School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China.
Tianjin Academy of Environmental Sciences, Tianjin, 300191, China.
Environ Sci Pollut Res Int. 2022 Apr;29(18):26312-26321. doi: 10.1007/s11356-021-17741-7. Epub 2021 Dec 1.
Exploring the fate of nitrogen pollutants in constructed wetlands (CWs) fed by industrial tailwater is significant to strengthen its pollution control and promoting the development of CWs in the field of micro-polluted water treatment. In this study, the distribution coefficients and the environmental risks of nitrogen pollutants between water and sediment of the hybrid CW in Tianjin were systematically investigated. From a spatial perspective, the nitrogen pollutants could be removed in this hybrid CW, and subsurface flow wetland played a key role in nitrogen pollutant removal. From a temporal perspective, the concentration of nitrogen pollutants was largely affected by the dissolved oxygen (DO) and temperature. The distribution coefficient of nitrogen pollutants between water and sediment was further clarified, suggesting that NH-N was more likely to be enriched in sediments due to microbial process. The overall level of pollution in hybrid CW was moderate according to the nutritional pollution index (NPI) analysis. The risk assessment indicated that timely dredging control measures should be considered to maintain the performance of hybrid CW.
探究受工业尾水补给的人工湿地（CWs）中氮污染物的归宿，对于加强其污染控制以及推动 CWs 在微污染水处理领域的发展具有重要意义。本研究系统研究了天津复合式 CW 中氮污染物在水相与底泥之间的分配系数及其环境风险。从空间角度来看，氮污染物可在该复合式 CW 中得到去除，其中潜流湿地对氮污染物去除起关键作用。从时间角度来看，氮污染物浓度受溶解氧（DO）和温度的影响较大。氮污染物在水相与底泥之间的分配系数进一步得到阐明，表明由于微生物过程，NH-N 更易在底泥中富集。根据营养物污染指数（NPI）分析，复合式 CW 的整体污染水平处于中等程度。风险评估表明，应考虑及时采取清淤控制措施，以维持复合式 CW 的性能。
