MATERIAL FOR BIOLOGICAL RECLAMATION OF DISTURBED SOILS Russian patent published in 2015 - IPC C09K17/40 

FIELD: chemistry.

SUBSTANCE: invention relates to environmental protection and specifically to biological reclamation of disturbed soils and recycling of industrial wastes. The material includes sludge from soda production and dehydrated excess active sludge and or a mixture of dehydrated excess active sludge and residue from primary settling tanks after treating urban household wastes. The dehydrated excess active sludge is a current output waste or a waste stabilised in natural conditions for 1-10 years, and has the following composition, wt %: organic substances - 49-67, mineral substances - 33-51, including total nitrogen of up to 5.7%, phosphorus of up to 7.4%. The sludge from soda production used has particle size of less than 0.5 mm and is obtained from centrifuging at a rate of 3800-4200 rpm and centrifuging time of 12-18 min with pH of aqueous extracts of 8.2-8.5. The weight ratio of the sludge from soda production to the dehydrated excess active sludge or mixture of dehydrated excess active sludge and residue from primary settling tanks is 2:1-1:1.

EFFECT: obtaining material for biological reclamation without limitation on the field of use, low cost of the material and wider range of resources for production thereof.

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