1, anaerobic biofilter: anaerobic biofilter, also known as anaerobic filters, is a filler equipped with a fully enclosed biological reaction device without oxygen, filler for the particle size of 30 ~ 50 mm gravel, pebbles, coke and various forms of plastic products or filled with soft or semi-flexible filler, paint layer can be attached to a large number of anaerobic microorganisms (i.e. common black anaerobic sludge) and form a biofilm, rural sewage continuously into the filter tank, through the filler with microorganisms, microorganisms can be absorbed degradation of organic substances in the water, so that the sewage is purified. There is a porous plate in the filter tank to support the filler and the role of uniform water distribution; the top of the filter tank is equipped with a U-type water seal, so that the biogas generated in the biofilter is discharged in a timely manner, and to maintain the complete anaerobic state of the filter tank.
2, contact oxidation bed: contact oxidation bed is also known as submerged aeration biofilter, the bed is filled with fixed filler or free movement of filler, all submerged in water. The filler is also attached to a large number of microorganisms, and the formation of a rich biofilm, the bottom of the aeration pipe, through the air compressor will be air compressed air into the bed, for aerobic microorganisms to provide the oxygen needed for survival. Rural sewage continuously enters the contact oxidation bed, and contact with microorganisms when passing through the filler layer, the microorganisms on the filler absorb and degrade the organic substances in the water, so that the sewage is purified.
3, sedimentation tank:
Sedimentation tank is a use of gravity, so that the contact oxidation bed effluent water specific gravity is greater than the water of suspended solids sink to the bottom of the tank, and make it separate from the effluent, so as to obtain the clarification of the water device. Sedimentation tank is mostly cone or bucket structure, in order to facilitate the settlement of suspended solids aggregation, small decentralized wastewater treatment system contact oxidation tank is connected to the bottom of the sedimentation tank, sedimentation sludge can be re-contact oxidation tank, do not have to set up another sludge return pipe.
4, filler film: filler film is the sludge will be cultured into the reactor, and contact with the filler, part of the bacterial colloid and a small number of bacterial interception attached to the surface of the filler, these intrinsic microorganisms will ingest nutrients in the wastewater, metabolism, and other life activities, and growth and reproduction on the surface of the filler, and gradually form a thin gelatinous mucous membrane, over time, microorganisms continue to grow, from the surface of the carrier to the outside. With the passage of time, the microorganisms continue to grow and spread outward from the surface of the carrier, gradually covering the formed membrane layer, forming a mature biofilm.