TY - JOUR
T1 - Biological conversion of sulfisoxazole in an autotrophic hydrogen-based membrane biofilm reactor
AU - Yang, Lin
AU - Pang, Si
AU - Zhou, Jingzhou
AU - Wu, Chengyang
AU - Li, Xiaodi
AU - Yao, Mengying
AU - Xia, Siqing
AU - Rittmann, Bruce E.
N1 - Funding Information:
This work is supported by National Key Project of Research and Development Plan of China (Grant No. 2021YFC3201300 ) and National Natural Science Foundation of China (Grant No. NSFC 51678422 ).
Publisher Copyright:
© 2022
PY - 2023/2
Y1 - 2023/2
N2 - Sulfisoxazole (SIZ), a common antimicrobial prescribed for treating infections in livestock, is frequently detected in surface water and groundwater along with nitrate. The interactions of SIZ biotransformation and nitrate removal were investigated in a H2-based membrane biofilm reactor (H2-MBfR) through long-term reactor operation augmented by short-term batch experiments in serum bottles. Denitrification in the H2-MBfR was not influenced by SIZ when its input concentration was ≤5 mg L−1, although SIZ removal was inhibited by nitrate. Transformation products identified by mass spectrometry were formed via hydrogenation (reduction) reactions. The addition of SIZ shaped the microbial community structure, leading to the relative abundance of denitrifiers decreasing with the highest SIZ loading. Sulfate-reducing bacteria (SRB) were present in all stages, as the biofilms had relatively high abundances of the dsrA gene and its transcription products, while sulfide was generated in the final stage. SRB also appeared to be important in SIZ biotransformation, perhaps using SIZ as an electron donor, electron acceptor, or both. Concurrent SIZ removal and stable denitrification make the H2-MBfR a prospective technology for the treatment of wastewaters polluted with nitrate and SIZ.
AB - Sulfisoxazole (SIZ), a common antimicrobial prescribed for treating infections in livestock, is frequently detected in surface water and groundwater along with nitrate. The interactions of SIZ biotransformation and nitrate removal were investigated in a H2-based membrane biofilm reactor (H2-MBfR) through long-term reactor operation augmented by short-term batch experiments in serum bottles. Denitrification in the H2-MBfR was not influenced by SIZ when its input concentration was ≤5 mg L−1, although SIZ removal was inhibited by nitrate. Transformation products identified by mass spectrometry were formed via hydrogenation (reduction) reactions. The addition of SIZ shaped the microbial community structure, leading to the relative abundance of denitrifiers decreasing with the highest SIZ loading. Sulfate-reducing bacteria (SRB) were present in all stages, as the biofilms had relatively high abundances of the dsrA gene and its transcription products, while sulfide was generated in the final stage. SRB also appeared to be important in SIZ biotransformation, perhaps using SIZ as an electron donor, electron acceptor, or both. Concurrent SIZ removal and stable denitrification make the H2-MBfR a prospective technology for the treatment of wastewaters polluted with nitrate and SIZ.
KW - Biodegradation
KW - Denitrification
KW - H-based membrane biofilm reactor
KW - Sulfate-reducing bacteria
KW - Sulfisoxazole removal
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U2 - 10.1016/j.jwpe.2022.103396
DO - 10.1016/j.jwpe.2022.103396
M3 - Article
AN - SCOPUS:85145569708
SN - 2214-7144
VL - 51
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
M1 - 103396
ER -