Treatment of total petroleum hydrocarbon by free water surface constructed wetland: Effects of different combinations of submerged and free-floating plants

Wei Wu; Xiaojin Hu; Huijun Xie; Zhen Hu; Shuang Liang; Zizhang Guo

Desalination and Water Treatment (Jan 2025)

Treatment of total petroleum hydrocarbon by free water surface constructed wetland: Effects of different combinations of submerged and free-floating plants

Wei Wu,
Xiaojin Hu,
Huijun Xie,
Zhen Hu,
Shuang Liang,
Zizhang Guo

Affiliations

Wei Wu: Environment Research Institute, Shandong University, Qingdao 266237, China
Xiaojin Hu: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
Huijun Xie: Environment Research Institute, Shandong University, Qingdao 266237, China; Corresponding author.
Zhen Hu: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
Shuang Liang: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
Zizhang Guo: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China

Journal volume & issue: Vol. 321
p. 100908

Abstract

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Submerged and free-floating plants in free water surface constructed wetland (FWSCW) play a crucial role in pollutant removal, but their combined effectiveness for total petroleum hydrocarbon (TPH) removal remains unclear. In this study, four lab-scale FWSCWs with different combinations of submerged and free-floating plants (CW1: E. crassipes and V. natans, CW2: E. crassipes and M. aquaticum, CW3: L. laevigatum and V. natans, and CW4: L. laevigatum and M. aquaticum) were established to investigate the TPH removal of FWSCW. CW4 achieved satisfactory removal of TPH and other contaminants, with a 3.15–12.5 % TPH removal efficiency improvement compared to other FWSCW. The TPH concentration in plants and total biomass in CW4 were significantly higher than those in other FWSCW (p < 0.05), which was attributed to the strong TPH bioaccumulation capacity of M. aquaticum. Further analysis showed the correlation between TPH removal efficiency and the TPH concentration in M. aquaticum (p < 0.05), which may be caused by the outstanding TPH bioaccumulate and transport ability of M. aquaticum. TPH removal was also correlated with the removal of TP, COD and NH4+-N (p < 0.05). Abovementioned results provided scientific basis to selection and combination of submerged and free-floating plants during TPH removal in FWSCW.

Published in Desalination and Water Treatment

ISSN: 1944-3994 (Print); 1944-3986 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Technology: Environmental technology. Sanitary engineering; Science: Biology (General): Ecology
Website: https://www.sciencedirect.com/journal/desalination-and-water-treatment

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