METHOD OF TREATING CELLULOSE-CONTAINING SEWAGE SLUDGE TO OBTAIN LINING CARDBOARD AND ETHANOL FROM CELLULOSE Russian patent published in 2020 - IPC C02F1/50 C02F1/76 C12P7/10 D21H21/36 A01N59/00 

FIELD: water treatment.

SUBSTANCE: invention relates to a method of treating a primary residue which is formed in water treatment plants, such as those included in a cellulose plant or a pulp and paper mill. Invention also relates to a method of using a primary precipitate for producing ethanol from cellulose and use of the treated primary precipitate to obtain recycled facing cardboard. Method of producing the primary precipitate involves a step of treating the outlet stream with a preserving agent which is a composition containing benzalkonium chloride, sodium hypochlorite and oxytetracycline.

EFFECT: reduction of biological decomposition of cellulose fibres in primary sediment, reduction of chemical oxygen consumption at the stage of secondary treatment.

8 cl, 1 dwg, 4 ex