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Exploring the essential factors of performance improvement in sludge membrane bioreactor technology coupled with symbiotic algae.
Water Research ( IF 11.4 ) Pub Date : 2020-05-10 , DOI: 10.1016/j.watres.2020.115843 Li Sun 1 , Jinxing Ma 2 , Lipin Li 3 , Yu Tian 3 , Zhong Zhang 4 , Huaiyu Liao 4 , Jibin Li 4 , Wangwang Tang 5 , Di He 6
Water Research ( IF 11.4 ) Pub Date : 2020-05-10 , DOI: 10.1016/j.watres.2020.115843 Li Sun 1 , Jinxing Ma 2 , Lipin Li 3 , Yu Tian 3 , Zhong Zhang 4 , Huaiyu Liao 4 , Jibin Li 4 , Wangwang Tang 5 , Di He 6
Affiliation
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In this study, a coupled system of algal-sludge and membrane bioreactor (AS-MBR) was established for fouling control, and meanwhile the performance of wastewater treatment was enhanced. Results indicated that the AS-MBR increased the COD, NH4+-N, TN and PO43- -P removal efficiencies from 91.7% to 95.9%, 90.8%-96.9%, 22.0% to 34.3% and 18.4%-32.6%, respectively. Further analysis suggested that in the AS-MBR, the total specific oxygen utilization rate (SOUR), the SOUR of ammonia oxidizing bacteria and the SOUR of nitrite oxidizing bacteria were 26.6%, 58.5% and 52.4% higher than the control, respectively, indicating the improvement of microbial activities in AS-MBR. Additionally, the membrane fouling rates in the AS-MBR were 52.6% and 32.2% lower than the control in the slow and rapid fouling processes, respectively. A further mechanism investigation demonstrated that the concentrations of extracellular polymeric substance (EPS) were decreased by 19.8% and 22.1% in the mixed liquid and the fouling layer, respectively, after the inoculation of algae, which was expected to have a positive effect on the higher permeability and longer operation cycle of the membrane in the AS-MBR. More regular floc morphology was observed for the fouling layer on the membrane of AS-MBR, with the polysaccharides and proteins forming large clusters and channels in the fouling layer that likely decreased the filtration resistance. Consequently, high-throughput sequencing analysis revealed that the microbial community in the AS-MBR had higher abundances of bacteria and algae related to nutrients and organic matters degradation, which was beneficial for the improvement of wastewater treatment and alleviation of membrane fouling.
中文翻译：
探索与共生藻类结合的污泥膜生物反应器技术性能提高的基本因素。
在这项研究中，建立了藻类污泥和膜生物反应器（AS-MBR）的耦合系统，用于结垢控制，同时提高了废水处理的性能。结果表明，AS-MBR分别将COD，NH4 + -N，TN和PO43--P的去除效率从91.7％提高到95.9％，90.8％-96.9％，22.0％增加到34.3％和18.4％-32.6％。进一步的分析表明，在AS-MBR中，总比氧利用率（SOUR），氨氧化细菌的SOUR和亚硝酸盐氧化细菌的SOUR分别比对照高26.6％，58.5％和52.4％，表明AS-MBR中微生物活性的改善。另外，在慢速和快速结垢过程中，AS-MBR中的膜结垢率分别比对照低52.6％和32.2％。进一步的机理研究表明，接种藻类后，混合液和污垢层中胞外聚合物（EPS）的浓度分别降低了19.8％和22.1％，这有望对藻类产生积极影响。 AS-MBR中膜具有更高的渗透性和更长的操作周期。AS-MBR膜上的污垢层观察到更规则的絮状形态，多糖和蛋白质在污垢层中形成大簇和通道，可能会降低过滤阻力。因此，高通量测序分析表明，AS-MBR中的微生物群落具有与营养物质和有机物降解相关的细菌和藻类丰富度，
更新日期：2020-05-10
中文翻译：
探索与共生藻类结合的污泥膜生物反应器技术性能提高的基本因素。
在这项研究中，建立了藻类污泥和膜生物反应器（AS-MBR）的耦合系统，用于结垢控制，同时提高了废水处理的性能。结果表明，AS-MBR分别将COD，NH4 + -N，TN和PO43--P的去除效率从91.7％提高到95.9％，90.8％-96.9％，22.0％增加到34.3％和18.4％-32.6％。进一步的分析表明，在AS-MBR中，总比氧利用率（SOUR），氨氧化细菌的SOUR和亚硝酸盐氧化细菌的SOUR分别比对照高26.6％，58.5％和52.4％，表明AS-MBR中微生物活性的改善。另外，在慢速和快速结垢过程中，AS-MBR中的膜结垢率分别比对照低52.6％和32.2％。进一步的机理研究表明，接种藻类后，混合液和污垢层中胞外聚合物（EPS）的浓度分别降低了19.8％和22.1％，这有望对藻类产生积极影响。 AS-MBR中膜具有更高的渗透性和更长的操作周期。AS-MBR膜上的污垢层观察到更规则的絮状形态，多糖和蛋白质在污垢层中形成大簇和通道，可能会降低过滤阻力。因此，高通量测序分析表明，AS-MBR中的微生物群落具有与营养物质和有机物降解相关的细菌和藻类丰富度，
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