Elemental sulfur-driven autotrophic denitrification for advanced nitrogen removal from mature landfill leachate after PN/A pretreatment

Chujun Zeng, Qingxian Su, Liyu Peng, Lianpeng Sun, Qing Zhao*, Xingxing Diao, Hui Lu

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Elemental sulfur-driven autotrophic denitrification (S0dAD) was applied in a packed-bed reactor to remove residual nitrogen from raw mature landfill leachate after partial nitritation and anaerobic ammonium oxidation (anammox) (PN/A) pretreatment. The performance and stability of S0dAD were evaluated with different NOx (nitrate and nitrite) loadings and hydraulic retention time (HRT) at 15–28 °C over an operational period of 240 days. Stable and high NOx removal efficiency (NRE) of 96.6 ± 1.9% was determined under a stepwise decrease in HRT (from 9 h to 2 h), resulting in low total nitrogen concentrations of 24.0 ± 3.9 mg-N/L in the effluent. The circumneutral pH, associated with efficient elemental sulfur supply, facilitated to maintain the high NRE of S0dAD, which contributed to over 86.3% of the total NOx removal in packed-bed reactor. Biomass in S0dAD packed-bed reactor was highly enriched with sulfur-oxidizing bacteria (SOB) (58.4%), including a predominant genus of Thiobacillus (47.7%) and two less-abundant genera of Sulfurimonas (4.5%) and Sulfurovum (5.5%). This study highlights the potential implementation of S0dAD coupled with PN/A process for advanced nitrogen removal from carbon-deficient ammonium-laden wastewater, particularly mature landfill leachate.

Original languageEnglish
Article number128256
JournalChemical Engineering Journal
Volume410
Number of pages10
ISSN1385-8947
DOIs
Publication statusPublished - 2021

Keywords

  • Decentralized system
  • Elemental sulfur
  • Mature landfill leachate
  • Sulfur-oxidizing bacteria
  • Wastewater treatment

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