Effect of sludge recirculation on removal of antibiotics in two-stage membrane bioreactor (MBR) treating livestock wastewater
| Autor: | Chart Chiemchaisri, Wilai Chiemchaisri, Rathborey Chan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Hydraulic retention time Health Toxicology and Mutagenesis Biomass 02 engineering and technology 010501 environmental sciences Membrane bioreactor 01 natural sciences Applied Microbiology and Biotechnology complex mixtures law.invention 020401 chemical engineering law 0204 chemical engineering Waste Management and Disposal Filtration 0105 earth and related environmental sciences Water Science and Technology Pollutant Chemistry Public Health Environmental and Occupational Health Biodegradation Pulp and paper industry Pollution Wastewater Anaerobic exercise Research Article |
| Zdroj: | J Environ Health Sci Eng |
| ISSN: | 2052-336X |
| Popis: | Two-stage MBR consisting of anaerobic and aerobic reactors was operated at total hydraulic retention time (HRT) of 48 h for the treatment of livestock wastewater containing antibiotics, i.e. amoxicillin (AMX), tiamulin (TIA), and chlortetracycline (CTC), under the (1st) absence and (2nd) presence of sludge recirculation between the reactors. During the operation with sludge recirculation, the removals of organic and nitrogen were enhanced. Meanwhile, the removals of TIA and CTC were found to decrease by 9% and 20% in the aerobic reactor but increased by 5% to 7% in the anaerobic reactor due to the relocation of biomass from the aerobic to the anaerobic reactor. A high degree of AMX biodegradation under both anaerobic and aerobic conditions and partial biodegradation of TIA and CTC under aerobic conditions were confirmed in batch experiments. Moreover, the effect of sludge recirculation on biomass and pollutant removal efficiencies in the 2-stage MBR was revealed using microbial community analyses. Membrane filtration also helped to retain the adsorbed antibiotics associated with small colloidal particles in the system. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s40201-020-00571-z) contains supplementary material, which is available to authorized users. |
| Databáze: | OpenAIRE |
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