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- Title
Using a Statistical Model to Examine the Effect of COD: SO<sub>4</sub><sup>2–</sup> Ratio, HRT and LA Concentration on Sulfate Reduction in an Anaerobic Sequencing Batch Reactor.
- Authors
Singh, Rajesh; Chungman Moon; Veeravalli, Sathyanarayan S.; Shanmugam, Saravanan R.; Chaganti, Subba Rao; Lalman, Jerald A.
- Abstract
Taguchi statistical design, an orthogonal array (OA) method, was used to study the impact of the COD/SO42– ratio, hydraulic retention time (HRT) and linoleic acid (LA) concentration on sulfate (SO42–) reduction in an anaerobic sequencing batch reactor using glucose as the electron donor. Based on the OA, optimum condition for maximum SO42– reduction was evaluated. Increasing the COD/SO42– ratio and HRT caused decreasing SO42– reduction while increased SO42– reduction was observed with increasing LA concentration (1 g L-1). In control (not fed LA) cultures, higher SO42– reduction (87% ± 3%) was observed at a low COD/SO42– ratio of 0.8. This indicates that increasing SO42– reduction was observed at increasing SO42– loading rates. In general, results from this study reveal that limiting the substrate concentration with high SO42– levels (low COD/SO42– ratio) favors high SO42– removal. Surface plots were used to evaluate the significant interactions between the experimental factors. Accuracy of the model was verified using an analysis of residuals. Optimum conditions for maximum SO42– reduction (97.61%) were observed at a COD/SO42– ratio of 0.8 (level 1), 12 h HRT (level 1) together with 1000 mg L-1 LA addition (level 3). In general, the Taguchi OA provided a useful approach for predicting the percent SO42– reduction in inhibited mixed anaerobic cultures within the factor levels investigated.
- Subjects
REDUCTION of sulfates; TAGUCHI methods; ORTHOGONAL arrays; ANAEROBIC reactors; ACID mine drainage; LINOLEIC acid; HYDRAULICS
- Publication
Water (20734441), 2014, Vol 6, Issue 11, p3478
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w6113478