en Evaluation of Baffle Fixes Film up Flow Sludge Blanket Filtration (BFUSBF) System in Treatment of Wastewaters from Phenol and 2,4-Dinitrophenol Using Daphnia Magna Bioassay عمومى General پژوهشي Research <p style="text-align: left;"><strong>Background:</strong> Phenol and nitrophenol are common compounds found in different types of industrial wastewater known as serious threats to human health and natural environment. In this study, <em>Daphnia magna</em> was used to evaluate the effectiveness of &quot;baffle fixes film up flow sludge blanket filtration&quot; (BFUSBF) system in elimination of phenolic compounds from water.</p> <p style="text-align: left;"><strong>Methods:</strong> <em>D. magna</em> cultures were used as toxicity index of phenol and&nbsp;2,4-DNP mixtures after treatment by a pilot BFUSBF system which consisted of baffle in anoxic section and biofilm in aerobic sections. Initial concentrations were 312 mg/L phenol and 288 mg/L 2,4-dinitrophenol (2,4-DNP).</p> <p style="text-align: left;"><strong>Results:</strong> Bioassay tests showed that <em>D. magna</em> was influenced by the toxicity of phenol and&nbsp;2,4 DNP mixtures. The comparison between the toxicity of initial phenol and 2,4-DNP mixtures and the output toxic unit (TU) derived from BFUSBF treatment system showed that the TU of the effluent from BFUSBF reactor was much lower than that of the solution that entered the reactor.</p> <p style="text-align: left;"><strong>Conclusion:</strong> Based on the acute toxicity test, BFUSBF process could reduce phenol and 2,4-DNP in aqueous solutions. Therefore, it is possible to use BFUSBF process as an appropriate treatment option for wastewaters containing phenolic compounds.</p> 2,4-Dinitrophenol, Chemical Water Pollution, Phenol, Water Purification, Daphnia 7 11 http://ijt.arakmu.ac.ir/browse.php?a_code=A-10-286-1&slc_lang=en&sid=1 Mohammad Javad Ghannadzadeh محمدجواد قنادزاده 100319475328460011149 100319475328460011149 No Department of Environmental Health Engineering, Tarbiat Modares University, Tehran, Iran. Department of Environmental Health Engineering, Tarbiat Modares University, Tehran, Iran. Ahmad Jonidi Jafari احمد جنیدی جعفری jonidi.a@iums.ac.ir 100319475328460011150 100319475328460011150 Yes Department of Environmental Health Engineering, Iran University of Medical Sciences, Tehran, Iran. Department of Environmental Health Engineering, Iran University of Medical Sciences, Tehran, Iran. Abbas Rezaee عباس رضایی 100319475328460011151 100319475328460011151 No Department of Environmental Health Engineering, Tarbiat Modares University, Tehran, Iran. Department of Environmental Health Engineering, Tarbiat Modares University, Tehran, Iran. Fatemeh Eftekharian فاطمه افتخاریان 100319475328460011152 100319475328460011152 No Department of Environmental Health Engineering, Shiraz University of Medical Sciences, Shiraz, Iran. Department of Environmental Health Engineering, Shiraz University of Medical Sciences, Shiraz, Iran. Ali Koolivand علی کولیوند 100319475328460011153 100319475328460011153 No Department of Environmental Health, Arak University of Medical Sciences, Arak, Iran. Department of Environmental Health, Arak University of Medical Sciences, Arak, Iran.