YANG Ping,ZHOU Jia-zhong,GUAN Yong-jie,et al.Comparison of AAO and Bardenpho Processes Transformation Effect Based on MBBR[J].China Water & Wastewater,2021,37(7 7):11-19.
Comparison of AAO and Bardenpho Processes Transformation Effect Based on MBBR
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
7 7
Page:
11-19
Column:
Date of publication:
2021-04-01
- Keywords:
- MBBR; AAO process; Bardenpho process; nitrogen removal; suspended carrier; continuous upgrading
- Abstract:
- Moving bed biofilm reactor (MBBR) is an efficient biological nitrogen removal process, which is one of the most popular processes in the upgrading of wastewater treatment plant (WWTP). Based on the continuous upgrading of a WWTP in North China, actual operational performance of AAO and Bardenpho processes coupled with MBBR (named as MBBR-AAO process and MBBR-Bardenpho process, respectively) were analyzed. The nitrification capacities of MBBR-AAO and MBBR-Bardenpho processes were 0.158 kg/(m3·d) and 0.208 kg/(m3·d), respectively, which were much higher than that of the activated sludge process. Moreover, the MBBRBardenpho process had a stronger impact resistance and more stable effluent. TN concentrations in the effluent of the two processes were (20.9±3.8) mg/L and (7.4±2.3) mg/L, respectively, and their removal rates were 71.4% and 88.8%, respectively. The TN concentration in the effluent of the MBBR-Bardenpho process could be lower than 12 mg/L, which met the quasi class Ⅳ surface water standard and had an outstanding advantage in TN removal. The water quality analysis results along the process showed that, MBBR-Bardenpho process could further reduce the TN concentration in the effluent of the aerobic zone by adding an anoxic zone, which greatly improved the TN removal efficiency of the biochemical tank. Microbial communities of suspended carriers and activated sludge were detected by high-throughput sequencing. The suspended carriers had stronger enrichment ability for nitrifying bacteria, in which nitrifying bacteria was mainly responsible for nitrification and their relative abundance was more than 10%. However, relative abundance of denitrifying bacteria in activated sludge was higher than that in suspended carriers, and they were mainly responsible for denitrification. Footprints of the MBBR-AAO and MBBR-Bardenpho processes were 0.162 m2/(m3·d-1) and 0.136 m2/(m3·d-1), respectively. Based on the advantages of MBBR, the effluent standard can be further improved and the footprint per ton of water will be further reduced. Both processes can achieve good pollutants removal efficiency, in which MBBR-AAO is mainly applicable to WWTPs with conventional low substrate influent which meets the first level A standard, while Bardenpho process is suitable for WWTPs with effluent requirements of quasi class Ⅳ surface water standard and stricter standards.
Last Update:
2021-04-01