Effect of hydraulic retention time on denitrification performance and microbial communities of solid-phase denitrifying reactors using polycaprolactone/corncob composite

文献类型： 外文期刊

第一作者： Cui, Hongwu

作者： Cui, Hongwu;Feng, Yuna;Lu, Weibin;Li, Hao;Teng, Yu;Bai, Ying;Qu, Keming;Song, Yingying;Cui, Zhengguo;Cui, Hongwu;Wang, Lu;Li, Hao;Bai, Ying;Qu, Keming;Cui, Zhengguo;Lu, Weibin;Teng, Yu;Song, Yingying

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关键词： Polycaprolactone/corncob composite; Solid -phase denitrification; Hydraulic retention time; Bacterial community

期刊名称：MARINE POLLUTION BULLETIN （ 影响因子：5.3； 五年影响因子：6.1 ）

ISSN： 0025-326X

年卷期： 2024 年 205 卷

页码：

收录情况： SCI

摘要： This study investigated the effect of hydraulic retention time (HRT) on the denitrification performance and microbial composition of reactors, packed with composite polycaprolactone and corncob carbon sources, during the treatment mariculture wastewater. The optimal HRT was 3 h, and average nitrogen removal efficiency was 99.00 %, 99.07 %, and 98.98 % in the HRT =3, 5, and 7 h groups, respectively. However, the 3 h group (DOC 2.91 mg/L) was the only group with a lower DOC concentration than that of the influent group (3.31 mg/L). Moreover, species richness was lower at HRT =3 h, with a greater proportion of denitrification-dominant phyla, such as Proteobacteria. The abundance of the NarG, NirK, and NirS functional genes suggested that the HRT =3 h group had a significant advantage in the nitrate and nitrite reduction phases. Under a short HRT, the composite carbon source achieved a good denitrification effect.

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