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Effects of sulfide on the integration of denitrification with anaerobic digestion

Paper ID Volume ID Publish Year Pages File Format Full-Text
20154 43160 2015 6 PDF Available
Title
Effects of sulfide on the integration of denitrification with anaerobic digestion
Abstract

•Anaerobic acidogenesis was accelerated with low S/NO3−–N ratios (0.27–1.08).•Increases in S/NO3−–N caused a shift from denitrification to DNRA.•Heterotrophic denitrification and acidogenesis were suppressed with the S/NO3−–N ratios of 1.60.

The effects of sulfide on the integration of denitrification with anaerobic digestion using anaerobic effluents of cassava stillage as carbon source were investigated. Batch tests indicated that nitrate reduction efficiencies decreased from 96.5% to 15.8% as sulfide/nitrate (S/NO3−–N) ratios increased from 0.27 to 1.60. At low S/NO3−–N ratios (0.27–1.08) anaerobic acidogenesis was accelerated. Nitrate was reduced to nitrite via sulfur-based autotrophic denitrification, after which the formed nitrite and residual nitrate were converted to N2 via heterotrophic denitrification. Increases in the S/NO3−–N ratio (1.60) caused a shift (76.3%) in the nitrate reduction pathway from denitrification to dissimilatory nitrate reduction to ammonia (DNRA). Sulfide concentrations (S/NO3−–N ratio of 1.60) suppressed not only heterotrophic denitrification but also acidogenesis. The potentially toxic effect of sulfide on acid production was mitigated by its rapid oxidation to sulfur, allowing the recovery of acidogenesis.

Keywords
Anaerobic acidogenesis; S/NO3−–N ratio; Denitrification; Dissimilatory nitrate reduction to ammonia; Electron-flow
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 120, Issue 4, October 2015, Pages 426–431
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us