Treatment method of organochlorine pesticide polluted soil

Abstract

The invention discloses a treatment method of organochlorine pesticide polluted soil, which comprises the following steps: (1) pretreatment: detecting and analyzing organochlorine pesticide polluted soil; digging out the organochlorine pesticide polluted soil, and mechanically and manually screening to remove impurities; adding quicklime, stirring, piling, and carrying out thermal desorption to remove volatile organic pollutants, thereby obtaining pretreated organochlorine pesticide polluted soil; and (2) cement rotary kiln treatment: after metering the pretreated organochlorine pesticide polluted soil, grinding with clay, iron powder and limestone to obtain cement raw meal, homogenizing the cement raw meal, sending into a preheater to carry out preheating, sending into a decomposition furnace to carry out decomposition, sending into a cement rotary kiln, calcining to obtain cement clinker, cooling the cement clinker, and grinding to obtain cement. The treatment method disclosed by the invention has the advantages of no toxicity, low cost and no secondary pollution on the environment, can change wastes into valuable substances, and effectively utilizes the resources.

Description

technical field [0001] The invention relates to a method for treating polluted soil, in particular to a method for treating soil polluted by organochlorine pesticides. Background technique [0002] With the advancement of industrialization and urbanization and the sharp increase in the types and quantities of agricultural chemicals, the soil near industrial areas is seriously polluted. DDT, HHC, chlordane, mirex, polychlorinated biphenyls, dioxins and other organochlorine pesticides have attracted the attention of the international community as a class of important persistent organic pollutants. , low solubility and persistence make it difficult for traditional contaminated soil treatment methods to achieve ideal results. [0003] At present, there are mainly the following methods for the treatment of organochlorine pesticide-contaminated soil: (1) On-site direct coverage and off-site landfill: This method can block the exposure route, but cannot reduce its toxicity, and th...

AI Technical Summary

Problems solved by technology

DDT, HHC, chlordane, mirex, polychlorinated biphenyls, dioxins and other organochlorine pesticides have attracted the attention of the international community as a class of important persistent organic pollutants. , low solubility and persistence make it difficult for traditional contaminated soil treatment methods to achieve ideal results

[0003] At present, there are mainly the following methods for the treatment of organochlorine pesticide-contaminated soil: (1) On-site direct coverage and off-site landfill: This method can block the exposure route, but cannot reduce its toxicity, and the site will have long-term environmental risks and land use functional limitations

(2) Biodegradation: Biodegradation is the use of microorganisms, enzymes, etc. to treat organic pollutants. It is a green method, but biodegradation is still in the research stage, the biodegradation rate is still low, and the treatment time is long, so it is not suitable for industrial use.

The disadvantage of this method is that heavy metal catalysts are prone to "poisoning" when applied in the field