Abstract
A semi-synthetic designed medium (SDM), containing azo dyes, salts and other additives, was treated in a laboratory-scale upflow microaerophilic fixed-film bioreactor (UMFB) at various hydraulic retention times (HRT) in order to obtain efficient COD removal and decolorization using consortium VIE6. Grau’s second order and modified Stover-Kincannon substrate removal kinetic models were the best fitting models for the steady-state experimental data of UMFB. The efficacy of microaerophilic process to treat SDM at varying shock-loads (high dye and salt concentrations) was assessed simultaneously. The best organic matter removal efficiency, measured as Chemical Oxygen Demand (COD), was 98 % and decolorization was 99 % at 2 d HRT. UMFB endured shock-loads of dye and salts up to 500 mg L−1 and 80 g L−1, respectively, at 2 d HRT. Bio-film configured system operating in UMFB, having charcoal as supporting material, showed overall better efficiency in treating SDM, and even after reactor completion, the bio-film remained in immobilized form showed its stability to withstand the toxic shock loads. In addition, metabolites produced during microaerophilic processes were determined along with community dynamics of consortium VIE6. The role of each organism in a community was elucidated based on their dominance in the effluent at 2 d HRT. Moreover, phytotoxicity analysis of SDM and its bio-degraded products after treatment showed acute decline in the toxicity of metabolites as compared to SDM.
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Authors are grateful to the Department of Biotechnology (DBT), Ministry of Science and Technology, New Delhi, India. We gratefully acknowledge the Sophisticated Instrumentation Centre for Applied Research and Training (SICART), Vallabh Vidyanagar, Gujarat, India for providing FTIR and GC-MS facility.
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Shah, B., Patel, A. & Madamwar, D. Kinetic Modeling and Community Dynamics of Microaerophilic Treatment of Textile Dyes Containing Effluent by Consortium VIE6. Environ. Process. 3, 397–411 (2016). https://doi.org/10.1007/s40710-016-0156-0
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DOI: https://doi.org/10.1007/s40710-016-0156-0