Coupled Hydro-Biogeochemical Processes Controlling Cr Reductive Immobilization in Columbia River Hyporheic Zone

Liu, Yuanyuan1; Xu, Fen1,2; Liu, Chongxuan1,3

2017-02-07

10.1021/acs.est.6b05099

ENVIRONMENTAL SCIENCE & TECHNOLOGY   影响因子和分区

0013-936X

1520-5851

An experiment and modeling study was conducted to investigate coupled hydro-biogeochemical processes controlling reductive immobilization of groundwater Cr in the hyporheic zone (HZ) at the U.S. Department of Energy's Hanford Site, where dynamic surface water groundwater exchange occurs on a daily basis. Experiments were performed to calibrate kinetic models, and the calibrated models were incorporated into a multicomponent reactive transport model to simulate Cr redox transformation and immobilization under field hydrological conditions. The results revealed that the rates of Cr(VI) reduction, Cr(III) accumulation, and Cr(VI) release to the river are mostly affected by dynamic sediment redox conditions represented by Fe(II) reactivity, which is controlled by its cyclic interaction with O-2 carried by river water, microbial activities, and the supply and bioavailability of organic carbon (OC) that is present in the HZ and/or carried by transport. In addition, the HZ geophysical properties including hydraulic conductivity and the thickness of the top alluvial layer have a significant influence on Cr reactive transport and immobilization by controlling residence times for reactions and the supply rates of O-2, Cr, and OC into the HZ. The results provide important insights into the dynamic redox environments in the HZ that can reductively immobilize contaminants.

SCI ; EI

英语

NI期刊

通讯

China Postdoctoral Science Foundation[2015M582305]

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:000393738700058

AMER CHEMICAL SOC

20172403766466

Biogeochemistry ; Groundwater ; Iron compounds ; Organic carbon ; Process control ; Rivers ; Stream flow

Waterways:407.2 ; Groundwater:444.2 ; Geochemistry:481.2 ; Organic Compounds:804.1

ENVIRONMENT/ECOLOGY

Web of Science

1.Pacific Northwest Natl Lab, Richland, WA 99354 USA
2.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China

Liu, Yuanyuan,Xu, Fen,Liu, Chongxuan. Coupled Hydro-Biogeochemical Processes Controlling Cr Reductive Immobilization in Columbia River Hyporheic Zone[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017,51(3):1508-1517.

Liu, Yuanyuan,Xu, Fen,&Liu, Chongxuan.(2017).Coupled Hydro-Biogeochemical Processes Controlling Cr Reductive Immobilization in Columbia River Hyporheic Zone.ENVIRONMENTAL SCIENCE & TECHNOLOGY,51(3),1508-1517.

Liu, Yuanyuan,et al."Coupled Hydro-Biogeochemical Processes Controlling Cr Reductive Immobilization in Columbia River Hyporheic Zone".ENVIRONMENTAL SCIENCE & TECHNOLOGY 51.3(2017):1508-1517.