The Influence of Temperature on the Effectiveness of Filamentous Bacteria Removal from Activated Sludge by Rotifers
We investigated the feeding of the rotifer Lecane inermis on filamentous bacteria to determine if the ability of rotifers to remove filaments depends on temperature. The bacteria originated from two treatment plants, one of which was dominated by Microthrix parvicella and the other by Nostocoida limicola-like organisms. The experiments showed that the number of rotifers increased with temperature, and thus the ability of rotifers to reduce the number of filaments also increased with temperature. At 8°C, their removal effectiveness was low, but the rotifers were able to survive at this temperature. When presented with sludge containing N. limicola-like microorganisms at 20°C, the rotifers reduced the number of bacteria by 95%. In the case of M. parvicella, the reduction reached 50%. The results confirmed that Lecane are capable of controlling the growth of bacteria responsible for sludge bulking. This is the first report indicating that the seasonality of bulking may be the result of the activity of filamentous bacteria grazers, which is temperature dependent.
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Document Type: Research Article
Publication date: 2012-08-01
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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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