The long-term impact of cefalexin on organic substrate degradation and microbial community structure in EGSB system. (October 2017)

• Record Type: Journal Article
• Authors: Meng, Ling-Wei; Li, Xiang-Kun; Wang, Shu-Tao; Liu, Li-Li; Ma, Kai-Li; Zhang, Jie
• Is Part Of: Chemosphere. Volume 184(2017)
• Page Start: 215
• Page End: 223
• Publication Date: 2017-10
• Subjects: Antibiotic manufactured wastewater -- Cefalexin -- EGSB -- High-through sequencing -- By-products; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2017.05.171
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In order to investigate long-term effect of cefalexin (CFX) on the performance of expanded granular sludge bed (EGSB) system and microbial community structure, two 1.47 L EGSB reactors E1 and E2 were designed and run for 224 days treating with synthetic antibiotic wastewater. For the purpose of comparison, E1 was fed with synthetic antibiotic industry wastewater with CFX added as the test reactor, while, E2 was fed without any CFX added as the control reactor (E2). The addition of CFX resulted in the continual increasing of soluble COD (sCOD) and accumulation of VFAs in the effluent of E1 system. Besides, it was found that the accumulation of CFX by-products D-1, D-2 and D-3 was negative correlation with sCOD removal efficiency. Furthermore, the microbial community structures were also investigated. For the bacterial community, Gelria and Syntrophorhabdus which can ferment propionate and other organic pollutants as their substrate were obviously enriched in E1 system. For the archaea, there was more functional diversity in E1 system than in E2 system. Furthermore, fungi also played an important role on the removal of complex organics in E1 system. Graphical abstract: Highlights: The effect of antibiotic cefalexin on performance of the EGSB system is recoverable. The accumulation of cefalexin by-products affects the reactor running. The bacterial genera Gelria and Syntrophorhabdus played a key role on the degradation of organic pollutants. Hydrogenotrophic methanogens had higher competitive advantages than others methanogens. Fungi played an important role on the complex organics removal.