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Pilot-scale Experience with Biological Nutrient Removal and Biomass Yield Reduction in a Liquid-solid Circulating Fluidized Bed Bioreactor

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Abstract:

A pilot-scale liquid-solid circulating fluidized bed (LSCFB) bioreactor was developed at the Adelaide Pollution Control Plant, London, Ontario, Canada, to study its commercial viability for biological nutrient removal. Lava rock particles of 600 µm were used as a biomass carrier media. The LSCFB removed approximately 90% organic, 80% nitrogen, and 70% phosphorus at loading rates of 4.12 kg COD/m3·d, 0.26 kg N/m3·d, and 0.052 kg P/m3·d, and an empty bed contact time of 1.5 hours. Effluent characterized by <1.0 mg NH4-N/L, <5.0 mg NO3-N/L, <1.0 mg PO4-P/L, <10 mg TN/L, <10 mg SBOD/L, and 10 to 15 mg volatile suspended solids (VSS)/L can easily meet the criteria for nonpotable reuse of treated wastewater. The system removed nutrients without using any chemicals, and the secondary clarifier removed suspended solids removal without chemicals. A significant reduction (approximately 75%) in biomass yield to 0.12 to 0.16 g VSS/g chemical oxygen demand (COD) was observed, primarily because of long biological solids retention time (SRT) of 20 to 39 days and a combination of anoxic and aerobic COD consumption.

Keywords: biofilm; biological phosphorus removal; biomass yield; liquid-solid circulating fluidized bed; nitrification-denitrification

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143010X12609736967080

Publication date: September 1, 2010

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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