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):11-19.
基于MBBR的AAO和Bardenpho工艺改造效果对比
- Title:
- Comparison of AAO and Bardenpho Processes Transformation Effect Based on MBBR
- Keywords:
- MBBR; AAO process; Bardenpho process; nitrogen removal; suspended carrier; continuous upgrading
- 摘要:
- 移动床生物膜反应器（MBBR）是一种高效的生物脱氮工艺，是污水厂提标改造的主流工艺之一。通过北方某污水厂的持续升级改造工程，分析了基于MBBR的AAO和Bardenpho工艺（分别记作MBBR-AAO工艺、MBBR-Bardenpho工艺）的实际运行效果。MBBR-AAO工艺和MBBR-Bardenpho工艺的实际硝化能力分别为0.158、0.208 kg/(m3·d)，远高于活性污泥法，而且MBBR-Bardenpho工艺的抗冲击能力更强、出水水质更稳定；两种工艺的出水TN浓度分别为（20.9±3.8）、（7.4±2.3） mg/L，对TN的去除率分别为71.4%和88.8%。MBBR-Bardenpho工艺可使出水TN低于12 mg/L，达到地表准Ⅳ类水质标准，在TN去除方面优势突出。沿程测定结果显示，MBBR-Bardenpho工艺通过增加后置缺氧区，可使好氧区出水TN进一步降低，大大提高了生化池对TN的去除效果。悬浮载体和活性污泥的高通量测序结果显示，悬浮载体对硝化菌的富集能力较强，相对丰度超过10%，主要起硝化作用；而活性污泥中反硝化菌的相对丰度较高，主要起反硝化作用。两种工艺的生化池占地分别为0.162、0.136 m2/(m3·d-1)，基于MBBR的优势，均可再次提标提量，吨水占地将进一步降低。两种工艺均有良好的除污效果，其中，MBBR-AAO工艺主要适用于常规浓度进水的一级A达标污水厂，而MBBR-Bardenpho工艺适用于出水水质要求达到地表准Ⅳ类及以上标准的污水厂。
- 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.
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