Design and testing of a novel hypolimnetic oxygenation system to improve water quality in Lake Bard, California
| Autor: | Jean-François Debroux, Marc W. Beutel, Susan Mulligan, Craig M. Thompson |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Lake and Reservoir Management. 28:245-254 |
| ISSN: | 2151-5530 1040-2381 |
| DOI: | 10.1080/07438141.2012.716501 |
| Popis: | Hypolimnetic oxygenation, the engineered addition of oxygen gas to the bottom of lakes and reservoirs, can improve water quality by repressing the accumulation of nutrients, metals, and toxic compounds in bottom waters. This study designed and tested an oxygenation system in Lake Bard, California. Hypolimnetic oxygen demand, a key design parameter, was estimated through the combination of sediment–water chamber incubations and numerical analysis of water column dissolved oxygen (DO) profiles. Chamber incubations showed that increased water velocity near the sediment–water interface substantially increased the rate of sediment oxygen uptake, and this observation was incorporated into system sizing. The chamber study also confirmed that maintenance of oxygenated conditions repressed sediment release of phosphate, ammonia, manganese, and sulfide. Phosphorus and manganese release rates were 6–8 mg/m2/d and 2–5 mg/m2/d under anoxic conditions, respectively, but negligible or negative under oxic condit... |
| Databáze: | OpenAIRE |
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