after curing, demolding is conducted, and the solidification body capable of conducting solidification stabilization on heavy metal in the soil is prepared. The mode that thefly ash is taken as the basic raw material to solidify and remediate the heavy metal contaminated soil is adopted, and part of the contaminated soil replaces the fly ash to prepare geopolymers so that the effect of 'using waste to treat waste' can be achieved.

Description

technical field [0001] The invention belongs to soil pollution control technology, in particular to a solidification and stabilization method for heavy metal polluted soil using fly ash as a raw material. Background technique [0002] At present, soil pollution control methods mainly include physical remediation, biological remediation and chemical remediation. [0003] Common physical remediation methods include alien soil and soil replacement method, pyrolysis method, isolation and embedding method, etc.; common biological remediation methods include phytoremediation and microbial remediation; and common chemical remediation methods include curing stabilization method, chemical leaching method, and chemical oxidation method. restore etc. Usually, physical remediation and chemical remediation have the advantages of obvious and rapid treatment effect for heavily polluted and small-area soil. [0004] Among them, the solidification and stabilization method in chemical remed...

AI Technical Summary

Problems solved by technology

However, the current research object is only to use fly ash as a raw material, to study artificially added powdered heavy metal reagents or heavy metal-containing slag, to understand its solidification and stabilization effect, and rarely involves research on the solidification and stabilization of heavy metal-containing soils.

Images