Performance of sulfur-based autotrophic denitrification and denitrifiers for wastewater treatment under acidic conditions

Shan Huang, Zhaoming Zheng, Qingqing Wei, Il Han, Peter R. Jaffé

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Autotrophic denitrification under acidic conditions using sulfide (S2−), elemental sulfur (S0), and thiosulfate (S2O32−) as electron donors are evaluated. Results from batch and column experiments show that when different S species were supplied, different pH conditions and denitrifier communities were required for denitrification to occur. Nitrate and nitrite were removed via autotrophic denitrification at pH ranging from 4 to 8, when S2− or S2O32− was the electron donor, while with S0 denitrification was only observed at pH > 6. When S2− was used as electron donor, it was converted to S0, and S0 was not used while S2− was available. When addition of S2− was discontinued, or S2− depleted, S0 that had accumulated was used as electron donor for denitrification. These findings demonstrate that sulfur-based autotrophic denitrification can proceed under acidic conditions, but that the addition of appropriate S species and the presence of an effective denitrifier community are required.

Original languageEnglish (US)
Article number122176
JournalBioresource Technology
Volume294
DOIs
StatePublished - Dec 2019

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

Keywords

  • Acidic
  • Autotrophic denitrification
  • Denitrifying genes
  • Elemental sulfur
  • Microbial community
  • Sulfide
  • Thiosulfate

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