Improving the Effectiveness of a Nutrient Removal System Composed of Microalgae and Daphnia by an Artificial IlluminationReportar como inadecuado




Improving the Effectiveness of a Nutrient Removal System Composed of Microalgae and Daphnia by an Artificial Illumination - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Department of Environmental Science, Kangwon National University, 313 Natural Science Building 2, Chuncheon, 200-701, Kangwon-do, Korea





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Abstract For determining the effect of illumination on nutrient removal in an artificial food web AFW system, we launched a pilot continuous-flow system. The system consisted of a storage basin, a phytoplankton growth chamber, and a zooplankton growth chamber. A 25,000 Lux AFW-light emitting diode LED on system and an AFW-LED off system were separately operated for 10 days. In the AFW-LED on system, the maximum chlorophyll-a concentration of the phytoplankton chamber was four times higher than that of the AFW-LED off system. With artificial nighttime illumination, the microalgae became both smaller and more nutritious; the microalgae became high quality food for the zooplankton, Daphnia magna. Consequently, this zooplankton became more efficient at extracting nutrients and grew more densely than in the AFW-LED off system condition. In the LED-on condition, the amounts of total nitrogen TN and total phosphorus TP flowing into the system for 10 days were 84.7 g and 20.4 g, and the amounts flowing out were 19.5 g 23% and 4.0 g 20%, respectively. In contrast, in the LED-off condition, 83.8 g and 20.6 g of TN and TP flowed into the system while 38.8 g 46% and 6.8 g 33% flowed out, respectively. Artificial illumination significantly improves the removal rate of nutrients in an AFW system. View Full-Text

Keywords: artificial food web system; nutrient removal; artificial illumination; light-emitting diode; phytoplankton; zooplankton; ecological engineering artificial food web system; nutrient removal; artificial illumination; light-emitting diode; phytoplankton; zooplankton; ecological engineering





Autor: In-Ho Chang, Dawoon Jung and Tae Seok Ahn *

Fuente: http://mdpi.com/



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