Tang Kai, Rosborg Peter, Rasmussen Emma S, Hambly Adam, Madsen Michael, Jensen Niels M, Hansen Aviaja A, Sund Christina, Andersen Heidi G, Torresi Elena, Kragelund Caroline, Andersen Henrik R
Department of Environmental Engineering, Technical University of Denmark, Miljøvej 113, 2800 Kgs. Lyngby, Denmark.
Department of Chemistry and Biotechnology, Danish Technological Institute, Kongsvang Allé 29, DK-8000 Århus C, Denmark.
J Hazard Mater. 2021 Feb 5;403:123536. doi: 10.1016/j.jhazmat.2020.123536. Epub 2020 Jul 24.
Moving bed biofilm reactors (MBBRs) were placed at two wastewater treatment plants, where they were constantly fed with effluent and intermittently fed with primary wastewater. Each reactor was subjected to different feast/famine periods and flow rates of primary wastewater, thus the different organic and nutrient loads (chemical oxygen demand(COD), ammonium(NH4-N)) resulted in different feast-famine conditions applied to the biomass. In batch experiments, this study investigated the effects of various feast-famine conditions on the biodegradation of micropollutants by MBBRs applied as an effluent polishing step. Rate constants of micropollutant removals were found to be positively correlated to the load of the total COD and NH4-N, indicating that higher organic loads were favourable for the growth of micropollutant degraders in these MBBRs. Rate constant of atenolol was five times higher when the biomass was fed with the highest COD and NH4-N load than it was fed with the lowest COD and NH4-N load. For diclofenac, mycophenolic acid and iohexol, their maximum rate constants were obtained with feeding of COD and NH4-N of approximately 570 mgCOD/d and 40∼60 mgNH4-N/d respectively. This also supports the concept that co-metabolism (rather competition inhibition or catabolic repression) plays an important role in micropollutants biodegradation in wastewater.
移动床生物膜反应器（MBBR）被放置在两个污水处理厂，在那里它们持续接收出水，并间歇接收原废水。每个反应器经历不同的 feast/famine 周期和原废水流量，因此不同的有机和营养负荷（化学需氧量（COD）、铵（NH4-N））导致应用于生物量的 feast-famine 条件不同。在批次实验中，本研究调查了各种 feast-famine 条件对作为出水抛光步骤的 MBBR 去除微污染物的生物降解的影响。发现微污染物去除的速率常数与总 COD 和 NH4-N 的负荷呈正相关，表明较高的有机负荷有利于这些 MBBR 中微污染物降解菌的生长。当生物量接受最高 COD 和 NH4-N 负荷时，阿替洛尔的速率常数比接受最低 COD 和 NH4-N 负荷时高五倍。对于双氯芬酸、霉酚酸和碘海醇，分别在 COD 和 NH4-N 进料约为 570 mgCOD/d 和 40∼60 mgNH4-N/d 时获得它们的最大速率常数。这也支持了共代谢（而非竞争抑制或分解代谢阻遏）在废水中微污染物生物降解中起重要作用的概念。
