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Response Surface Analysis and Statistical Modeling of Sulfide Generation from Municipal Wastewater
Author(s) -
Zinatizadeh Ali Akbar,
Bonakdari H.,
Pirsaheb M.,
Gharacheh E.
Publication year - 2011
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201000372
Subject(s) - central composite design , wastewater , response surface methodology , sulfide , mixing (physics) , rotational speed , chemical oxygen demand , chemistry , angular velocity , analytical chemistry (journal) , mechanics , environmental science , environmental engineering , chromatography , physics , organic chemistry , quantum mechanics
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 H 2 S (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 H 2 S (g) emitted. Total sulfide was decreased by increasing rotational velocity due to more H 2 S (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.