METHOD AND PLANT FOR MICROBIOLOGICAL TREATMENT OF SOILS CONTAMINATED BY HEAVY METALS AND OIL PRODUCTS (VERSIONS) Russian patent published in 2013 - IPC B09C1/10 

FIELD: process engineering.

SUBSTANCE: set of invention relates to reclamation and biotechnologies. Proposed method comprises loading contaminated soil into reactor to uniformly distribute it therein. Then, sand with biosorbant added thereto is loaded into said reactor to mix it with soil to make the mix of components to be processed by water solution of humic acid of 2-5%-concentration in water to moisture content of prepared mix making 50-60%. Said mix is held and periodically mixed in the reactor. Specified concentration of contaminants reached, mixing is terminated to discharge cleaned mix. Instead of adding biosorbant to sand, the latter is treated by the mix of humic acid with concentration in water of 2-5 wt % and bioagent of 0.01-0.05%. Proposed plant comprises intake bin with cover for working medium, device to transfer working medium from said bin into bioreactor, irrigation system with storage tank, heating air blower for preheating working medium and maintaining preset temperature in closed volume, working medium discharge screw and heat-isolated bed with heated floor. Note here that intake bin allows separate feed of working medium elements. Besides, storage tank allows receiving solution of humic acid in water or solution of humic acid with bioagent in water. Also, heat-isolated bed comprises two layers with spacing there between communicated with heating air blower outlet.

EFFECT: higher efficiency and quality.

15 cl, 1 dwg