Short-cut Nitrification in A/O-MBR for Treatment of High-concentration Ammonia Nitrogen Wastewater

The A/O-MBR process was used to treat simulated high-concentration ammonia nitrogen pesticide wastewater,and the removal effect of ammonia nitrogen was investigated.The short-cut nitrification was implemented by controlling pH value,temperature and dissolved oxygen(DO),and the affecting factors were studied.When the temperature,pH value,influent ammonia nitrogen and DO were 25 to 28 ℃,7.5 to 8.5,120 to 1 500 mg/L and 2.5 mg/L respectively,the accumulation rate of nitrite nitrogen averaged 58.9%,and the removal rate of ammonia nitrogen averaged 93.2%.When DO was 1.5 mg/L and other conditions were unchanged,the accumulation rate of nitrite nitrogen was more than 90%,but the removal rate of ammonia nitrogen was reduced to 87.5%.