Immobilized denitrifying bacteria on modified oyster shell as biofilter carriers enhance nitrogen removal
文献类型： 外文期刊
作者： Yi, Mengmeng 1 ; Wang, Chun 3 ; Wang, Miao 1 ; Ma, Xiaona 4 ; Wang, He 1 ; Liu, Zhigang 1 ; Cao, Jianmeng 1 ; Gao, Fengying 1 ; Ke, Xiaoli 1 ; Lu, Maixin 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Key Lab Trop & Subtrop Fishery Resources Applicat, Minist Agr & Rural Affairs, Guangzhou 510380, Peoples R China
2.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Guangdong Prov Key Lab Aquat Anim Immunol & Sustai, Guangzhou 510380, Peoples R China
3.Beijing Technol & Business Univ, State Environm Protect Key Lab Food Chain Pollut C, Beijing 100048, Peoples R China
4.Jiangsu Ocean Univ, Jiangsu Key Lab Marine Biotechnol, Lianyungang 222005, Peoples R China
5.Guangdong Lab Lingnan Modern Agr, Maoming Branch, Maoming 525000, Peoples R China
关键词： Oyster shell; Immobilized denitrifying bacteria; Biofilter; Nitrogen removal; Microbial community
期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.7； 五年影响因子：7.3 ）
ISSN： 2213-2929
年卷期： 2023 年 11 卷 1 期
页码：
收录情况： SCI
摘要： Biocarriers play a vital role in water treatment in recirculating aquaculture systems. In this study, modified oyster shell (OS)-immobilizing denitrifying bacteria were applied as biocarriers in biofilters. The results revealed that CaCO3 was the main component of the OS calcined at 200 degrees C (OS200), 400 degrees C (OS400), and 600 degrees C (OS600). The surface area and microbe-immobilizing ability of OS200, OS400, and OS600 were enhanced. After immobilizing Pseudomonas putida DS2 and Pseudomonas chengduensis BF6, the average total nitrogen (TN) removal efficiencies of OS400-P (Pseudomonas sp. DS2 and BF6 immobilized onto OS400) and OS600-P (Pseudomonas sp. DS2 and BF6 immobilized onto OS600) reached 50.25% and 61.50%, respectively. The microbial and functional gene richness in the biofilters filled with biocarriers made of OS-immobilizing denitrifying bacteria changed. The genus Pseudomonas became the dominant microbe, which was positively correlated with NO3- -N + NO2- -N (p < 0.001), and TN removal (p < 0.01). Overall, these findings indicate that applying OS immobilizing denitrifying bacteria as biocarriers can be a novel strategy to enhance nitrogen removal in biofilters.
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