Effect of process variables on the sulfate reduction process in bioreactors treating metal-containing wastewaters: factorial design and response surface analyses

Villa-Gomez, D. K., Pakshirajan, K., Maestro, R., Mushi, S. and Lens, P. N. L. (2015) Effect of process variables on the sulfate reduction process in bioreactors treating metal-containing wastewaters: factorial design and response surface analyses. Biodegradation, 26 4: 299-311. doi:10.1007/s10532-015-9735-4


Author Villa-Gomez, D. K.
Pakshirajan, K.
Maestro, R.
Mushi, S.
Lens, P. N. L.
Title Effect of process variables on the sulfate reduction process in bioreactors treating metal-containing wastewaters: factorial design and response surface analyses
Journal name Biodegradation   Check publisher's open access policy
ISSN 0923-9820
1572-9729
Publication date 2015-07-01
Year available 2015
Sub-type Article (original research)
DOI 10.1007/s10532-015-9735-4
Open Access Status Not Open Access
Volume 26
Issue 4
Start page 299
End page 311
Total pages 16
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Language eng
Formatted abstract
The individual and combined effect of the pH, chemical oxygen demand (COD) and SO4 2− concentration, metal to sulfide (M/S2−) ratio and hydraulic retention time (HRT) on the biological sulfate reduction (SR) process was evaluated in an inverse fluidized bed reactor by factorial design analysis (FDA) and response surface analysis (RSA). The regression-based model of the FDA described the experimental results well and revealed that the most significant variable affecting the process was the pH. The combined effect of the pH and HRT was barely observable, while the pH and COD concentration positive effect (up to 7 and 3 gCOD/L, respectively) enhanced the SR process. Contrary, the individual COD concentration effect only enhanced the COD removal efficiency, suggesting changes in the microbial pathway. The RSA showed that the M/S2− ratio determined whether the inhibition mechanism to the SR process was due to the presence of free metals or precipitated metal sulfides.
Keyword Sulfate reducing bacteria
pH
Metals
Inverse fluidized bed bioreactor
Sulfate reduction process
Statistical analysis
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID CONACYT-192635/303731
SR/BY/L-19/10
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Non HERDC
 
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Created: Fri, 05 Feb 2016, 20:39:34 EST by Jeannette Watson on behalf of School of Civil Engineering