Simultaneous carbon, nitrogen and phosphorous removal from municipal wastewater in a circulating fluidized bed bioreactor

Ajay Patel, Jesse Zhu, George Nakhla

Research output: Journal PublicationArticlepeer-review

94 Citations (Scopus)

Abstract

In this study, the performance of the circulating fluidized bed bioreactor (CFBB) with anoxic and aerobic beds and employing lava rock as a carrier media for the simultaneous removal of carbon, nitrogen and phosphorus from municipal wastewater at an empty bed contact time (EBCT) of 0.82 h was discussed. The CFBB was operated without and with bioparticles' recirculation between the anoxic and aerobic bed for 260 and 110 d respectively. Without particles' recirculation, the CFBB was able to achieve carbon (C), total nitrogen (N) and phosphorous (P) removal efficiencies of 94%, 80% and 65% respectively, whereas with bioparticles' recirculation, 91%, 78% and 85% removals of C, N and P were achieved. The CFBB was operated at long sludge retention time (SRT) of 45-50 d, and achieved a sludge yield of 0.12-0.135 g VSS g COD-1. A dynamic stress study of the CFBB was carried out at varying feed flow rates and influent ammonia concentrations to determine response to shock loadings. The CFBB responded favourably in terms of TSS and COD removal to quadrupling of the feed flow rate. However, nitrification was more sensitive to hydraulic shock loadings than to doubling of influent nitrogen loading.

Original languageEnglish
Pages (from-to)1103-1112
Number of pages10
JournalChemosphere
Volume65
Issue number7
DOIs
Publication statusPublished - Nov 2006
Externally publishedYes

Keywords

  • Biological nutrient removal (BNR)
  • Circulating fluidized bed bioreactor (CFBB)
  • Empty bed contact time (EBCT)
  • Sludge retention time (SRT)

ASJC Scopus subject areas

  • Environmental Engineering
  • Chemistry (all)
  • Environmental Chemistry
  • Pollution
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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