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Effect of operating variables on nitrification rates in trickling filters

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A 2-year pilot study was conducted by the City of Malmö, Sweden, to determine the maximum capacity of existing trickling filters when converted from carbonaceous duty to nitrification duty. Operating variables examined included a comparison of alternating two-stage to single-stage operation, flushing intensity, and predator control techniques. Distributor speed control had only a small effect on nitrification efficiency, and motorized distributors are not required in this application. Two-stage operation in an alternating ode provided for higher nitrification rates and lower effluent ammonia values than in single-stage operation. A nitrification model was used to analyze reaction rate data. The analysis showed that alternating two-stage operation mitigated the suppressing effect of influent suspended solids, resulting in enhanced nitrification rates. The filter macrofauna were dominated by worms rather than filter flies, so that regular filter flooding did not enhance nitrification rates.


Document Type: Research Article


Publication date: 1995-11-01

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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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