期刊
BIORESOURCE TECHNOLOGY
卷 320, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124358
关键词
Aerobic granular sludge; Oxytetracycline; Extracellular polymeric substances; Bacterial community; Granulation grade
资金
- Natural Science Foundation of Hunan Province [2020JJ5057]
- Fundamental Research Funds for the Central Universities [531118010401]
- National Natural Science Foundation of China (NSFC, China) [51878517]
- Key Research and Development Program of Hunan Province [2019SK2111]
This study compared the tolerance ability of incomplete and complete granulation sludge to oxytetracycline (OTC), finding that incomplete granulation sludge showed better denitrification performance and resistance, while complete granulation sludge suffered a permanent collapse under high OTC concentrations.
Aerobic granular sludge as a promising technology showed great resistance to adverse conditions. However, the interaction between oxytetracycline (OTC) and granular sludge was not studied sufficiently. This study therefore investigated OTC-tolerance ability of incomplete and complete granulation sludge from aspects of simultaneous nutrients removal, sludge characteristics, microbial activity, community changes, and vice versa OTC removal performance. Incomplete granulation sludge showed better denitrification performance and resistance. Whereas, denitrification and phosphorus removal of complete granulation sludge suffered a permanent collapse under 5 mg/L OTC. OTC could be removed by rapid adsorption and slow biodegradation via granular sludge. The EPS, especially TB-PS, played a significant role during the operational period subjected to OTC. The major genera of Lysobacter and Candidatus_Competibacter laid the biological basis for stability and functionality of granules, which acted as the putative contributors for resisting and removing OTC. This study showed that incomplete-granulated sludge qualified more promising application prospect.
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