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How to cost-effectively handle decentralized sewage pollution has become solve the major problems facing the crisis. The research and development of integrated water treatment equipment alternating flow is improved by a number of cycles in the gas stream composite media filter baffled by way of standard cells in series biofilm reactor, which combines biological aerated filter, gas enhance the circulating fluidized bed, fold-flow reactor and other process in one, with unique working principle and process characteristics. Normal operation of the reactor will be alternating aerobic, anoxic, anaerobic three environments, truly simultaneous nitrification and denitrification, achieved in a single reactor treating domestic wastewater to simultaneously achieve carbon nitrogen effect. This topic contains three main parts: the first part of the experiment on the alternating flow through the integration of water treatment equipment and hydraulic characteristics of the fluid dynamics were studied; second part of the sewage through pilot trials to study the water quality, water retention time (HRT), air-water ratio and other factors on the treatment effect of the reactor, and further examines the integration of water treatment equipment alternating flow of factors of each unit changes along the way, compared Split influent and DC-in two modes reactor influent organic matter and nitrogen removal effect; third part, Maanshan People's Hospital sewage treatment engineering practice, study the actual integration of water treatment equipment decontamination capabilities. The results show that the decision of the superficial gas velocity inside the reactor gas holdup size. Gas holdup and liquid circulation velocity, cyclic driving force, the oxygen mass transfer coefficient is proportional to the cycle time is inversely proportional to the liquid; liquid circulation velocity and the ceramic filter layer is inversely proportional to the height, and under its influence. Both completely mixed reactor reactor (CSTR) and a plug-flow reactor (PFR) flow state characteristics, determine the integration device has excellent performance of water treatment processes. In a pilot reactor during operation found adaptable to different water quality, COD, and NH 3 -N average removal rate of 90%. Considering the removal and economic reasons, hydraulic retention time (HRT) of 4 hours, air-water ratio of 4:1 is ideal reactor operating parameters. Alternating aeration mode ensures that the same reactor aerobic, anoxic partition runs, integration equipment Baffled construction along the way so that each unit of biomass, COD, NH 3 -N, TN such gradients obvious impact resistance ability, water quality and stability. Water diversion design an effective solution to the problem of insufficient denitrification carbon source, under the same conditions than the influent COD removal efficiency of the DC high of 4.9%, 7.4% nitrogen removal efficiency, improve the equipment to go carbon-nitrogen removal capability. Engineering Practice has proved that alternating current integrated water treatment equipment adaptability to different water quality, pollutant removal efficiency, water quality and stability, less investment, low operation cost, compact, can be widely applied to distributed or independent settlements , hotels, resorts, restaurants and other aspects of sewage treatment.
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