Biotreatment of As-containing simulated acid mine drainage using laboratory scale sulfate reducing upflow anaerobic sludge blanket reactor |
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| Affiliation: | 1. Istanbul Medeniyet University, Bioengineering Department, Goztepe, Istanbul, Turkey;2. Department of Environmental Engineering, Yildiz Technical University, Istanbul, Turkey;3. CSIRO Land and Water, Minerals Down Under Flagship, 147 Underwood Avenue, Floreat, WA 6014, Australia;1. Centro de Ciências do Mar, CCMAR, Portugal;2. Centro de Investigação Marinha e Ambiental, CIMA, Portugal;3. Centro de Investigação em Química do Algarve, CIQA, Portugal;4. Faculdade de Ciências e Tecnologia, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal;1. Graduate School of Environmental Studies, Tohoku University, Sendai 9808579, Japan;2. College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China;3. Graduate School of Engineering, Tohoku University, Sendai 9808579, Japan;1. Department of Bioengineering, Istanbul Medeniyet University, 34700 Istanbul, Turkey;2. Environmental and Energy Systems Engineering Program, Istanbul Medeniyet University, 34700 Istanbul, Turkey;3. Department of Civil Engineering, Hasan Kalyoncu University, 27410 Gaziantep, Turkey;4. Environmental Sciences and Energy Management Program, Hasan Kalyoncu University, 27410 Gaziantep, Turkey;1. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan;2. National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-0053, Japan;3. Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8579, Japan |
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| Abstract: | Heavy metal contamination of water sources can occur from the discharge of acid mine drainage (AMD). This study assessed sulfidogenic treatment of As-, Fe-, Zn-, Ni- and Cu-containing AMD in an upflow anaerobic sludge blanket (UASB) reactor, operated for approximately 500 days. Sulfate reducing granules were successfully enriched with synthetic wastewater and sulfate concentration decreased from 2000 mg/L in the influent to 100–200 mg/L in the effluent. The pH increased from 3–4 to 6–8 as a result of biogenic alkalinity production. Arsenic removal was not detected in the absence of heavy metals, possibly due to the high dissolved sulfide concentration. In the presence of heavy metals, and at low dissolved sulfide concentrations, As removal efficiency increased to 98–100% likely due to the formation of arsenopyrite (FeAsS) or the adsorption of As on metal sulfide precipitates. Fe, Cu, Ni and Zn removal efficiencies approached 99% in the presence of dissolved sulfide. When hydrogen sulfide generation was insufficient to precipitate all of the metals, Fe was detected in the UASB effluent. The results showed that As-, Fe-, Zn-, Ni- and Cu-containing AMD can be effectively treated by sulfate reducing granules in UASB reactors. |
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| Keywords: | Arsenic Sulfate reducing bacteria Heavy metal removal Sulfide |
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