Start-up characteristics of the pre-A2 NSBR Process
ZHAO Wei-hua, WANG Mei-xiang, LÜ Dong-mei, ZHANG Yong, PAN Cong, HUANG Yu, PENG Yong-zhen
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China
The start-up characteristics of the pre-A2 NSBR (anaerobic/anoxic/aerobic nitrification) system were investigated to treat low C/N municipal wastewater (C/N=3.85). The start-up of the system could be quickly achieved by the strategy that the A2 SBR and the N-SBR was first started separately then was operated jointly, the nitrification was well achieved in the N-SBR, and denitrifying phosphorus removal was realized in the A2 SBR with the NO3-N as the electronic accepter. The effluent quality index of COD、NH4+-N、TN、TP was 33.82mg/L、0.85mg/L、13.56mg/L、0.3mg/L, with corresponding removal efficiency was 84.31%、98.41%、76.81%、93.87%, respectively, which meet the first A discharge standard in china (GB 18918~2002) after continuous operation of 45days. FISH confirmed that PAOs was the dominant bacteria in the pre-A2 NSBR system and accounted for 14.77% of the total bacteria.
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