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First, the basic principle (1) The improved A / O staging water simultaneous nitrogen and phosphorus removal process achieves the advantages of simultaneous denitrification and phosphorus removal and the staged water intake itself. An anaerobic zone is added before the anoxic zone of the system to return the return sludge to the head of the anoxic zone and increase the internal return facility at the end of the anoxic zone to return the denitrified sludge to the anaerobic zone to ensure Effect of Anaerobic Sludge Concentration and Nitrate Nitrogen on Anaerobic Phosphorus Release. Q1 into the anaerobic zone into the water for anaerobic phosphorus release to provide adequate organic matrix, PHA will accumulate organic substrate in the form of PHA stored in vivo, when the anoxic zone D1 have sufficient electron acceptor nitrate , PHA stored by polyphosphate can directly act as the driving force for anoxic phosphorus uptake to achieve denitrifying phosphorus removal. The first paragraph of the anoxic zone water into the aerobic zone for nitrification, ammonia nitrogen into nitrate nitrogen, while polyphosphate bacteria can also use the remaining PHA continue to phosphorus. After the nitrification of sewage into the second paragraph, the third paragraph of hypoxia, aerobic zone in turn the reaction. (2) artificial ecological floating island technology. An artificial floating island is a floating island with aquatic plants or terrestrial plants that provide an ecological environment for wildlife. It is mainly composed of floating island matrices, plants and fixed systems. In the water body set up artificial floating island, floating island plant roots can absorb and absorb water nitrogen, phosphorus and other stored in plant cells. In addition, plant roots have a huge surface area, which is a carrier for the growth of microorganisms in water. Through the joint action of microorganisms, chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP) and heavy metal content of water can be reduced. Second, the key technologies (1) The establishment of three sections of A / O sub-inflow real-time control technology to achieve process automation. No need to add carbon source, aerobic tank simultaneous nitrification and denitrification, dissolved oxygen concentration control in 1.0 ~ 1.5mg / L, saving energy consumption of aeration. (2) Coupling with artificial floating island technology, a reasonable operation mode can be selected according to the pollutant concentration of influent: when the pollutant concentration is low, the sub-section influent process is used as the carrier of the artificial floating island without adding sludge, and aquatic The root system of the plant reaches the removal effect of the pollutants. When the pollutant concentration is high, the sludge is run by the segmented water inflow process. The plant root system can act as both a microbial carrier and a pollutant such as nitrogen and phosphorus. Third, the main equipment Pumps, sludge return pump, submersible mixer, aeration system, intelligent control system, power distribution cabinets. Fourth, operation and management (1) Intake pump room must strictly implement the inspection system, regularly observe the instrument display is normal, stable, whether the pump unit has abnormal noise or vibration, adjust the water level and so on. (2) According to the muddy water agitation and the mixing effect, the stirring effect of each anoxic section and the oxygenation effect of each aerobic section were judged respectively, and the SV measurement was performed every aerobic section once or twice a day. Fifth, environmental benefits Improve the environment, pollutants year reduction COD587t, TN76.3t, TP12t.