Chemical eluting agent for repairing mercury polluted soil and application method of chemical eluting agent

Abstract

The invention discloses a chemical eluting agent for repairing mercury polluted soil and an application method of the chemical eluting agent, and belongs to the technical field of polluted soil repairing. The eluting agent is composed of an independent agent A and an independent agent B. The agent A comprises a hydrochloric acid solution, a potassium iodide solution and a sodium thiosulfate solution. The agent B comprises a sodium hydroxide solution and a sodium hypochlorite solution. The application method of the chemical eluting agent includes the following steps of firstly, preprocessing and smashing the soil and picking out impurities, stones and the like; secondly, adding the eluting agent A and the mercury polluted soil according to the ratio of the polluted soil to the eluting agent being 1:10-1:20 for continuous or intermittent stirring for 4-8 h; thirdly, adding water to residual soil after solid-liquid separation for cleaning and eluting; fourthly, adding the eluting agent B to the soil obtained after cleaning and eluting in the third step for continuous or intermittent stirring for 4-8 h; fifthly, conducting direct backfilling after adding water to residual soil for cleaning and eluting after solid-liquid separation. The method mainly includes the two steps of eluting, and the mercury content in the soil is effectively reduced by means of the different eluting agent A and eluting agent B.

Description

[0001] technology neighborhood [0002] The invention belongs to the technical field of remediation of contaminated soil, in particular to methods for preparing and using a leaching agent in chemical leaching remediation. Background technique [0003] Due to the vigorous development of agriculture, industry, and mining, serious environmental pollution problems have been caused while the economy is developing. Among them, soil pollution is difficult to be quickly and effectively treated due to its latent, stable, and long-term characteristics. Mercury is a highly toxic non-essential element for life. Due to the high volatility of elemental mercury and its various organic compounds, it is easy to migrate and transform in the environment, and enter the human body through the food chain to cause irreversible harm. Therefore, Mercury has attracted much attention as a global environmental pollutant. In February 2006, the "Global Mercury Status Assessment" report issued by the Unit...

AI Technical Summary

Problems solved by technology

[0004] At present, the remediation of mercury-contaminated soil mainly adopts soil-exchanging method, thermal desorption, phytoremediation, etc., but these methods have their own weaknesses and deficiencies. For example, the process of exchanging soil with guest soil requires a lot of clean and clean Soil; the thermal desorption process consumes a lot of energy and is expensive; phytoremediation takes a long time and will be affected by soil, terrain, climate and other conditions