Ning Chen, Xiaodong Wang, Mei Huang, Zakhar Maletskyi, Harsha Ratnaweera, Xuejun Bi
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引用次数: 0
摘要
摘要建立了多级厌氧/氧(A/O)多室移动床生物膜反应器(MBBR)处理城市污水系统。研究了中试多级MBBR反应器的有效生物量、生物活性和生物量产量。在不同温度条件下,采用呼吸法测定了各室微生物活性和异养产率系数(YH)。同时,将功能生物量的生长速率、硝化速率和反硝化速率也量化为比呼吸速率(SOUR)。在10-19℃条件下,好氧反应器的总活性生物量为0.71 ~ 1.68 g COD/m2,缺氧反应器的总活性生物量为0.39 ~ 1.44 g COD/m2。厌氧反应器的YH值为0.61 ~ 0.69,与活性污泥模型(ASM1)的推荐值相当。硝基螺旋体与自养特定呼吸速率(SOURA)的相关系数为0.82。反硝化属与异养特定呼吸速率(SOURH)和活性异养生物量(XH)呈极显著相关。该研究为多级MBBR系统的生物量分布和相应的动力学参数提供了依据,可为工艺设计和故障排除提供参考。
Quantitative study of biofilm yield and biomass distribution of a multi-stage moving-bed biofilm system
Abstract A multi-stage anoxic/oxic (A/O) moving-bed biofilm reactor (MBBR) system with multiple chambers was established for municipal wastewater treatment. The active biomass quantity, bioactivity, and biomass yield of a pilot-scale multi-stage MBBR were investigated in this study. The microbial activity and heterotrophic yield coefficients (YH) were measured using respirometric techniques in each chamber at different temperature conditions. Meanwhile, the growth, nitrification, and denitrification rates of functional biomass were also quantified as specific respiration rate (SOUR). The total active biomass in the multi-stage A/O-MBBR system was 0.71–1.68 g COD/m2 for the aerobic reactor and 0.39–1.44 g COD/m2 for the anoxic reactor at 10–19 °C. The YH values for the anoxic reactors were 0.61–0.69, which were comparable to the recommended value of the activated sludge model (ASM1). The correlation coefficient between Nitrospira and the autotrophic specific respiration rate (SOURA) was 0.82. Meanwhile, denitrifying genera showed a significant correlation with the heterotrophic specific respiration rate (SOURH) and the active heterotrophic biomass (XH). This study provided insights into biomass distribution and the corresponding kinetic parameters for the multi-stage MBBR systems, which may serve as a reference for process design and trouble shooting.