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Full-scale test of methanol addition for enhanced nitrogen removal in a Ludzack–Ettinger process

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Methanol addition to a Ludzack–Ettinger process was tested as a short-term means of decreasing effluent nitrogen concentrations. Results from three experiments yielded gains of 0.05 to 0.11 mg nitrate decreased per milligram methanol added. Applications of the International Association on Water Pollution Research and Control Activated Sludge Model No. 1 corroborated these gains, suggesting that the activated sludge was able to metabolize the added methanol without acclimation. Model runs indicated that 70 to 80% of the increased nitrogen removal was from enhanced denitrification, with the balance from increased uptake of nitrogen for biosynthesis.


Document Type: Research Article


Publication date: 1998-05-01

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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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