Influence mechanism of filling ratio on solid-phase denitrification with polycaprolactone as biofilm carrier
文献类型： 外文期刊
作者： He, Xin 1 ; Zhang, Shiyang 1 ; Jiang, Yinghe 1 ; Li, Meng 1 ; Yuan, Julin 2 ; Wang, Guangjun 3 ;
作者机构： 1.Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China
2.Zhejiang Inst Freshwater Fisheries, Agr Minist, Key Lab Fish Hlth & Nutr Zhejiang Prov, Key Lab Healthy Freshwater Aquaculture, Huzhou 313001, Peoples R China
3.Chinese Acad Fishery Sci, Minist Agr & Rural Areas, Pearl River Fisheries Res Inst, Key Lab Recreat Fisheries, Guangzhou 510380, Peoples R China
关键词： Solid-phase denitrification; Polycaprolactone; Filling ratio; Carbon balance analysis; Microbial community
期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：9.642； 五年影响因子：9.237 ）
ISSN： 0960-8524
年卷期： 2021 年 337 卷
页码：
收录情况： SCI
摘要： In this study, three up-flow fixed-bed bioreactors were constructed with three different filling ratios (filling volume/effective volume: 30%, 60% and 90%) of polycaprolactone (PCL). Above 98% of nitrate removal efficiency was achieved with low accumulations of nitrite and ammonium for each filling ratio. Low filling ratio of PCL had extensive folds and pores that favored the attachment and growth of microorganisms; however, excessive biomass restrained nitrate specific reduction rate (NaSRR). The most dominant genera were Comamonas (0.80-57.64%), Stenotrophomonas (2.59-54.39%), Acidovorax (7.32-23.55%), Allorhizobium-Neorhizobium-Pararhizobium-Rhizobium (0.30-19.74%) and Thermomonas (0.12-14.58%). Nitrate reductase (EC 1.7.99.4), nitrite reductase (EC 1.7.2.1) and nitric oxide reductase (EC 1.7.2.5) predicted by PICRUSt2 were abundant in high influent nitrate load (NaL). According to the analysis of carbon balance model, the utilization rate (eta) of PCL showed a highly positive correlation with influent NaL, indicating reducing filling ratio or HRT might be an effective measure to save cost for nitrate removal.
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