Enhanced Removal of Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) in Constructed Wetlands: Iron Cycling and Microbial Mechanisms

• DOI: 10.1021/acsestwater.2c00250
• Publication Date: 2023-01-27T18:19:16Z
• Authors: Yan Kang; Zizhang Guo; Haoqin Ma; Haiming Wu; Jian Zhang
• Keywords: Perfluorooctanoic acid; Perfluorooctane

Perfluoroalkyl substances (PFAS) are persistent and ecotoxic chemicals in aquatic environments. To date, little is known about measures for strengthening PFAS removal constructed wetlands (CWs). In this study, the role of iron oxide iron-reducing bacteria (FeRB) perfluorooctanoic acid (PFOA) perfluorooctane sulfonate (PFOS) was investigated CWs. The efficiencies PFOA PFOS effluent were improved by 33.0 40.8%, respectively, CWs with FeRB. acetate as an intermediate product also detected. content 86.7% lower at a substrate depth poor oxygen. Almost 5.07% 24.6% absorbed substrate. Iron increased proportion Proteobacteria, especially β-Proteobacteria. Increased proportions genes that related to reduction or oxidation, e.g., c-type cytochrome, reductase, PilA, MtrC, MtrD, MshA, FccA genes, detected, which contributed cycle results. Meanwhile, enhanced function carbohydrate metabolism greater involved decarboxylation (M00357; Methanosarcina Methanothrix) played important removal. Given increasing concerns PFAS, study provides effective ecological situ bioremediation method