Notice of RetractionInhibitory Effects of Streptomycin and Erythromycin on Methane Production of Anaerobic Granular Sludge

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The inhibitory effects of erythromycin and streptomycin on methane production of anaerobic granular sludge treating avermectin wastewater were investigated. The results indicated that erythromycin and streptomycin showed different effects on methane production of the sludge sample. Obvious lag time, lower production rate and lower final production of methane as well as higher pH values in the presence of streptomycin indicated stronger inhibition of streptomycin on both acetogenesis and methanogenesis, compared to erythromycin. The low half-inhibitory concentration of streptomycin for methane production was obtained as 7.49 mg/L. Erythromycin showed complicated effect on methane production, not only inhibition, especially at low concentration. The maximum methane production rate and final methane production were obtained at erythromycin concentration of 10 mg/L and 120 mg/L, respectively. Different familiarities of antibiotics to microbes in the sludge were considered to be responsible for different effects on methane production.