National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu(SEPSORSLD), State Environmental Protection Key Laboratory for Lake Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China; College of Water Sciences, Beijing Normal University, Beijing, 100875, PR, China.
School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China.
J Environ Manage. 2021 Aug 15;292:112578. doi: 10.1016/j.jenvman.2021.112578. Epub 2021 May 7.
To investigate the effect of a constructed wetland (CW) with steel slag as the filler on water contaminated by low phosphorus levels, a multistage pond CW system was designed in this study. Low-phosphorus polluted river water was used as the research object. This study explored the effects of using steel slag as a CW filler on phosphorus removal and the total phosphorus (TP) purification effect of the wetland system. The results showed that the TP removal rates in the ecological pond, oxidation pond, surface flow wetlands and submerged plant pond were 5.17%, 8.02%, 21.56%, and 16.31%, respectively. Intermittent increases in phosphorus concentration were observed in the reactors and were caused by the decay of plant tissues, which released pollutants. Because steel slag was added to the filler, the TP concentrations in the effluent of the first- and second-level horizontal subsurface CWs increased by 151.13% and 16.29%, respectively, compared to the influent concentration. The 20th to 40th days of the test run was a period of rapid phosphorus release of the system. The use of steel slag has a potential risk of phosphorus release when applied in CWs used to purify low-phosphorus contaminated water bodies.
为了研究以钢渣为填料的人工湿地对低磷污染水的处理效果，本研究设计了多级塘人工湿地系统。以低磷污染河水为研究对象，探讨了钢渣作为人工湿地填料对磷去除和湿地系统总磷（TP）净化效果的影响。结果表明，生态塘、氧化塘、表面流湿地和潜流植物塘的 TP 去除率分别为 5.17%、8.02%、21.56%和 16.31%。反应器中磷浓度间歇性增加，是由于植物组织的腐烂释放出污染物所致。由于在填料中添加了钢渣，因此与进水浓度相比，一、二级水平潜流人工湿地的出水 TP 浓度分别增加了 151.13%和 16.29%。试验运行的第 20-40 天是系统快速释放磷的时期。在用于净化低磷污染水体的人工湿地中使用钢渣可能存在磷释放的潜在风险。
