Environment Research Institute, Shandong University, Qingdao 266237, China.
Environment Research Institute, Shandong University, Qingdao 266237, China.
Sci Total Environ. 2021 Aug 1;780:146637. doi: 10.1016/j.scitotenv.2021.146637. Epub 2021 Mar 21.
Pharmaceuticals and personal care products (PPCPs) cause ongoing water pollution and consequently have attracted wide attention. Constructed wetlands (CWs) show good PPCP removal performance through combined processes of substrates, plants, and microorganisms; however, most published research focuses on the role of substrates and microorganisms. This review summarizes the direct and indirect roles of wetland plants in PPCP removal, respectively. These direct effects include PPCP precipitation on root surface iron plaque, and direct absorption and degradation by plants. Indirect effects, which appear more significant than direct effects, include enhancement of PPCP removal through improved rhizosphere microbial activities (more than twice as much as bulk soil) stimulated by radial oxygen loss and exudate secretions, and the formation of supramolecular ensembles from PPCPs and humic acids from decaying plant materials which improving PPCPs removal efficiency by up to four times. To clarify the internal mechanisms of PPCP removal by plants in CWs, factors affecting wetland plant performance were reviewed. Based on this review, future research needs have been identified.
药品和个人护理产品（PPCPs）造成持续的水污染，因此引起了广泛关注。人工湿地（CWs）通过基质、植物和微生物的综合作用表现出良好的 PPCP 去除性能；然而，大多数已发表的研究都集中在基质和微生物的作用上。本综述分别总结了湿地植物在 PPCP 去除中的直接和间接作用。这些直接作用包括 PPCP 在根表面铁斑上的沉淀，以及植物的直接吸收和降解。间接作用（比直接作用更为显著）包括通过根际微生物活性的增强（比体相土壤高两倍以上）来提高 PPCP 的去除效率，这种增强作用是由径向氧损失和分泌物刺激引起的，以及从衰亡植物材料中分解出来的腐殖酸与 PPCPs 形成超分子聚集体，从而将 PPCPs 的去除效率提高了四倍。为了阐明 CWs 中植物去除 PPCP 的内在机制，综述了影响湿地植物性能的因素。在此基础上，提出了未来的研究需求。
