Simultaneous removal of domestic wastewater and nitrate wastewater by three-stage anammox system
HAN Ke-xin, ZHANG Qiong, FENG Yan, LI Xi-yao, PENG Yong-zhen
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China
Abstract：To further utilize carbon source, endogenous denitrification reactor (ED-SBR)、partial nitrification reactor (PN-SBR) and anammox reactor (AMX-UASB) were used to treat low C/N domestic wastewater and industrial wastewater rich in nitrate. The feasibility of simultaneous denitrification of domestic wastewater and nitrate wastewater was discussed. 77.5% of the organic matter in the influent could be converted into internal carbon source in the ED-SBR anaerobic stage, and endogenous denitrification was carried out in the anoxic stage. The average NO3--N concentration in the effluent was 3.4mg/L, reaching an average removal rate of 90.4%; PN-SBR can achieve stable half shortcut nitrification under low do (0.1~0.3mg/L), Nitrite Accumulation Ratio (NAR) is 96.3%, and the ratio of NO2--N/NH4+-N in effluent is about 1.01, which can provide stable substrate for anammox; AMX-UASB reduces NH4+-N and NO2--N in influent is converted to N2 and NO3--N. The average effluent of NO3--N was 7.12mg/L. The average TIN concentration of inlet and outlet water was 77.5 and 8.2mg/L respectively, and the average TIN removal rate was 89.2%. In order to couple domestic sewage with high NO3--N content, providing an effective way to remove nitrogen from wastewater simultaneously.
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