Simultaneous sulfide and acetate oxidation under denitrifying conditions using an inverse fluidized bed reactor
BACKGROUND: Simultaneous removal of sulfur, nitrogen and carbon compounds from wastewaters is a commercially important biological process. The objective was to evaluate the influence of the CH₃COO⁻/NO₃⁻ molar ratio on the sulfide oxidation process using an inverse fluidized bed reactor (IFBR).RESULT...
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Published in | Journal of chemical technology and biotechnology (1986) Vol. 83; no. 9; pp. 1197 - 1203 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Chichester, UK
John Wiley & Sons, Ltd
01.09.2008
Wiley |
Subjects | |
Online Access | Get full text |
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Summary: | BACKGROUND: Simultaneous removal of sulfur, nitrogen and carbon compounds from wastewaters is a commercially important biological process. The objective was to evaluate the influence of the CH₃COO⁻/NO₃⁻ molar ratio on the sulfide oxidation process using an inverse fluidized bed reactor (IFBR).RESULTS: Three molar ratios of CH₃COO⁻/NO₃⁻ (0.85, 0.72 and 0.62) with a constant S²⁻/NO₃⁻ molar ratio of 0.13 were evaluated. At a CH₃COO⁻/NO₃⁻ molar ratio of 0.85, the nitrate, acetate and sulfide removal efficiencies were approximately 100%. The N₂ yield (g N₂ g⁻¹ NO₃⁻-N consumed) was 0.81. Acetate was mineralized, resulting in a yield of 0.65 g inorganic-C g⁻¹ CH₃COO⁻-C consumed. Sulfide was partially oxidized to S⁰, and 71% of the S²⁻ consumed was recovered as elemental sulfur by a settler installed in the IFBR. At a CH₃COO⁻/NO₃⁻ molar ratio of 0.72, the efficiencies of nitrate, acetate and sulfide consumption were of 100%, with N₂ and inorganic-C yields of 0.84 and 0.69, respectively. The sulfide was recovered as sulfate instead of S⁰, with a yield of 0.92 g SO₄²⁻-S g⁻¹ S²⁻ consumed.CONCLUSIONS: The CH₃COO⁻/NO₃⁻ molar ratio was shown to be an important parameter that can be used to control the fate of sulfide oxidation to either S⁰ or sulfate. In this study, the potential of denitrification for the simultaneous removal of organic matter, sulfide and nitrate from wastewaters was demonstrated, obtaining CO₂, S⁰ and N₂ as the major end products. Copyright |
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Bibliography: | http://dx.doi.org/10.1002/jctb.1921 NSF-CONACYT - No. 35982-U ark:/67375/WNG-1HPL4127-N ArticleID:JCTB1921 istex:7ECCBFDF077A19BCB234E624E10A7D2C36C1E7D1 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 |
ISSN: | 0268-2575 1097-4660 |
DOI: | 10.1002/jctb.1921 |