Biological nitrification in the presence of sulfide and organic matter: effect of zeolite on the process in a batch system

Cesar Huiliñir*, Rodrigo Medina, Silvio Montalvo, Alejandra Castillo, Lorna Guerrero

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

BACKGROUND: Even though the nitrification process is inhibited in the presence of sulfide and organic matter, few efforts have been reported to overcome this weakness. The present work has the goal of determining the effect of zeolite (2.5, 5, 10 and 15 g L-1) as an improver of the nitrification process in the presence of sulfide and organic matter in a batch system. RESULTS: The inhibitory effect of both sulfide and organic matter on the nitrification process was decreased by 53% when using zeolite, with the best results at a zeolite concentration of 15 g L-1. No total ammonia nitrogen (TAN) adsorption on the zeolite was observed under these conditions, with TAN removal taking place mainly by biological oxidation. Specific nitrate production rate increased by 37.73% compared with the control. Sulfide was oxidized chemically in all the assays, with sulfate as the main product, while COD reduction and VSS production were not affected by zeolite. CONCLUSIONS: Zeolite can be used to improve nitrification in batch systems in the presence of sulfur and organic matter, obtaining a faster TAN removal rate and higher specific nitrate production compared with the controls.

Original languageEnglish
Pages (from-to)2390-2398
Number of pages9
JournalJournal of Chemical Technology and Biotechnology
Volume93
Issue number8
DOIs
StatePublished - Aug 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 Society of Chemical Industry

Keywords

  • nitrification
  • toxicity
  • waste-water
  • zeolite

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