Journal
ECOLOGICAL ENGINEERING
Volume 36, Issue 12, Pages 1725-1732Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2010.07.020
Keywords
Wetland; Macrophyte structures; Nutrient removal; Decomposition; Harvest; Lake Taihu
Funding
- China National Fund for Water Pollution Control and Management [2008ZX07101-012, 09SZX11003(290080)]
- World Wiled Fund for Nature (WWF) [CN089601]
- Natural Science Foundation of China [40901252]
Ask authors/readers for more resources
A natural wetland of about 12000 m(2) along the east coast of Lake Taihu was separated into five subzones with different macrophyte structures to investigate their nutrient removal dynamics. Wastewater was continuously pumped into the wetland from July 2008 to June 2009 at an average rate of 22 m(3)/h. Neighboring natural wetland with high density of macrophyte was chosen as a comparison site. The removal of TN, TDN, TP, and TDP in the experimental wetlands as a whole was about 79.3,54.5, 4.5, and 3.4 kg, respectively. The decrease of nitrogen concentration was more pronounced in winter (January-March) 2009, representing a respective reduction of 46.4%, 48.0%, and 47.9% in TN, TDN, and NH4-N concentration. Results reveal a higher nutrient removal potential in wetland dominated by Typha orientalis Presl, Zizania latifolia Turcz, and Hemarthria sibirica under high nutrient load. However, areas dominated by Zizania latifolia Turcz. Nelumbo nucifera Gaertn, and Ceratophyllum demersum L. had better purification performance when the above-water-surface macrophytes were harvested frequently. Dissolved oxygen, pH, and oxidation-reduction potential decreased with the increase of the percentage of Zizania latifolia Turcz-dominated macrophytes. High nutrient concentration in the comparison site and net increase of NH4-N in Z1 indicate the possibility of water re-pollution by intense macrophyte decomposition. Furthermore, results suggest that harvesting macrophytes has potential ability in nitrogen, especially ammonium nitrogen removal, and hence could be considered in wetland construction for lake restoration. (C) 2010 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available