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Septic tank is a kind of primary treatment structure that uses the principle of precipitation and anaerobic fermentation to remove suspended material organic matter in domestic sewage. Domestic sewage contains a large amount of feces, paper scraps, pathogens and other impurities, suspended solid concentration is 100-300mg/L, organic concentration BOD5 is 100-400mg, among which suspended organic compound BOD5 is 50-200mg/L. After sewage pour into the septic tank, 50%-60% of the suspended solids will be removed in 12-24 hours of precipitation. Precipitated sludge, after more than three months of anaerobic digestion, the decomposition of organic matter in sludge turn into stable inorganic, perishable raw sludge into stable ripe sludge, changed the structure of the sludge, and reduces the moisture content of sludge,periodic cleaning and outbound regularly, landfill disposal or used as fertilizer.