Response Surface Analysis and Statistical Modeling of Sulfide Generation from Municipal Wastewater |
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| Authors: | Ali Akbar Zinatizadeh H Bonakdari M Pirsaheb E Gharacheh |
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| Institution: | 1. Faculty of Chemistry, Department of Applied Chemistry, Razi University, Kermanshah, Iran;2. Water and Wastewater Research Center (WWRC), Razi University, Kermanshah, Iran;3. Faculty of Engineering, Department of Civil Engineering, Razi University, Kermanshah, Iran;4. Department of Environmental Health Engineering, Kermanshah Health Research Center (KHRC), Kermanshah University of Medical Sciences, Iran;5. Water and Environment Division, Water and Power Industry Institute for Applied and Scientific Higher Education, Kermanshah, Iran |
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| Abstract: | In this study, the interactive effects of four independent variables (initial chemical oxygen demand (COD) concentration, rotational velocity, temperature, and retention time) on the sulfide generation process in municipal wastewater were investigated. The process was modeled and analyzed with the variables in a series batch experiments. Experiments were conducted based on a central composite face‐centered design and analyzed using response surface methodology. The region of exploration for the process was taken as the area enclosed by COD (250 and 650 mg/L), rotational velocity (40 and 200 rpm), temperature (16 and 28°C), and retention time (2 and 40 h) boundaries. Eleven dependent parameters were either directly measured or calculated as response. The most influential variable on H2S (g) production was found to be retention time. The results showed that simultaneous increase in temperature and rotational velocity caused an increasing trend in the amount of H2S (g) emitted. Total sulfide was decreased by increasing rotational velocity due to more H2S (g) secretion resulting from increased mixing rate. The present study provides valuable information about interrelations of quality and process parameters at different values of the studied variables. |
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| Keywords: | Municipal wastewater Response surface methodology Sulfide Temperature Velocity |
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