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A novel pilot-scale IFAS-MBR system with low aeration for municipal wastewater treatment: Linkages between nutrient removal and core functional microbiota
Science of the Total Environment ( IF 9.8 ) Pub Date : 2021-02-14 , DOI: 10.1016/j.scitotenv.2021.145858
Depeng Wang , Junshi Tao , Fuqiang Fan , Ronghua Xu , Fangang Meng

In this study, we proposed a novel IFAS-MBR with low aeration for the treatment of real municipal wastewater. With biocarriers packed in the anoxic tank, the pilot-scale IFAS-MBR operated with average dissolved oxygen concentrations of 0.56 mg/L in the oxic tank. Over 110 days of operation, highly efficient nutrient removal was achieved with the total nitrogen (TN) and phosphorus (TP) removal efficiencies of 78.1 ± 7.2% and 93.7 ± 5.8%, respectively. The average effluent concentrations of TN and TP reached 5.4 and 0.26 mg/L, respectively. Meanwhile, the removal efficiency of COD reached 95.3 ± 1.3% in the system, and the concentrations of COD decreased from 31.9 ± 3.7 (sludge supernatant) to 12.7 ± 1.6 mg/L (permeate) after membrane filtration. Microbial community analysis showed that Nitrosomonas (0.32%) and Nitrospira (1.85%) in activated sludge were the main drivers of the nitrification process, while various denitrifying bacteria in activated sludge and biofilms were responsible for nitrate reduction in the anoxic tank. Candidatus Accumulibacter (0.34%) and Dechloromonas (1.31%) primarily contributed to denitrifying phosphorus uptake in the anoxic tank. Furthermore, these organisms (i.e., core functional microbiota) exhibited stable levels over the entire operation. The highly enriched hydrolytic fermentation bacteria drove community succession, and the remarkable functional robustness of microbial communities in activated sludge and biofilms favored nutrient removal. Overall, the novel IFAS-MBR system provides an energy-efficient MBR alternative owing to its highly efficient performance and low operating costs enabled by low aeration rates and the absence of an external carbon source.



中文翻译:

低通气的新型中试规模IFAS-MBR系统用于市政废水处理:营养物去除与核心功能微生物群之间的联系

在这项研究中,我们提出了一种新型的低曝气IFAS-MBR,用于处理实际的城市废水。将生物载体装在缺氧罐中后,中试规模的IFAS-MBR在含氧罐中的平均溶解氧浓度为0.56 mg / L的情况下运行。在运行的110天中,实现了高效的养分去除,总氮(TN)和磷(TP)去除效率分别为78.1±7.2%和93.7±5.8%。TN和TP的平均出水浓度分别达到5.4和0.26 mg / L。同时,系统中COD的去除效率达到95.3±1.3%,膜过滤后COD的浓度从31.9±3.7(污泥上清液)降至12.7±1.6 mg / L(渗透液)。微生物群落分析表明,亚硝化单胞菌(0.32%)和硝化螺(1.85%)在活性污泥是硝化过程的主要驱动,而在活性污泥的各种反硝化菌和生物膜负责在缺氧罐硝酸盐还原。Accudulitus Accumulibacter(0.34%)和Dechloromonas(1.31%)主要有助于反硝化池中磷的反硝化吸收。此外,这些生物(即核心功能微生物群)在整个操作过程中表现出稳定的水平。高度浓缩的水解发酵细菌推动了群落演替,而活性污泥和生物膜中微生物群落的显着功能健壮性促进了营养的去除。总体而言,新颖的IFAS-MBR系统提供了节能的MBR替代方案,这是由于其高效的性能和较低的通气速率以及无需外部碳源而实现的较低运营成本。

更新日期:2021-02-25
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