Influence of Florfenicol on the Treatment Effect of Intermittent Aeration Dynamic Membrane Bioreactors, and its Enhanced Removal Process Investigation
2016
Wu, Xiang | Wu, Hao | Mao, Lin | Yu, Lan | Zhang, Rongfei | Ye, Jinyun
This paper investigated the influence of various florfenicol concentrations on the treatment effect of greenhouse turtle breeding wastewater by intermittent aeration dynamic membrane bioreactor (IADMBR). The results showed that when the florfenicol concentration reached 80 and 120 ng L⁻¹, the average removal efficiencies of ammonia nitrogen and chemical oxygen demand (COD) decreased by 32 and 48 %, respectively. Thus, the enhanced removal of florfenicol and its maintenance at a low concentration are prerequisites to ensure excellent effluent quality. Orthogonal experiments showed that the optimized IADMBR process parameters were hydraulic retention time (HRT) = 5 h, sludge retention time (SRT) = 30 days, and C/N = 2.5; using this combination, the florfenicol concentration was reduced to 25.8 ng L⁻¹, and the average removal efficiency was as high as 78.5 %. The large-scale field pilot test showed that the optimized IADMBR process not only ensured standardized discharge of greenhouse turtle breeding wastewater but also effectively reduced antibiotic pollution and was thus worthy of use in practical applications.
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