Impact of carbon to nitrogen ratio on nutrient removal in a liquid-solid circulating fluidized bed bioreactor (LSCFB)

Mohammad Islam, Nakhla George, Jesse Zhu, Nabin Chowdhury

Research output: Journal PublicationArticlepeer-review

24 Citations (Scopus)

Abstract

The performance of a liquid-solid circulating fluidized bed bioreactor (LSCFB) with anoxic and aerobic beds and lava rock as a biofilm carrier media was used to investigate the impact of the COD/N ratio on the process performance, with particular focus on total nitrogen removal. Three different COD/N ratios of 10:1, 6:1 and 4:1 were tested at an empty bed contact time of 0.82 h. More than 90% of the influent organic matter was removed throughout the study with 58% removal in the anoxic column in Phase III. Total nitrogen removal efficiencies in Phases I-III were 91%, 82% and 71% and simultaneous nitrification-denitrification (SND) occurred in the aerobic downer. The LSCFB demonstrated tertiary effluent quality at COD/N ratio of 10:1 and 6:1 with soluble biochemical oxygen demand (SBOD) <10 mg l-1 and total nitrogen (TN) <10 mg l-1.

Original languageEnglish
Pages (from-to)578-583
Number of pages6
JournalProcess Biochemistry
Volume44
Issue number5
DOIs
Publication statusPublished - May 2009
Externally publishedYes

Keywords

  • Simultaneous nitrification-denitrification
  • Total nitrogen

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Applied Microbiology and Biotechnology

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