Next Article in Journal
Planning for Climatic Extremes and Variability: A Review of Swedish Municipalities’ Adaptation Responses
Next Article in Special Issue
Application of On-Site Wastewater Treatment in Ireland and Perspectives on Its Sustainability
Previous Article in Journal / Special Issue
History and Technology of Terra Preta Sanitation
Article Menu

Export Article

Open AccessArticle
Sustainability 2014, 6(3), 1346-1358; doi:10.3390/su6031346

Improving the Effectiveness of a Nutrient Removal System Composed of Microalgae and Daphnia by an Artificial Illumination

Department of Environmental Science, Kangwon National University, 313 Natural Science Building 2, Chuncheon, 200-701, Kangwon-do, Korea
*
Author to whom correspondence should be addressed.
Received: 20 December 2013 / Revised: 27 February 2014 / Accepted: 5 March 2014 / Published: 12 March 2014
View Full-Text   |   Download PDF [613 KB, 24 February 2015; original version 24 February 2015]   |  

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.
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
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Chang, I.-H.; Jung, D.; Ahn, T.S. Improving the Effectiveness of a Nutrient Removal System Composed of Microalgae and Daphnia by an Artificial Illumination. Sustainability 2014, 6, 1346-1358.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sustainability EISSN 2071-1050 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top