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Influence of high doses of antibiotics on anoxic-aerobic membrane bioreactor in treating solid waste leachate

Kaewmanee, Anekpracha, Chiemchaisri, Wilai, Chiemchaisri, Chart
International biodeterioration & biodegradation 2019 v.138 pp. 15-22
adverse effects, antibiotics, biodegradation, leachates, membrane bioreactors, nitrites, norfloxacin, organic matter, sludge, solid wastes, sulfamethoxazole, trimethoprim
This study aims to investigate the influence of high antibiotics doses on the efficiency of an anoxic-aerobic membrane bioreactor (ANX-AMBR) in treating solid waste leachate for one-year operation without sludge withdrawal. Two doses of a mixture of norfloxacin (NOR), trimethoprim (TRM), sulfamethoxazole (SMX) and tetracycline (TC), a total of 4 mg L−1 (1 mg L−1 each) and a total of 20 mg L−1 (5 mg L−1 each), had been fed into the ANX-AMBR operated at HRTs of 12 h and 24 h. A high efficiency of organic matter removal could be achieved >90% in all conditions. The highest elimination of NOR, 77%; TRM/SMX/TC, 50–57%, was found under a 12 h-HRT with the antibiotic dose of 4 mg L−1. However, high antibiotic doses gave adverse effects on nitrite reduction-oxidation including antibiotic removal efficiency in the ANX-AMBR. Additionally, the extracellular polymeric substances were produced remarkably in the system after the antibiotic dose of 20 mg L−1. Mass balance analysis suggests that biodegradation was a major role in antibiotics removal in this system. Batch studies showed that the first order kinetics rate constants (k) of antibiotics biodegradation were 0.509–1.573 d−1 of ANX and 0.128–0.516 d−1 of AMBR.