Abstract
Algal communities in hypertrophic lakes show large differences greatly as a consequence of the quality and quantity of nutrient loading. Non-nitrogen-fixing or nitrogen-fixing blue-green algae and green algae are dominating groups. Hypertrophic wastewater recipients are characterized by large external supply of phosphorus and nitrogen, intense algal blooms and phosphorus recycling from sediments. After sewage diversion coupled nitrification-denitrification processes result in reduced nitrogen supply to organisms, and nitrogen-fixing algal communities increase in importance. Recycling of sediment phosphorus is maintained for long periods of time.
Relations between nitrification-denitrification activities, internal phosphorus loading and algal development were studied in whole-lake experiments. Mixing nitrate with superficial sediment led to oxidation of organic matter and to a diminished phosphorus recycling. Low concentrations of Volvox aureus and nanoplankton developed the following summers. Rapid denitrification after addition of nitrate to epilimnetic water in hypertrophic ponds indicated the competitive strength of bacteria over phytoplankton for nitrate. Algal nitrogen fixation was simultaneously repressed, and the dense population of Aphanizomenon flos-aquae was replaced by a more sparse community of Cryptomonas spp, Chroomonas acuta and Volvox aureus for the rest of the growing season.
A new method for the economical and ecological optimization of the function of wastewater treatment plants/recipients is proposed. The method makes use of a nitrification step in the wastewater treatment plant while denitrification is accomplished at the sediment-water interface of the recipient.
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© 1980 Dr. W. Junk b.v. Publishers-The Hague, The Netherlands
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Leonardson, L., Ripl, W. (1980). Control of Undesirable Algae and Induction of Algal Successions in Hypertrophic Lake Ecosystems. In: Barica, J., Mur, L.R. (eds) Hypertrophic Ecosystems. Developments in Hydrobiology, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9203-0_7
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DOI: https://doi.org/10.1007/978-94-009-9203-0_7
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