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Development of Simulation Model for a Combined Activated-Sludge and Biofilm Process to Remove Nitrogen and Phosphorus

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A simulation model was developed for a combined activated-sludge and biofilm process that was developed in Japan to achieve nitrogen and phosphorus removal without extending existing treatment facilities. The process consists of an activated-sludge process of three zones (anaerobic, anoxic, and aerobic) and a biofilm process in the form of fluidized media in the aerobic zone. In this process, nitrification is carried out by nitrifiers on the fluidized media and denitrification and phosphorus removal are performed by activated sludge.

First, a biofilm model was developed by modifying components, biological processes, and detachment mechanism of an existing model using experimental results from the fluidized-bed process. Second, the biofilm model was incorporated in the International Association on Water Quality Activated Sludge Model No. 2 with the addition of a mechanism of transferring detached biofilm to activated sludge. Parameter values of this model were fitted using data from a pilot plant during a period of no rainfall. The model was then evaluated with pilot-plant data for a period of rainfall. The model developed for the combined activated-sludge and biofilm process described water quality of the pilot plant well. Necessary improvements are also discussed.
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Keywords: ACTIVATED SLUDGE; BIOFILM; IMMOBILIZATION; MODEL; NITROGEN AND PHOSPHORUS REMOVAL; WASTEWATER TREATMENT

Document Type: Research Article

Publication date: 1999-07-01

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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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