Microbial community response to ciprofloxacin toxicity in sponge membrane bioreactor.

Bao-Trong Dang, Xuan-Thanh Bui, Tomoaki Itayama, Huu Hao Ngo, Deokjin Jahng, Chitsan Lin, Shiao-Shing Chen, Kun-Yi Andrew Lin, Thanh-Tin Nguyen, Dinh Duc Nguyen, Todd Saunders

The Science of the total environment 2021 Jun 15

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This study aims to offer insights into how ciprofloxacin (CIP) impact bacterial community structures in the Sponge-MBR process when CIP is spiked into hospital wastewater. We found that the CIP toxicity decreased richness critical phylotypes such as phylum class ẟ-, β-, ɣ-proteobacteria, and Flavobacteria that co-respond to suppress denitrification and cake fouling to 37% and 28% respectively. Cluster analysis shows that the different community structures were formed under the influence of CIP toxicity. CIP decreased attached growth biomass by 2.3 times while increasing the concentration of permeate nitrate by 3.8 times, greatly affecting TN removal by up to 26%. Ammonia removal was kept stable by inflating the ammonia removal rate (p < 0.003), with the wealthy Nitrospira genus guaranteeing the nitrification activity. In addition, we observed an increasing richness of Chloroflexi and Planctomycetes, which may play a role in fouling reduction in the Sponge-MBR. Therefore, if the amount of antibiotics in hospital wastewater continues to increase, it is so important to extend biomass retention for denitrification recovery. Copyright © 2021 Elsevier B.V. All rights reserved.

Citation

Bao-Trong Dang, Xuan-Thanh Bui, Tomoaki Itayama, Huu Hao Ngo, Deokjin Jahng, Chitsan Lin, Shiao-Shing Chen, Kun-Yi Andrew Lin, Thanh-Tin Nguyen, Dinh Duc Nguyen, Todd Saunders. Microbial community response to ciprofloxacin toxicity in sponge membrane bioreactor. The Science of the total environment. 2021 Jun 15;773:145041