Suspended Filler A~2/O Process Of Domestic Sewage Treatment

Water issues become more prominent,and understand more about environmental pollutants,people not only treat the chemical oxygen demand (COD), biochemical oxygen demand (BOD5) and suspended solids (SS) as a target,but also inorganic nutrients such as nitrogen, phosphorus removal, gradually become a key areas.My country has established stringent sewage standards. Some areas have even more stringent local emission standards.A2/O process is a mature technology, it has been widely used because of it's advantages, but there are still many drawbacks. In order to improve and solve the conflicts and processing efficiency of conventional A2/O, promote of traditional A2/O research and development, sewage treatment could be more widely used.This experiment chose artificial wastewater, traditional A2/O process combined with suspended biofilm carrier, through continuous simulation experiment, study the running mechanism with carrier on A2/O. On this basis, investigated a variety of external factors and parameters influence on suspended filler type A2/O.Suspended filler type A2/O reactor start using activated sludge method,and hanging film for two aerobic reactor,biofilm culture about 10 days, COD influent 310mg/L, COD effluent can be steady at 49mg/L, about 80% removal efficiency and increased steadily. During reactor startup, has done a lot of the biological phase of observation and detection of water-related indicators.Suspended filler A2/O reactor start a month later into the stable period,pH at 6.9-7.3,HRT remained at 8h,temperature around 22℃,influent COD concentration of 300-350mg/L, COD effluent can be steady at 28.4mg/L, handled up to 90%; influent ammonia nitrogen concentration between 26.7mg/L-41.2mg/L,effluent be maintained between the 0.3mg/L-4.7mg/L, stability in 4.2mg/L,deal with a maximum up to 98%; influent concentration of phosphate in the 3.5mg/L, TP effluent can be stabilized below 0.43mg/L, the minimum can reach 0.37mg/L,removal over 88%, up to 90%. Suspended filler A2/O reactor effluent COD, ammonia nitrogen and TP were to reach national emission standards A, to achieve the desired effect before the experiment. Observed from the reactor pH(6 phase) that pH decreased first and then gradually increased,after the rapid increase in changes of the last reduction when the water through the reactor pool.On this basis, studied the pH, HRT on reactor parameters. After a series of comparative tests, large amounts of data show that the suspended filler A2/O reactor was removal best in the neutral pH environment, acidic or slightly alkaline environment will suppressed the removal;and removal rate of rising with HRT, when the HRT=8, the rate stabilized, HRT continue to increase the removal rate of increase gradually decreased, accompanied by decreased.