NovelPD/A processtotreat low C/N domestic wastewater and secondary effluent simultaneously
CHEN Kai-qi, ZHANG Liang, SUN Shi-hao, PENG Yong-zhen, JIATi-pei
National Engineering Laboratory for Advanced Municipal WastewaterTreatment and Reuse Technology, Key Laboratory of Beijing for Water Quality Science and Water Environment RecoveryEngineering, Beijing University of Technology, Beijing 100124, China
Anovelfixed-bed biofilm process based on partial denitrification/anammox (PD/A) was developed for the simultaneous treatment of low C/N domestic wastewater and secondary effluent. The nitrogen removal performance of the process at different influent C/N (1.3, 1.5, 1.6, 1.8) and different pH (7.5, 8.0, 8.5, 9.0) was studied. Results showed that increasing influent C/N enhanced the complete denitrification of the system, whichincreased the average removal rate of NO3--N from 52.3% to 85.7%; The higher influent pH promoted theNO2--N accumulation in partial-denitrification process, and then enhanced the autotrophic nitrogen removal by the anammox, which increased the average removal rate of NH4+-N from 82.2% to 89.7%. Under the conditions of C/N=1.6 and pH=9.0, 88.3% of TN removal rate was achieved, and the effluent TN was stable less than 2mg/L. Moreover, the potential of the fixed-bed biofilm process based on PD/Ain the upgrading of traditional AAO process was analyzed.
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