Article: Improving the Effectiveness of a Nutrient Removal System Composed of Microalgae and Daphnia by an Artificial Illumination
Sustainability. 2014 Mar. 12, v. 6, no. 3
2014
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. ... ...
| 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. |
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| Keywords | Daphnia magna ; basins ; chlorophyll ; diodes ; food webs ; growth chambers ; lighting ; microalgae ; nutrients ; phytoplankton ; total nitrogen ; total phosphorus ; zooplankton |
| Language | English |
| Dates of publication | 2014-0312 |
| Size | p. 1346-1358. |
| Publishing place | Multidisciplinary Digital Publishing Institute |
| Document type | Article |
| ZDB-ID | 2518383-7 |
| ISSN | 2071-1050 |
| ISSN | 2071-1050 |
| DOI | 10.3390/su6031346 |
| Database | NAL-Catalogue (AGRICOLA) |
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