Influences of Iron Compounds on Microbial Diversity and Improvements in Organic C, N, and P Removal Performances in Constructed Wetlands

• DOI: 10.1007/s00248-019-01379-7
• Publication Date: 2019-04-25T15:05:02Z
• Authors: Zhimiao Zhao; Xiao Zhang; Mengqi Cheng; Xinshan Song; Yinjiang Zhang; Xiangmei Zhong
• Keywords: Bacteria; Nitrogen; Microbiota; Phosphorus; Waste Disposal, Fluid; 01 natural sciences; Carbon; 6. Clean water; Biodegradation, Environmental; 13. Climate action; Wetlands; Water Pollution, Chemical; Iron Compounds; Water Pollutants, Chemical; 0105 earth and related environmental sciences

The effects of various combinations of iron compounds on the contaminant removal performance in constructed wetlands (CWs) were explored under various initial iron concentrations, contaminant concentrations, different hydraulic retention time (HRT), and different temperatures. The Combo 6 (nanoscale zero-valent iron combined with Fe3+) in CW treatments showed the highest pollutant removal performance under the conditions of C2 initial iron dosage concentration (total iron 0.2 mM) and I2 initial contaminant concentration (COD:TN:TP = 60 mg/L:60 mg/L:1 mg/L) in influent after 72-h HRT. These results were directly verified by two different microbial tests (Biolog test and high-throughput pyrosequencing) and microbial community analysis (principal component analysis of community-level physiological profile, biodiversity index, cluster tree, relative abundance at order of taxonomy level). Specific bacteria related to significant improvements in contaminant removal were domesticated by various combinations of iron compounds. Iron dosage was advised as a green, new, and effective option for wastewater treatment. Graphical Abstract .