Enhancement of glucocorticoid reduction transformation by PRB modified with rGO@nZVI-BC
SUN Bo-yu1, HAN Dong-mei2, MA Wei-fang1
1. School of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; 2. Beijing Energy Conservation and Environmental Protection Center, Beijing 101160, China
Abstract：In order to synthesize an environmentally useful material, rGO@nZVI-BC, and to design a permeable reactive barrier (PRB) employing this material for the effective removal of fluorinated glucocorticoids (FGCs) from groundwater. The results indicated that the inhibitory process could be represented using an improved Yoon-Nelson model, with adsorption and biodegradation rate constants of 0.485 and 0.035d-1, 0.233 and 0.029d-1, respectively, in rGO@nZVI-BC and soil systems. The primary mechanism for increasing the efficacy of the process is by strengthening the adsorption and biodegradation activities. At the first stage of operation, adsorption was found to be the dominant mechanism, accounting for approximately 76.12% of the total removal. The mechanism of bioaugmentation is that nZVI acts as an electron donor for the reduction of GCs, thus, enhancing the defluorination reduction function. This component contributed to approximately 87.06% of the total, which is accompanied by dehydroxylation, oxidative side chain degradation, and ring-opening degradation. Additionally, the increased relative abundance of the functional bacteria belonging to the reductive dehalogenation taxa (Xanthomonadaceae, Desulfuromonas, and Sphingomonadaceae) indicated the efficiency of rGO@nZVI-BC. This research provides a practical strategy for preventing and controlling the contamination of groundwater.
孙博宇, 韩东梅, 马伟芳. rGO@nZVI-BC修饰的PRB增强糖皮质激素还原转化性能研究[J]. 中国环境科学, 2022, 42(7): 3212-3223.
SUN Bo-yu, HAN Dong-mei, MA Wei-fang. Enhancement of glucocorticoid reduction transformation by PRB modified with rGO@nZVI-BC. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3212-3223.
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