Industrial sewage biochemical treatment technology

　　● Pretreatment system: including grille, sewage lifting pump, aerated sand settling tank and primary settling tank, etc. After the sewage manager processes it, it flows into the aerated biological filter by natural water level difference.

　　● Multi-stage aerated biological filter: The wastewater from different levels of aerated biological filters and biological carriers at different levels are not of the same quality, and the composition of the formed microbial populations is different. Each level is grown with water quality suitable for the wastewater flowing to this layer. Microbial flora.

　　● After-treatment system: The high-efficiency air floatation replaces the traditional secondary sedimentation tank. The sludge is directly discharged into the sludge tank for storage. After digestion, it is processed in a belt compressor or vortex centrifuge. The mud cake is transported outside or used as agricultural fertilizer. .

　　Technical key

　　Use aerated biological filters instead of ordinary biological ponds. The aerated biological filter adopts forced aeration with sufficient oxygen supply. The volume load of the aerated biological pool can reach 2 ~ 10kgCOD / m3.d, and the processing capacity per unit volume is about 10 times that of the ordinary biological filter.

　　The addition of different filter materials makes the unit filler have anaerobic, anoxic and aerobic zones at the same time, which is conducive to the formation of the food chain, and can also have the functions of denitrification, phosphorus removal and organic matter removal under aerated conditions.

　　The use of air floatation tanks instead of sedimentation tanks in traditional water treatment processes can greatly improve the removal rate of aging and falling off biological membranes and suspended matter in aerated biological filters, which can reduce hydraulic retention time, reduce the area of structures, and reduce civil investment.