Laboratory Experiment Research And Application Of The A/O Biological Phosphorus Removal Technology

The eutrophication phenomenon of the water already became one of serious water environmental questions which the humanity faced, phosphorus content of the municipal wastewater approximately composed 34% of total phosphorus in the water body, therefore reduced the phosphorus content of the municipal wastewater is the main way of preventing eutrophication of the water body. In recent years, the country promulgated "Integrated Wastewater discharge Standard" (GB8978-1996) and "Discharge standard of pollutants for municipal wastewater treatment plant" (GB18918-2002) to stipulate the extremely strict phosphate discharged standard, therefore the municipal wastewater treatment plants have to consider phosphorus removal technology. From January 1, 1998, municipal wastewater plants mainly use the biological technology to removal of phosphorus.From the technological development, the technology of A2/O, the technology of A/O, the technology of oxidation ditch, the technology of SBR and so on. many technologies not only have function to eliminate the organic matter, also have the different function to removal of phosphorus and nitrogen, this subject mainly research biological removal of phosphorus effect through laboratory experiment. seeks the main movement parameter and influence factor of the the A/O system,The subject establishes a laboratory equipment, mainly research the rule about the directly domesticating active sludge and the vaccination domesticating active sludge of A/O system. It confirm the main running parameters and influence factors of the A/O biological phosphorus removal technology which fit inflow quality of Jizhuangzi wastewater plant. Accumulate running experiment of A/O technology. Discuss biological mechanism of removal of phosphorus according to the running status of the A/O biological removal of phosphorus of JZZ WWP. Concretely, it is through researching and analyzing and applying the subject, to improve removal rate of general phosphorus , BOD , COD , SS , ammoniac nitrogen. improve water quality of wastewater plant, cut down the occurrence frequency , reduce producing cost, raise operating efficiency of the A/O system of municipal wastewater plants .The findings indicates that:In the stable situation of A/O biological removal of phosphorus, the rate of removal of phophorus is much higher than traditional active sludge technology. The direct method of domesticating the active sludge lasted longer than the method of vaccination, the energy consumption is bigger; The direct method of domesticating the active sludge is more degree than the method of vaccination; The NOx-N content to be able to affect the phosphorus releasing in the Tiring-oxygen section, therefore it must reduce the NOx-N content of the water in the A/O pond inlet and the backflow sludge carries; Simultaneously studies indicates that, in the same time, keeping the effect of removal of Phosphorus, it can removal of ammoniac nitrogen through adjusting running parameter.