Operation Factors of Autotrophic Denitrification with Elemental Sulfur as Terminal Product

Abstract:

An anaerobic membrane bioreactor (UBF) with a total capacity of 3L was employed for treatment of sulfide and nitrate containing wastewater with elemental sulfur as terminal product. The effect of HRT and pH on substrate removal and elemental sulfur accumulation was researched when S/N ratio at 2.5. The influent concentration of S^2-/HS^- and NO₃^--N were 110mg•L^-1 and 20mg•L^-1, respectively, during autotrophic denitrification. When HRT was between 7.41h and 6.83h and pH was between 6 and 7.5, HRT and pH has no effect on NO₃^--N and sulfide removal ratios, and at 97% and 100%, respectively, but elemental sulfur accumulation ratio was increased to 61% with HRT shorten. And low pH (pH at 7) was conducive to elemental sulfur accumulation with the ratio up to 62%. But further to reduce the pH would lead marginal increase in elemental sulfur accumulation ratio at 65%.

• Periodical: Applied Mechanics and Materials (Volumes 295-298)
• Pages: 1110-1114
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.295-298.1110
• Online since: February 2013
• Authors: Yi Yuan, Yong Huang, Xiang Li, Liang Wang
• Keywords: Autotrophic Denitrification, Elemental Sulfur Accumulation, Nitrate Reduction, Sulfide Oxidation

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