Zhimiao Zhao1,2, Xiao Zhang1,2, Mengqi Cheng1,2, Xinshan Song3, Yinjiang Zhang1,2, Xiangmei Zhong1,2. 1. College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China. 2. Engineering Research Center for Water Environment Ecology in Shanghai, Shanghai, 201306, China. 3. State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, People's road 2999, Donghua University academic building NO.4, office 5153, Songjiang District, Shanghai, 201620, China. newmountain@dhu.edu.cn.
Abstract
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 .
The effects of various combinations of class="Chemical">iron comclass="Chemical">pounds on the contaminant removal class="Chemical">performance in constructed wetlands (CWs) were exclass="Chemical">plored under various initial class="Chemical">pan class="Chemical">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 .
Entities:
Keywords:
Combinations of iron compounds; Microbial community optimization; Multiple contaminants; Oxidation-reduction
Authors: Zhao Zhimiao; Song Xinshan; Xiao Yanping; Zhao Yufeng; Gong Zhijie; Lin Fanda; Ding Yi; Wang Wei; Qin Tianling Journal: Sci Total Environ Date: 2016-09-04 Impact factor: 7.963
Authors: J Mohanakrishnan; O Gutierrez; K R Sharma; A Guisasola; U Werner; R L Meyer; J Keller; Z Yuan Journal: Water Res Date: 2009-06-17 Impact factor: 11.236