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Effects of hydraulic retention time and influent nitrate concentration on solid-phase denitrification system using wheat husk as carbon source

文献类型： 外文期刊

作者： Niu, Shuhui 1 ; Gao, Shuwei 1 ; Zhang, Kai 1 ; Li, Zhifei 1 ; Wang, Guangjun 1 ; Li, Hongyan 1 ; Xia, Yun 1 ; Tian, Jingjing 1 ; Yu, Ermeng 1 ; Xie, Jun 1 ; Zhang, Minting 3 ; Gong, Wangbao 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Minist Agr, Pearl River Fisheries Res Inst, Key Lab Trop & Subtrop Fishery Resource Applicat &, Guangzhou, Peoples R China

2.Guangdong Ecol Remediat Aquaculture Pollut Res Ctr, Guangzhou, Peoples R China

3.Guangdong Shunde Junjian Modern Agr Technol Co Ltd, Foshan, Peoples R China

关键词： Wheat husk; Solid-phase denitrification; Hydraulic retention time; Influent nitrate concentration; Microbial community

期刊名称：PEERJ （ 影响因子：2.7； 五年影响因子：3.1 ）

ISSN： 2167-8359

年卷期： 2023 年 11 卷

页码：

收录情况： SCI

摘要： Solid-phase denitrification shows promise for removing nitrate (NO-3-N) from water. Biological denitrification uses external carbon sources to remove nitrogen from wastewater, among which agriculture waste is considered the most promising source due to its economic and efficiency advantages. Hydraulic retention time (HRT) and influent nitrate concentration (INC) are the main factors influencing biological denitrification. This study explored the effects of HRT and INC on solid-phase denitrification using wheat husk (WH) as a carbon source. A solid-phase denitrification system with WH carbon source was constructed to explore denitrification performance with differing HRT and INC. The optimal HRT and INC of the wheat husk-denitrification reactor (WH-DR) were 32 h and 50 mg/L, respectively. Under these conditions, NO-3-N and total nitrogen removal rates were 97.37 & PLUSMN; 2.68% and 94.08 & PLUSMN; 4.01%, respectively. High-throughput sequencing revealed that the dominant phyla in the WH-DR operation were Proteobacteria, Bacteroidetes, and Campilobacterota. Among the dominant genera, Diaphorobacter (0.85%), Ideonella (0.38%), Thiobacillus (4.22%), and Sulfurifustis (0.60%) have denitrification functions; Spirochaeta (0.47%) is mainly involved in the degradation of WH; and Acidovorax (0.37%) and Azospira (0.86%) can both denitrify and degrade WH. This study determined the optimal HRT and INC for WH-DR and provides a reference for the development and application of WH as a novel, slow-release carbon source in treating aquaculture wastewater.

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