Research On Impact Of Ammonia Nitrogen Rush Load To A/A/O Technology And Its Control Measurement

With the development of economy and the speeding up of urbanization, municipal sewage treatment plant influent mixed with industrial wastewater, the influences on the impact of biochemical treatment system of wastewater treatment plant is more and more obvious.A/A/O process of municipal sewage treatment plant there is a big difficulty in dealing with the impact of ammonia concentration, the impact load caused by influent containing high concentration ammonia nitrogen directly affects the effect of nitrogen and phosphorus removal in A/A/O process,and affecting the normal operation of the sewage treatment system.Through experiment, this paper studied the effect of influent ammonia impact load on the A/A/O process of nitrogen and phosphorus removal effect, proposed control measures for A/A/O system to respond to the impact load of the ammonia. Through research and analysis, we can get to some conclusions:(1)When the A/A/O process is of high concentration ammonia nitrogen impact, ammonia nitrogen, total nitrogen and total phosphorus removal rate decreased, activated sludge settling performance decline, the effluent COD and SS concentrations increased.(2)The concentration of dissolved oxygen in aerobic tank is restricting factors influencing ammonia nitrogen removal effect, low C/N ratio and shortage of carbon source is the influence factors on nitrogen removal.(3)When the system is of high concentration ammonia nitrogen impact, the effluent p H value is lower than 6, not only affects the effluent discharge standards, also affects the activity of activated sludge.(4)There are two measures to deal with the influent ammonia impact load,extended aeration time and aerobic tank adding alkali,it can effectively improve the removal rate of ammonia nitrogen and p H value of effluent,the effluent can attain “Discharge standard of pollutants for municipal wastewater treatment plant(GB18918-2002)” grade ⅱstandards.This study can offer useful reference for operation management in municipal sewage treatment plant of A/A/O process.