Biodegradability and toxicity of styrene in the anaerobic digestion process |
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Authors: | Pablo Araya Rolando Chamy Manuel Mota Madalena Alves |
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Institution: | (1) Escuela de Ingeniería Bioquímica, Universidad Católica de Valparaíso, Valparaíso, Chile;(2) Centro de Engenharia Biológica-IBQF, Universidade do Minho, 4710-057 Braga, Portugal |
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Abstract: | Start-up and operation of an Upflow Anaerobic Sludge Blanket (UASB) reactor fed with an industrial effluent from a polymer synthesis plant containing 6 mg styrene l–1 was unstable. In batch assays with 200 mg styrene l–1, 74% of styrene was degraded at a rate of 7 ml methane g–1 volatile suspended solids.day, without a lag phase. The toxicity limit (IC50) of styrene was 1.4 mM for the acetoclastic activity, 0.45 and 1.6 mM for the methanogenic activity in the presence of 30 mM of propionate and ethanol respectively. Instability of UASB operation was attributed to other compounds such as acrylates or detergents present in the industrial effluent. |
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Keywords: | biodegradability granular sludge styrene toxicity |
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