Multi stage waste treatment process

摘要

Waste disposal method, with sorting and homogenization of solid wastes, mixing solid organic wastes with liquids, thermal hydrolysis of wastes, ad anaerobic digestion, whereat wastes delivered to the station are divided into four groups: - solid wastes (1a), - liquid wastes (1b), - sewage sludge (1c) and - organic waste rich in carbon (1d), while solid wastes (1a) are subject to crushing and then split into the 3 fractions a) minerals, which are led directly to the municipal landfill (102); b) high-calorific fraction, which is directed to the incinerator (4); and c) biodegradable fraction; in which the biodegradable fraction c) is mixed with liquid wastes (1b) and/or purified sewage in tanks (8, 9), and the obtained pulp is sent to the thermal hydrolysis in a reactor (10); the sewage sludge (1c) is mixed with purified sewage from a tank (7) and preferably subject to pasteurization, the preferably pasteurized diluted sewage sludge and the substrate exiting the thermal hydrolysis reactor (10) are combined, with addition of excess sludge from a biological water purification stage - and subject to anaerobic digestion in chamber (11), followed by a sedimentation in chamber (13); the in the process of anaerobic digestion obtained biogas is sent to the current generator (103) and a low-calorie excess of biogas is directed to the burner of the incinerator (4), supporting waste incineration; the clear liquid obtained after sedimentation is led to a clear liquid tank (17) and/or tank (7) at the beginning of the process, while the post-sedimentation sludge is treated with coagulants and flocculants, and then filtrated, a part of the liquid from the clear liquid tank (17) is mixed with organic waste rich in carbon, i.e. the fourth waste group (1d), and is then subject to treatment in a biological treatment stage (18) using active sludge; a part of the active sludge from the biological treatment stage (18) is returned to the biological treatment stage and the excess is sent to the anaerobic digestion chamber (11); the liquid exiting the biological treatment stage (18) is subject to treatment in the chemical treatment station (19).