Patent ID: 11964316
Assignee: NANJING INSTITUTE OF ENVIRONMENTAL SCIENCES, MEE
Field: Environmental technology (Chemistry)
Classification: CPC B  Y | IPC B

Claim 0:
1. A method for reducing odor in remediation of pesticide chemical contaminated soil, comprising the following steps:
(S101) covering a pesticide chemical contaminated soil including preparing odor control sustained-release particles spreading the odor control sustained-release particles on the surface of the pesticide chemical contaminated soil;
(S102) covering the pesticide chemical contaminated soil again, including preparing odor covering base materials and mixed bacterial solution and preparing the odor covering soil by mixing the odor covering base materials and mixed bacterial solution, and then covering the odor covering soil on the surface of the pesticide chemical contaminated soil by step (S101);
(S103) heating the surface of the pesticide chemical contaminated soil including inserting heating rods into the pesticide chemical contaminated soil covered by step (S102), and heating the surface layer of the pesticide chemical contaminated soil to 30-40° C., and using the odor control sustained-release particles and the odor covering soil to reduce the odor of the pesticide chemical contaminated soil; wherein the odor control sustained-release particles are composed of a base core and a core film for wrapping the base core, wherein the base core is composed of absorbent powders, vermiculite powders and expansion particles in accordance with a mass ratio of 5-7:5-7:2 that are fully mixed and pressed into a particle size of 10-15 mm, wherein the core film is a degradable film; wherein, the expansion particles are composed of sodium bicarbonate and tartaric acid in accordance with a mass ratio of 4:1 that are mixed and pressed into a particle size of pp2-5 mm; wherein the absorbent powder is one or more mixtures of bamboo charcoal powders and activated carbon powders; wherein a method for preparing the odor covering base materials including
1) adding 0.5-2 L distilled water into each kilogram of straw powders and mixing well to get the mixed solution;
2) adding 4-6 L hydrogen peroxide per kilogram of straw powders into the mixed solution, stirring for 2-3 h, and adding 2-4 L ammonia per kilogram of straw powders into the mixed solution, and slowly adding the ammonia at the flow rate of 40-50 mL/min, wherein, a mass fraction of the hydrogen peroxide is 30%, and a mass fraction of the ammonia is 28%; and
3) Obtaining solids by natural precipitation after reaction, and then drying the solids to obtain the odor covering base materials; wherein the mixed bacterial solution is composed of one or more of Burkholderia, Bacillus Subtilis, Taueria, Comamonas, Pseudomonas, short-wave Monomonas; wherein the odor covering soil is a mixer of the odor covering base materials and mixed bacterial solution mixed according to the mass ratio of 7-9:2.