Aeration as a tool to improve water quality and reduce the growth of hydrilla
| Autor: | Dean F. Martin, Patricia M. Dooris, Thomas N. Cooley |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
Environmental Engineering
biology Chemistry Ecological Modeling Hydrilla Environmental engineering chemistry.chemical_element Oxygenation biology.organism_classification Pollution Nitrogen Animal science Dry weight Total inorganic carbon Water quality Aeration Saturation (chemistry) Waste Management and Disposal Water Science and Technology Civil and Structural Engineering |
| Zdroj: | Water Research. 14:485-489 |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/0043-1354(80)90214-6 |
| Popis: | Aeration of artificial, model lake systems was studied as a tool to improve water quality and to control the growth of a nuisance aquatic weed, Hydrilla verticillata (L.F.) Royle, which has been recognized as a plant pest since the mid-1960s. Aeration decreased the growth of Hydrilla by 20% fresh weight and 18% dry weight on average after 21 days. The effect was due to the oxygenation of the water and not the mechanical effect of the bubbles, as verified by studies using pure nitrogen. Aeration also affected water quality. Inorganic carbon decreased; nitrate-nitrite-nitrogen decreased, more slowly in test systems than in control systems; dissolved oxygen increased to saturation within 24 h and pH increased 0.5–1.5 unit over the period of study. Phosphate-phosphorus concentration was unaffected. The concentrations of zinc, calcium and iron decreased as well. The effect of aeration upon Hydrilla growth appears to be correlated with a decrease of iron. After 7 days, iron concentrations decreased to less than 20 ppb. Iron toxicity is proposed as the mechanism responsible for creating a limiting condition for Hydrilla growth. |
| Databáze: | OpenAIRE |
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