Heavy metal removal from synthetic wastewaters in an anaerobic bioreactor using stillage from ethanol distilleries as a carbon source |
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| Institution: | 1. COPPE – Programa de Engenharia Química/Universidade Federal do Rio de Janeiro, Centro de Tecnologia – bloco G, Ilha do Fundão, 21941-972 Rio de Janeiro, Brazil;2. Departamento de Tecnologia de Processos Bioquímicos, Instituto de Química, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier 524, Maracanã, 20550-900 Rio de Janeiro, Brazil;3. Escola de Química/Universidade Federal do Rio de Janeiro, Centro de Tecnologia – bloco E, Ilha do Fundão, 21941-972 Rio de Janeiro, Brazil;1. International Science and Technology Cooperation Center for Urban Alternative Water Resources Development, Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi, Key Laboratory of Environmental Engineering, Shaanxi, Xi''an University of Architecture and Technology, No. 13 Yanta Road, Xi''an, 710055, China;2. College of Engineering, China Agriculture University, Beijing, 10081, China;3. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, 980-8579, Japan;4. Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan;1. Master''s Program of Management of Technology, Feng Chia University, Taiwan;2. Department of International Business, Feng Chia University, Taiwan;3. Green Energy Development Center, Feng Chia University, Taiwan;1. Division of Resource Circulation, Korea Environment Institute, 370 Sicheong-daero, Sejong 30147, Republic of Korea;2. Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea;1. School of Biotechnology, Faculty of Science, Banaras Hindu University, Varanasi 221 005, India;2. Division of Crop Improvement, Indian Institute of Sugarcane Research, Rae Bareli Road, PO Dilkusha, Lucknow 226 002, India |
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| Abstract: | This work was conducted to investigate the possibility of using stillage from ethanol distilleries as substrate for sulfate reducing bacteria (SRB) growth and to evaluate the removal efficiency of heavy metals present in wastewaters containing sulfates. The experiments were carried out in a continuous bench-scale Upflow Anaerobic Sludge Blanket reactor (13 l) operated with a hydraulic retention time of 18 h. The bioreactor was inoculated with 7 l of anaerobic sludge. Afterwards, an enrichment procedure to increase SRB numbers was started. After this, cadmium and zinc were added to the synthetic wastewater, and their removal as metal sulfide was evaluated. The synthetic wastewater used represented the drainage from a dam of a metallurgical industry to which a carbon source (stillage) was added. The results showed that high percentages of removal (>99%) of Cd and Zn were attained in the bioreactor, and that the removal as sulfide precipitates was not the only form of metal removal occurring in the bioreactor environment. |
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