Use of glass fiber reinforced plastic septic tanks is a principle of sedimentation and anaerobic digestion to remove suspended organic compounds in sewage treatment facilities, transitional living are the primary treatment tank. Sewage contains large amounts of manure, litter, insect pathogens, the solid concentration of suspended solids 100 ~ 350mg / L, BOD5 concentration of organic matter in the 100 ~ 400mg / L, which contained suspended BOD5 concentration of organic matter is 50 ~ 200mg / L. Sewage into the septic tank through the precipitation of 12 ~ 24h, can remove 50% to 60% of the suspensions. Sludge settling down more than 3 months after anaerobic digestion, decomposition of organic matter in the sludge into a stable inorganic, perishable raw sludge into a stable mature sludge, changed the structure of the sludge, reducing the moisture content of sludge. Periodic sludge Qingtao Sinotrans, landfill or used as fertilizer.