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Control of Microthrix parvicella in Activated Sludge Plants by Dosage of Polyaluminium Salts: Possible Mechanisms by Per H. Nielsen; Caroline Kragelund; Jeppe L. Nielsen; Senada Tiro; Martin Lebek; Karl‐Heinz Rosenwinkel; Amare Gessesse is a Environmental Science article available to read on EtoBox.

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## Abstract An effective control of the filamentous bacterium __Microthrix parvicella__ in activated sludge wastewater treatment plants can take place by dosage of polyaluminium chloride, PAX‐14. The mechanism how it works is largely unknown. The purpose of this study was to investigate in detail the mechanism by which PAX‐14 controls __M. parvicella__. After addition of PAX‐14, a reduction in substrate uptake, measured as uptake of radiolabelled oleic acid and trioleic acid under anaerobic conditions was observed by microautoradiography, indicating an effect on the physiology of __M. parvicella__ or on the ability to transport substrate into the cell. Hydrophobic surface properties of the bacterium were not altered, but a significant reduction of exoenzyme activity was observed after PAX‐14 addition. This was measured as bulk enzyme activity as well as surface‐associated enzyme activity for esterase and lipase. New lipase production was not inhibited, indicating a need for a continuous addition of PAX‐14 for an efficient control of __M. parvicella__. Furthermore, since PAX‐14 is an efficient flocculating agent, it improved formation of dense flocs, so __M. parvicella__ was embedde

Who reads Control of Microthrix parvicella in Activated Sludge Plants by Dosage of Polyaluminium Salts: Possible Mechanisms?

Author

Per H. Nielsen; Caroline Kragelund; Jeppe L. Nielsen; Senada Tiro; Martin Lebek; Karl‐Heinz Rosenwinkel; Amare Gessesse

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0323-4320)

Published

2005

Language

EN

Field

Environmental Science (Physical Sciences)