Effects and mechanisms of calcium peroxide on purification of severely eutrophic water
Effects and mechanisms of calcium peroxide on purification of severely eutrophic water
复制标题
过氧化钙净化严重富营养化水体的效果及机制
DOI：
10.1016/j.scitotenv.2018.10.040
复制
发表时间：
2019
影响因子：
9.8
通讯作者：
Zhao Jing Chan
中科院分区：
文献类型：
--
作者：
Wang Yi;Wang Wen Huai;Yan Fei Long;Ding Zhuo;Feng Lin Lin;Zhao Jing Chan
In consideration of severe eutrophication of scenic water caused by pollutants released from sediments in summer, calcium peroxide (CaO2) was adopted as the slow release peroxide to improve the water quality in a field experiment of 600 m2. The effect of CaO2on the overlying water, interstitial water, sediment, and sediment microorganisms of scenic water was studied. Results for two months indicated that the dissolved oxygen (DO) concentration of the overlying water in the test zone was 3.78 times that in the control zone; the oxidation–reduction potential (ORP) in the overlying water and sediment increased significantly (p= 0.002 andp= 0). Meanwhile, CaO2could effectively inhibit the release of nitrogen (N) and phosphorus (P) from the sediment and could obviously reduce the concentrations of N and P in the overlying water by enhancing the microbiological action. Moreover, the average concentrations of total nitrogen and total phosphorus in the overlying water of the test zone were 46.27% and 50.51% of those in control zone, respectively, and the concentrations of N and P in the interstitial water decreased during the entire experiment. In addition, CaO2decreased the relative abundance of anaerobic bacteria in the sediment, whereas it increased that of aerobic bacteria and promoted the appearance of the functional bacteria, such asNitrospiraeandThermodesulfoba. In conclusion, CaO2can improve the DO and ORP in the eutrophic water effectively and change the microbial community in the sediment to a certain extent, thereby controlling the pollutants released from the sediment and reducing the N and P concentrations in the overlying water. Thus, CaO2can effectively realize the purification and restoration of the severely eutrophic scenic water.
