The Research On The Treatment Of Rich Ammonia Nitrogen Leachate With Combined MAP-SBBR Process

The combined technological process of MAP-SBBR-coagulating sedimentation was used for the young landfill leachate and the old landfill leachate, based on the analysis of the characteristic and existing treatment means of landfill leachate.When the MAP was used to treat the young and the old landfill leachate, the impact of different medicament teams were reviewed to remove the NH4+-N. The team of MgO and NaH2PO4 was choosen. At the same time, the reaction time,the whisking speed and the different magnesium salt mol ratio were reviewed to remove the NH4+-N and the organic matter. At last the best test condition was decided. The reaction time was 1h. The whisking speed was 150r/min. Mg:N:P is1.5:1:0.8. According to the best condition, the removal ration of CODCr and NH4+-N of the young landfill leachate were 22.4% and 82.3%. To the influent of SBBR, CODCr of the young landfill lachate was 3006mg/L and NH4+-N was 276mg/L.The old landfill leachate were 23.2% and 83.4%. To the influent of SBBR, CODCr of the old landfill leachate was 1339mg/L and NH4+-N was 179mg/L.The removal efficiency of organic matter and ammonia nitrogen of two series SBBR with different running means were studied, on condition that the treatment loading of each means was same. The results indicated that the SBBR with the running means of intermittent aerobic reaction had the highest nitrogen removal efficiency, since that it can remove a part of NOx--N created by nitrification duly. Combined with the rules of nitrification-denitrification and organic matter removal, the nitrogen and organic matter removal rules of SBBR were studied. Based this study the optimal running means of SBBR was determined. A day had two periods. In a period, the optimal feeding time was 1h. The aerobic reaction was two times. Each optima aerobic reaction time was 4 hours with DO among 2~4mg/L. In the middle of the two aerobic reactions, SBBR left unused for two hours.The optimal of settling and withdrawing time was 1h. In this condition, the effluent NH4+-N concentration of the young landfill leachate was less than 7mg/L and the removal ratio of CODCr was high than 90%. The effluent NH4+-N concentration of the old landfill leachate was less than 8mg/L and the removal ratio of CODCr was high than 80%..0Nitrite was generally the main product of nitrification in the process of biological treatment of landfill leachate in SBBR according to this experiment, and at the same time the removal ratio of total nitrogen was evident, which suggested the...