Sewage treatment equipment 1, buried below the surface equipment above the surface can be used as green or other land, not housing, and heating and insulation. 2, two biological contact oxidation process are used plug-flow biological contact oxidation treatment is better than full hybrid or two series completely mixed biological contact oxidation pond. And the ratio of the activated sludge tank and small size, strong adaptability to water quality, good resistance to shock loading performance, water quality and stability, no sludge expansion. Pool using the new three-dimensional elastic filler, surface area, easy to hang microbial film, stripping, organic load in the same conditions, the removal efficiency of organic matter, can increase oxygen in the air solubility in water. 3, biochemistry biological contact oxidation pond, its filler volume loading is relatively low, the microorganisms are self-oxidation step down, producing less sludge, only three months (90 days) above a row of mud (with dung suction or dehydrated cake Sinotrans). 4, deodorant way buried sewage treatment equipment in addition to conventional high-altitude exhaust, comes with a soil deodorization measures. 5, the entire device processing system with a fully automatic control system and electrical equipment failure alarm system, safe and reliable operation, usually generally do not need special management, just timely maintenance and repair of equipment.