METHOD OF MAKING COMPOST FROM SEWAGE SLUDGE USING PHOTOTROPHIC BACTERIA Russian patent published in 2013 - IPC C05F11/08 C05F7/00 

FIELD: chemistry.

SUBSTANCE: invention relates to public utilities and environmental biotechnology and can be used for bioconversion of sewage sludge with low content of heavy metals combined with brewery wastes - spent grains - into compost. The method involves mixing in a defined volume ratio dry sewage sludge with an organic component in form of spent grains and with a cellulose-containing component in form of saw dust, adding a compost ferment in amount of at least 15% of the volume of the mixture and subsequent aerobic composting of the mixture. After the high-temperature composting step, natural drying of the mixture which is placed in a layer of about one metre, is carried out while simultaneously adding a bioactivator in form of a liquid culture containing 10⁹-10¹⁰ cells per ml of a suspension of anoxic purple phototrophic bacteria Rhodobacter capsulatus in volume ratio to the mixture of at least 1:50, respectively, and holding without compulsory aeration for 25-30 days, followed by stabilisation of the mixture in piles for 30-35 days.

EFFECT: inventions accelerates maturation and improves the quality of the compost by activating microbial succession and enhancing anti-fungal properties of the compost, improved sanitary-bacteriological and agrochemical properties, low cost of the end product.

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