NOVELTY - Sedimentary deposits from a town septic tank are sent to a closed anaerobic fermenting tank, and mixed with liquid human excreta. pH Value of the fermented materials is regulated to 7.2-7.4, and mixed with industrial circulating cooling water. First generation fermentation is carried out, 1/3 of fermenting liquid is removed, and remaining is divided and displaced into two fermenting tanks. Sedimentary deposits are added for second generation culture and fermentation. n-Generation strain enrich culture is carried out to generate 2(power)n strains.    USE - Anaerobic fermentation of sedimentary deposits in septic tank.    ADVANTAGE - The method is eco-friendly and energy-efficient, improves gas-generation efficiency, reduces sewage discharge, and shortens decomposition period.    DETAILED DESCRIPTION - Sedimentary deposits from a town septic tank are taken as materials having total solids (TS) of 13-17%, and impurities are removed using a roller vibrating sieve. The deposits are sent to a closed anaerobic fermenting tank, liquid human excreta from septic tank with TS of 0.1-2% is added, TS is regulated to 8-10%, and the contents are mixed uniformly. pH Value of the fermented materials is detected and regulated to 7.2-7.4 with supernatant fluid of clear lime water. The materials are mixed with industrial circulating cooling water at 60-80 degrees C, to 55 degrees C, maintaining the flux. A water bath condition is provided for the fermenting tank, feeding the regulated circulating water at 55 degrees C from the lower portion of the intermediate layer of the fermenting tank and flowing out from the upper portion. First generation fermentation is carried out while mixing, and gas-generation amount and content of methane in biogas are recorded. Mixing is stopped before the methane yield is reduced. 1/3 Volume of the fermenting liquid is removed from the first-generation fermenting tank, and the remaining liquid is divided into two equivalent portions and displaced into two fermenting tanks as the strain. Sedimentary deposits are added in a volume of 2/3 of the fermenting liquid, and TS is regulated to 8-10% and pH to 7.2-7.4 for second generation culture and fermentation at 55 degrees C. n-Generation strain enrich culture is carried out to generate 2(power)n strains. The materials are fed into a normal gas generating step when the enriched strain meets the full-load operation of the fermenting tank. Mixing is stopped before the fermenting generated gas reaches the inflection point. 2/3 Volume of the fermenting liquid is taken for organic fertilizer production, and the remaining 1/3 is taken as strain for fermentation and biogas generation. The gas is fed into a biogas collecting column. The generated biogas is washed with water, desulfurized, dried, and stored in a tank. 2/3 Volume of the fermenting liquid is taken into a full-automatic slag-liquid centrifugal dehydrating system for solid-liquid separation. The separated marsh slag is dried in a drier, batched into an organic fertilizer production line, granulated, and dried to obtain an organic fertilizer, which is packed in bags for sale. The separated marsh liquid is combined, and the supernatant fluid is converted into biotic pesticide and the lower turbid liquid into canned liquid fertilizer.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of anaerobic fermentation of sedimentary deposits in septic tank. (Drawing includes non-English language text)