Working Principle

   Septic tank is kind of using precipitation and anaerobic fermentation principle was used to remove the primary treatment of sewage suspended solids in the organic matter to build a life sewage containing large amounts of excreta, scraps of paper, parasite and other impurities, the suspended solids concentration between 100~350mg/L. The suspension is organic BOD5 in 50-200mg/L. Sewage into the septic tank by 12-24h precipitation, removal of suspended solids 505-60%. Precipitated sludge through anaerobic digestion of more than 3 months, the  sludge organic matter decomposition into stable inorganic material, easy to corruption of raw sludge into stable ripe sludge, changing the structure of sludge, reducing the moisture content of sludge.