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

Year: 2024
Type: article
Abstract: 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 NH 4 + -N (p < 0.05). Abovementioned results provided scientific basis to selection and combination of submerged and free-floating plants during TPH removal in FWSCW. • TPH removal efficiency of FWSCW was 78.57 % to 91.07 %. • M. aquaticum increased TPH removal in FWSCW. • Bioaccumulation capacity and plant biomass affected the removal of TPH.
DOI: 10.1016/j.dwt.2024.100908
Authors: Wei Wu, Xiaojin Hu, Huijun Xie, Zhen Hu, Shuang Liang, Zizhang Guo
Institution: Shandong University
Language: English
Open Access status: gold
Estimated APC paid: $1,000
OpenAlex ID: W4404408347
FWCI: 1.83
Cites: 63
Cited by: 7
Related to: 10