Research
| Title： | Eutrophication level constrains treatment efficacy of calcium peroxide in aquatic environments |
|---|---|
| First author： | Zhang, Yuheng; Fang, Lingchao; Qi, Qingsong; Tian, Chuming; Wan, Dong; Song, Gaofei; Mi, Wujuan; Huang, Weichao; Bi, Yonghong; Liu, Changzi |
| Journal： | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING |
| Years： | 2025 |
| DOI： | 10.1016/j.jece.2025.118846 |
| Abstract： | Eutrophication management in aquatic ecosystems is crucial for maintaining water quality and biodiversity. As a green and environmentally friendly treatment agent with sustained-release properties, calcium peroxide (CaO2, CP) has been widely applied in eutrophication management, particularly for its ability to inhibit algal growth and improve water quality, but its effects in different waters with varying degrees of eutrophication level remain to be thoroughly investigated. To fulfill this gap, this study was conducted to screen the short-term effects of CP treatment on waters with different levels of eutrophication. The results showed that CP significantly reduced algal biomass and improved water quality by increasing dissolved oxygen (DO) and pH, while decreasing total nitrogen (TN) and total phosphorus (TP) concentrations. Moreover, CP's impact on zooplankton exhibited a gradient response to eutrophication: selective elimination of sensitive species in lightly eutrophic waters, whereas in moderately to highly eutrophic waters, synergistic stress led to comprehensive community collapse, amplifying ecological risks through combined toxicity and environmental degradation. Concurrently, CP altered the bacterial community structure, reducing the relative abundance of dominant species and decreasing the complexity and stability of the bacterial community network. Furthermore, cyanobacterial cell density was confirmed to be a key factor limiting the selective adjustment of CP on phytoplankton communities. As the degree of eutrophication intensified, the disposal effects varied: accelerated pH elevation, reduced H2O2 release, and shortened DO persistence, coupled with increased dissolved organic carbon (DOC), constrained the overall effectiveness of CP on water quality, bacterial, and phytoplankton communities. These research findings provided a basis for the practical application of CP in eutrophication management. |
