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Sewage through the sewage directly into the Trash after mechanical grid regulation pool, pool setting to adjust the quality of the purpose of regulation of water and sewage, to prevent the precipitation of suspended solids in the regulation pool, in the regulation of the bottom cloth perforated aeration tube, using a gap aeration.
Sewage higher organic ingredients, BOD5 / CODcr = 0.5, better biodegradability, and therefore a significant reduction in the use of biological treatment of sewage in the organic content is the most economical. Due to the higher water content of ammonia nitrogen and organic matter, especially organic nitrogen, in the biodegradable organic, organic nitrogen in ammonia form will show up, ammonia is also an important indicator of pollution control, sewage treatment and therefore the use of hypoxic aerobic A / O biological contact oxidation process, which is divided into A-level biochemical pool for an O-level pool and pool two parts. Regulate the use of sewage lift pump sewage tanks upgraded to A-level biochemical pool, biochemical treatment. A level in the pool, because the high concentration of organic matter in sewage, microorganisms in a hypoxic state, this time for the microbes and microorganisms, they will sewage organic nitrogen into ammonia, while the use of organic carbon as an electron donor, the NO2- -N, NO3 - N into N2, and also use part of the organic carbon and ammonia synthesis of new cellular material. So not only has a Class A pool of organic matter removal function, reduce the subsequent O-level biochemical pool of organic load, in order to facilitate nitrification, and rely on the high concentration of organic matter in sewage, complete denitrification, the eventual elimination of nitrogen eutrophication . After biochemical effects Class A pool, sewage is still a certain amount of organic matter and a high presence of ammonia nitrogen, in order to further oxidation and decomposition of organic matter, while the carbonation tends to be the case completely, nitrification can proceed smoothly, especially the O level biochemical pool.
A Level O-level tank effluent gravity into the pool, the process relies on O-level biochemical pool autotrophic bacteria (denitrifying bacteria) complete, they take advantage of decomposition of organic matter or inorganic carbon in the air to produce carbon dioxide as a nutrient source, sewage ammonia converted to NO2 - N, NO3 - N. Part of the O-level tank effluent into the sedimentation tank precipitation, the other returned to the A-level pool in the cycle in order to achieve the purpose of denitrification. At A-level and O-level biochemical pool are fitted with a filler, the whole process depends on biochemical attached to the filler to complete a variety of microorganisms. A dissolved oxygen level in the pool controlled 0.5mg / l or so; at O-level biochemical pool of dissolved oxygen control in 3mg / l or more, gas-water ratio 15: 1.
O-level biochemical pool water backflow into the Class A portion of the pool; part of the inflow vertical flow sedimentation tank, solid-liquid separation.
Sedimentation tank sludge settling down by the stripping means to lift part of the A-level pool, were circulating; to upgrade a portion of the sludge tank; the sludge pond sludge truck used regularly outside the operating agricultural fertilizer.