Study On Simultaneous Nitrogen And Phosphorus Removal In IBGS-SBR

Water is an indispensable element of life. With the rapid development of China's industrial and agricultural production, gradual speeding-up process of urbanization and people's living standards, water and sewage emissions have increased dramatically. Lacking of effective sewage treatment and rational water resources management, resulting in deterioration of China's most water quality, even aquatic ecosystems had been deteriorated, and water pollution problems have become more prominent. At present, water shortage and irrational usage, in turn, have become socio-economic development constraints. To exclude nitrogen, phosphorus and other nutrients from domestic sewage, we must rely on advanced treatment of sewage, explore more efficient nitrogen and phosphorus removal which is the current focus and difficult in the field of new technology.The disadvantages of existing simultaneous nitrogen and phosphorus removal technology include numerous structure combinations, high energy consumption, difficulty in operation, the substrate competition between microorganisms, sludge age of different lengths, which make it difficult to achieve high efficiency in simultaneously nitrogen and phosphorus removal. The study designed a IBGS-SBR simultaneous nitrogen and phosphorus removal system, at the advantages of sequencing batch operation mode, floating suspended carrier and granular sludge.The results showed that:in use of higher temperatures and lower dissolved oxygen control, the system could quickly realize high nitrite accumulation, and COD, ammonia nitrogen removal rates stayed between 88.1-92.7% and 95.0-96.1%; real-time control, namely the use of DO and pH regular changes in activated sludge operation to reflect the biological process of nitrification played a profound role in maintaining short-cut nitrification; due to oxygen supply in fixed mode, the stable short-cut nitrification changed into complete nitrification in only 40 cycles. In the artificial membrane mode, ZH new efficient suspended carrier of nitrification bacteria would be the best stuffing for IBGS-SBR system. Through the adjustment of water distribution, the research achieved a phosphorus accumulating enrichment, and completed the granular process., so that The system of denitrifying phosphorus bacteria were enriched and became dominant strain in two stages of anaerobic-anoxic-aerobic and anaerobic-oxygen.After all preparation work, the IBGS-SBR reactor designed to install and readjust. The results showed that the operating mode (upper aerobic and bottom anoxic) has a significant advantage at the overall process operation, reaction time and energy. Compared with the anaerobic-aerobic-anoxic operating mode, it still occupied a slight advantage, with the ammonia nitrogen removal rates of 83.4%-98.7%, and that of phosphorus 75.0%-86.7%. Faced with actual operation of the problems, some adjustments put into practice in time would help to achieve a better simultaneous nitrogen and phosphorus removal.