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Water 2018, 10(2), 219; https://doi.org/10.3390/w10020219

Trophic State and Oxygen Conditions of Waters Aerated with Pulverising Aerator: The Results from Seven Lakes in Poland

1
Department of Chemistry, Microbiology and Environmental Biotechnology, West Pomeranian University of Technology Szczecin, ul J.Słowackiego 17, 71-434 Szczecin, Poland
2
Department of General Zoology, University of Szczecin, ul. Felczaka 3c, 71-412 Szczecin, Poland
*
Author to whom correspondence should be addressed.
Received: 30 November 2017 / Revised: 13 February 2018 / Accepted: 13 February 2018 / Published: 18 February 2018
(This article belongs to the Special Issue Eutrophication of Waterways: An Old Problem with Modern Consequences)
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Abstract

Eutrophic lakes of all types are marked by oxygen shortage in the bottom waters during the summer season, which results in excessive release of phosphorus load. Therefore, numerous restoration activities (chemical precipitation, aeration) are being taken based on bottom-up control, which consists of limiting the nutrient pool available to lower trophic levels. The present study provides an efficiency analysis of pulverising aeration of waters in two stratified and five unstratified lakes located in Poland. The assessment was based on monitoring data (dissolved oxygen concentration (DO), % oxygen saturation (DO%), visibility of the Secchi disc (ZSD), the concentrations of: chlorophyll a (CHL), total phosphorus (TP) and total nitrogen (TN)) obtained before and after installation of the aerator on the lakes. The study was conducted during the spring and the summer seasons. Throughout the study period, the stratified lakes exhibited oxygen saturation <0.1%. Having completed the restoration activities, TN:TP ratio was found to gradually increase in all analysed lakes, which indicates that aeration may decrease phosphate content in the water column. In three lakes, the ratio was > 17, so phosphorus became the most growth-limiting nutrient. The restoration activities on four unstratified lakes had no significant effect on the changes of the Carlson trophic state indices (TSI). Either individual values of the TSI(TP), TSI(CHL) and TSI(ZSD) were comparable, or the value of TSI(TP) was higher than one or both of the remaining indices for all of the lakes. View Full-Text
Keywords: pulverising aeration; oxygen conditions; trophic state; lakes pulverising aeration; oxygen conditions; trophic state; lakes
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Siwek, H.; Włodarczyk, M.; Czerniawski, R. Trophic State and Oxygen Conditions of Waters Aerated with Pulverising Aerator: The Results from Seven Lakes in Poland. Water 2018, 10, 219.

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