The material of buried integrated wastewater treatment can be reinforced concrete structure or steel structure, can also be made into fiberglass. Buried integrated wastewater treatment equipment in the AO biological treatment process using push-flow biological contact oxidation tank, which is superior to fully mixed or two or three tandem fully mixed biological contact oxidation tank. And it is smaller than the activated sludge tank, strong adaptability to water quality, good impact resistance, stable effluent water quality, will not produce sludge expansion. At the same time in the biological contact oxidation tank using a new type of elastic three-dimensional packing, which has a large actual surface area, microbial film, easy to remove the film, in the same organic load conditions, than other fillers on the removal of organic matter is high, and can improve the oxygen in the air in the water solubility. Due to the use of biological contact oxidation tank in the AO biological treatment process, the volume load of the filler is relatively low, the microorganisms are in their own oxidation stage, so the amount of sludge production is less.
In addition, the water content of the sludge produced by the biological contact oxidation tank is much lower than that of the sludge produced by the activated sludge tank. Therefore, the sewage produced by the WSZ-AO series of integrated sewage treatment equipment is less sludge. The buried integrated sewage treatment equipment is equipped with fully automatic electrical control system and equipment damage alarm system, the equipment is reliable, so there is no need for special management, only the monthly quarterly maintenance and repair. Conditioning tank: WSZ-AO series conditioning time is 8 hours. Primary sedimentation tank: WSZ-AO series primary sedimentation tank is flat sedimentation tank, surface load is 1.5m3/. Class A biological tank: WSZ-AO series Class A biological tank is push-flow anaerobic biochemical tank, the residence time of sewage in the tank is 3 hours, filler is elastic three-dimensional filler, the specific surface area of filler is 200m2/m3. Class O biological tank: WSZ-AO series Class O biological tank is push-type biological contact oxidation tank, the sewage in the pool of biological contact oxidation, the sewage in the pool of biological contact oxidation, the sewage in the pool of biological contact oxidation, the sewage in the pool of biological contact oxidation and the sewage in the pool of biological contact oxidation. Contact oxidation, sewage retention time in the pool for 5-6 hours, filler for the elastic three-dimensional filler, filler specific surface area of 200m2/m3.