Abstract
Constructed wetland (CW), an ecological water treatment system, can purify and repair the damaged saline water body in an open watershed, but its repairing function is limited at low temperature under salt stress. In this study, two different plant species with slag-sponge layer were operated to enhance the purification effect of CW on the damaged saline water body. The results showed that the combination of Scirpus mariqueter and slag-sponges in CW had a better purification effect especially under the condition of salinity of 10‰ (S = 10) with a respective removal efficiency of 91.04% of total nitrogen, 80.07% of total phosphorus, and 93.02% of COD in high temperature (25 ~ 35 °C). Furthermore, ecological traits (enzyme activity and amino acids) of plants, the abundance and distribution of functional microorganisms on the surface of slag-sponges, and the microbial state on the substrate surface of the denitrifying zone of CW were analyzed to explain how exactly the combinations worked. It was found that the enrichment of functional microorganisms in slag-sponge and the anaerobic zone of plants have improved the nitrogen and phosphorus removal. Plants maintained high enzyme activities and the ability to synthesize key amino acids under salt stress to ensure the growth and reproduction of plants and achieve the assimilation function. Scirpus mariqueter combined with slag-sponges in CW effectively improved the purification effect of damaged saline water, indicating that it is an ecological and green saline water treatment way.
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Funding
The authors greatly appreciated the support from the National Natural Science Foundation of China (51909157), Shanghai River and Lake Biological Chain Construction, and Resource Utilization Engineering Technology Research Center (20DZ2250700).
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All authors contributed to the study conception and design. The first draft of the manuscript was written by Mengqi Cheng as well as material preparation, data collection, and former analysis with the help of Xiao Li and Xueqing Gao. Project administration was conducted by Zhimiao Zhao. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Highlights
• Scirpus mariqueter and slag-sponge in CW overcame salt stress and purified water.
• Actinobacteriata and Rhodocyclaceae at species level in CW2-P2 were distributed dominant for better purification.
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Cheng, M., Li, X., Gao, X. et al. Effects of two plant species combined with slag-sponges on the treatment performance of contaminated saline water in constructed wetland. Environ Sci Pollut Res 30, 63592–63602 (2023). https://doi.org/10.1007/s11356-023-26788-7
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DOI: https://doi.org/10.1007/s11356-023-26788-7