Purification Efficiency of Three Combinations of Native Aquatic Macrophytes in Artificial Wastewater in Autumn

Lei Xu, Siyu Chen, Ping Zhuang, Dongsheng Xie, Xiaoling Yu, Dongming Liu, Zhian Li, Xinsheng Qin, Faguo Wang and Fuwu Xing
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Lei Xu: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
Siyu Chen: School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China
Ping Zhuang: Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
Dongsheng Xie: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
Xiaoling Yu: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
Dongming Liu: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
Zhian Li: Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
Xinsheng Qin: College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
Faguo Wang: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
Fuwu Xing: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China

IJERPH, 2021, vol. 18, issue 11, 1-13

Abstract: Water pollution caused by excessive nutrient and biological invasion is increasingly widespread in China, which can lead to problems with drinking water as well as serious damage to the ecosystem if not be properly treated. Aquatic plant restoration (phytoremediation) has become a promising and increasingly popular solution. In this study, eight native species of low-temperature-tolerant aquatic macrophytes were chosen to construct three combinations of aquatic macrophytes to study their purification efficiency on eutrophic water in large open tanks during autumn in Guangzhou City. The total nitrogen (TN) removal rates of group A ( Vallisneria natans + Ludwigia adscendens + Monochoria vaginalis + Saururus chinensis ), group B ( V. natans + Ipomoea aquatica + Acorus calamus + Typha orientalis ), and group C ( V. natans + L. adscendens + Schoenoplectus juncoides + T. orientalis ) were 79.10%, 46.39%, and 67.46%, respectively. The total phosphorus (TP) removal rates were 89.39%, 88.37%, and 91.96% in groups A, B, and C, respectively, while the chemical oxygen demand (COD) removal rates were 93.91%, 96.48%, and 92.78%, respectively. In the control group (CK), the removal rates of TN, TP, and COD were 70.42%, 86.59%, and 87.94%, respectively. The overall removal rates of TN, TP, and COD in the plant groups were only slightly higher than that in CK group, which did not show a significant advantage. This may be related to the leaf decay of some aquatic plants during the experiment, whereby the decay of V. natans was the most obvious. The results suggest that a proper amount of plant residue will not lead to a significant deterioration of water quality.

Keywords: aquatic plants; nitrogen and phosphorus; purification efficiency (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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