METHOD FOR CLEANING AND RECOVERING OF MECHANICALLY DEHYDRATED AND THERMOPHILICALLY FERMENTED SEWAGE SEDIMENTS Russian patent published in 1997 - IPC

FIELD: agriculture, in particular, utilization of sewage water sediments as organic-mineral fertilizer. SUBSTANCE: method involves applying mechanically dehydrated and thermophilically fermented sewage sediments with increased content of heavy metals to soil adapted for basic tillage for fodder and fodder-grain crops in doses set in accordance with nitrogen and heavy metal content in sewage sediments. Sewage sediments are applied into soil for depth of 25-27 cm (fodder crops) and for depth of 20-22 cm (fodder-grain crops) in doses additionally corrected on account of background and maximum admissible content of heavy metals in soil. EFFECT: increased efficiency, simplified method and improved quality of soil. 6 tbl