A method for reducing odor in remediation of pesticide chemical contaminated soil

A method for reducing odor in remediation of pesticide chemical contaminated soil, comprising the following steps:

• S101. primary covering the pesticide chemical contaminated soil
• odor control sustained-release particles are prepared and evenly covered on the surface of the pesticide chemical contaminated soil according to a certain dosage;
• S102. secondary covering the pesticide chemical contaminated soil;
• and
• odor covering base materials and mixed bacterial solution are prepared, and the odor covering soil is prepared by mixing the odor covering base materials and mixed bacterial solution in proportion, and then the odor covering soil is covered on the surface of the pesticide chemical contaminated soil covered by step S101;
• S103. heating the surface of the pesticide chemical contaminated soil
• heating rods are inserted into the pesticide chemical contaminated soil covered by step S102, and the surface layer of the pesticide chemical contaminated soil is heated to 30˜40° C., and the odor control sustained-release particles and the odor odor covering soil are used to reduce the odor of the pesticide chemical contaminated soil;
• the odor control sustained-release particle is composed of a base core and a core film for wrapping the base core,
• the base core is composed of absorbent powders, vermiculite powders and expansion particles in accordance with the mass ratio of 5˜7:5˜7:2 fully mixed and pressed into a particle size of 10˜15 mm, the core film is a degradable film;
• wherein, the expansion particle is composed of sodium bicarbonate and tartaric acid in accordance with the mass ratio of 4:1 mixed and pressed into a particle size of 2˜5 mm;
• the absorbent powder is one or more mixtures of bamboo charcoal powders and activated carbon powders in any ratios;
• a method for preparing the odor covering base materials is:
• 1) add 0.5˜2 L distilled water into each kilogram of straw powders and mix well to get the mixed solution;
• 2) add 4˜6 L hydrogen peroxide per kilogram of straw powders into the mixed solution, stir for 2˜3 h, and add 2˜4 L ammonia per kilogram of straw powders into the mixed solution, and the ammonia is slowly added at the flow rate of 40˜50 mL/min,
• wherein, the mass fraction of the hydrogen peroxide is 30%, the mass fraction of the ammonia is 28%;
• and
• 3) solids will be obtained by natural precipitation after reaction, and then dry the solids to obtain the odor covering base materials;
• the mixed bacterial solution is composed of one or more of Burkholderia, Bacillus subtilis, Taueria, Comamonas, pseudomonas, short-wave monomonas in any ratios;
• the odor covering soil consists of the odor covering base materials and mixed bacterial solution mixed according to the mass ratio of 7˜9:2.