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首页> 外文期刊>Journal of Environmental Science and Health >Carbamazepine behaviour and effects in an urban wastewater MBR working with high sludge and hydraulic retention time
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Carbamazepine behaviour and effects in an urban wastewater MBR working with high sludge and hydraulic retention time

机译：卡马西平在高污泥和水力停留时间的城市废水MBR中的行为和影响

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The behaviour and fate of carbamazepine (CBZ) in urban wastewater treatment by a membrane bioreactor (MBR) and its possible effects on the system's efficiency, and on mixed microbial communities, has been studied. The experimental microfiltration MBR system, with capacity to treat 10.8 m(3) d(-1) of urban wastewater, operated with a pre-denitrification configuration with high sludge and hydraulic retention time. The CBZ concentration assayed was higher than in the usual urban wastewater, in order to provoke a strong biomass reaction. Influent, effluent, and all bioreactors of the MBR system were analysed in order to calculate a CBZ balance. Bench-scale experiments and respirometric analyses were performed, with and without the presence of CBZ, to evaluate its influence on the bacterial activity. The respirometric assays showed variations in the oxygen uptake rate (OUR) in the presence of CBZ. Negative effects were detected in the MBR bacterial community during the initial period of dosing. However, the effects were not permanent and the biomass spiked with CBZ had behaviour similar to that of the biomass without CBZ after a few hours. Biodegradation was not detected during the MBR treatment. The system showed an inefficient elimination of CBZ (less than 10%) with a high concentration in the effluent. The small percentage of CBZ removal was associated with the sludge retention and eliminated by the purge. All CBZ present in the influent was accounted for, and even an increase in the total amount of CBZ was registered in the permeate. During and after the experimental process, CBZ did not significantly affect the efficiency of the MBR system, and the quality of the effluent was not affected by the dosing of CBZ in terms of COD and nitrogen removal.
机译：研究了卡马西平（CBZ）在膜生物反应器（MBR）处理城市废水中的行为和命运，及其对系统效率和混合微生物群落的可能影响。实验性微滤MBR系统能够处理10.8 m（3）d（-1）的城市废水，采用预脱氮配置，高污泥和水力停留时间运行。为了引起强烈的生物质反应，所测定的CBZ浓度高于普通城市废水中的浓度。分析了MBR系统的进水，出水和所有生物反应器，以计算CBZ平衡。在有或没有CBZ的情况下进行基准规模的实验和呼吸测定分析，以评估其对细菌活性的影响。呼吸测定表明存在CBZ时氧气吸收率（OUR）发生变化。在最初给药期间，在MBR细菌群落中检测到负面影响。但是，这种影响不是永久的，几个小时后掺入CBZ的生物质的行为类似于不使用CBZ的生物质。在MBR处理期间未检测到生物降解。该系统显示出废水中高浓度的CBZ（小于10％）消除效率不高。少量的CBZ去除与污泥保留相关，并通过吹扫消除。解释了进水中存在的所有CBZ，甚至渗透物中的CBZ总量甚至有所增加。在实验过程中和之后，CBZ不会显着影响MBR系统的效率，并且废水的质量不受COB和脱氮方面的CBZ剂量影响。

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