HYBRID THERMOPHILIC ANAEROBIC DIGESTION PROCESS FOR THE COMBINED TREATMENT OF FOOD-WASTE AND PIG-MANURE.

摘要

The present invention relates to a hybrid thermophilic anaerobic digestion process for combined treatment of food waste and pig manure. The hybrid thermophilic anaerobic digestion process comprises the steps of: pulverizing food waste and injecting to an acid decomposing chamber for hydrolysis; mixing the processed liquid with pig-manure and injecting to an anaerobic high temperature digester after modulating the concentration of hydrogen ions moderately; supplying biogas, produced by a methane fermentation, to Taihan electric wire net after generating power with the biogas by a CHP; stailizing the high temperature digested water in a middle temperature digester for being used as a liquid fertilizer. Existing processes comprise one reacting step, while the anaerobic digestion comprises two steps of: acid fermentation, methane fermentation. The anaerobic digestion is performed by setting optimal reaction conditions for the first acid decomposing chamber and the second anaerobic high temperature digester. The temperature for the methane fermentation has been performed at middle temperatures (37 deg. C), while the present invention chose high temperatures (57 deg. C) which has high efficiency. Hence, the methane convert ratio of organic matters is twice more, which leads less residual of organic ingredients and sterilization of disease-causing bacteria and removal of weed-seeds in the residual. The present invention filters the middle temperature digested water and makes the solid matters into fertilizers, the filtered liquid is reused as a liquid fertilizer by an organic method. [Reference numerals] (1) Left food waste 100; (10) Solid-liquid separator; (2) Select; (3) Grinder; (4) Acid decomposer; (5) High temperature digester; (6) Middle temperature digester; (7) Filter; (8) Liquid fertilizer; (9) Livestock waste water 200; (AA) Merging treatment flow chart; (BB) Organic matter20; (CC) Biogas 8,000M3/day 5,000Kcal/M3; (DD) CHP(13) 1,000Kw/h 5,000Mwh/year HEAT 900toe/year; (EE,FF) Adulteration; (GG) Solid matter; (HH) Sawdust; (II) Organic liquid fertilizer; (JJ) Organic compost; (KK) Organic farming