Impact of worm predation on pseudo-steady-state of the circulating fluidized bed biofilm reactor

Ming Li, George Nakhla, Jesse Zhu

Research output: Journal PublicationArticlepeer-review

15 Citations (Scopus)


This paper studies integrated simultaneous carbon and nitrogen removal as well as worm predation, in a circulating fluidized bed biofilm reactor (CFBBR) operated with an anoxic-aerobic bioparticle recirculation. A lab-scale CFBBR with a 8.5-liter reaction zone comprising 2L anoxic and 6.5L aerobic compartments was designed to evaluate the aquatic Oligochaete worm effect. Long-term (200days) performance showed that stable and high-rate chemical oxygen demand (COD) with sodium acetate as the carbon source and total nitrogen (NH4Cl as nitrogen source) conversions were achieved simultaneously, with low sludge production of 0.082g VSS (volatile suspended solids) g COD-1 at pseudo-steady-state. Worm predation, which causes considerable sludge reduction of the bioparticle process, was studied. The results proved that the worm predation has a significant impact on the pseudo-steady-state performance of the CFBBR, decreasing biomass yield, decreasing oxygen concentration and increasing expanded bed height.

Original languageEnglish
Pages (from-to)281-289
Number of pages9
JournalBioresource Technology
Publication statusPublished - Jan 2013
Externally publishedYes


  • Bioparticle circulation
  • Circulating fluidized bed biofilm reactor (CFBBR)
  • Self-balancing micro-community
  • Worm predation

ASJC Scopus subject areas

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


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