Lolium Perenne as the Cultivation Plant in Hydroponic Ditch and Constructed Wetland to Improve Wastewater Treatment Efficiency in a Cold Region
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- 作者：Yongxiang Ren ; Yang Liu ; Junfeng Sun ; Hao Lu ; Lei Yang ; Cancan Chen ; Yun Han
- 刊名：Wetlands
- 出版年：2016
- 出版时间：August 2016
- 年：2016
- 卷：36
- 期：4
- 页码：659-665
- 全文大小：582 KB
- 刊物主题：Freshwater & Marine Ecology; Environmental Management; Ecology; Hydrogeology; Coastal Sciences; Landscape Ecology;
- 出版者：Springer Netherlands
- ISSN：1943-6246
- 卷排序：36
文摘
To improve wastewater treatment efficiency by hydroponic ditches (HDs) and hybrid constructed wetlands (CWs) in cold regions and create evergreen landscape in cold periods, a research on them cultivated with Lolium perenne at depths of 10 cm and 60 cm were carried out. Water temperature of 10 °C was as the boundary between cold and non-cold periods. During the 2 years’ experiment, L. perenne grew well, with better growth characteristics in the second year than that in the first year. In the cold period of the second year, when large-area freezing occurred in the culture bed, L. perenne was still clearly proliferating and kept evergreen. Meanwhile, the removal efficiencies of COD, NH4+-N and TP increased, especially NH4+-N removal increasing significantly (p < 0.01), which correlated to the growth characteristics of L. perenne (r = 0.487 ~ 0.837, p < 0.05). In cold period of the second year, although cold climate restricted the pollutants removal, the efficiencies were still maintained around 30.0 %, 50.8 % and 55.8 % in COD removal, 82.8 %, 92.5 % and 68.6 % in NH4+-N removal, and 27.7 %, 40.3 % and 42.3 % in TP removal in the 10 cm HD and the two hybrid CWs. Therefore, L. perenne can be adopted as a cultivated plant in HDs and CWs in cold regions.KeywordsLolium perenneGrowth characteristicsHydroponic ditchesConstructed wetlandsWastewater treatment efficiencyCold period