Effects of flow-interruption on the bacteria transport behavior in porous media

Ning，Zigong1,2; Li，Rong1,2; Lian，Huishu1; Zhou，Shuang3; Liao，Peng1; Liu，Chongxuan1

2021-04-01

10.1016/j.jhydrol.2020.125677

JOURNAL OF HYDROLOGY   影响因子和分区

0022-1694

1879-2707

Attachment is an important strategy for microorganisms to survive, grow, and perform biogeochemical functions in soil and groundwater systems. This study investigated the effect of flow-interruption (FI) that is common in subsurface environments on bacterial attachment/detachment using a metal-reducing bacterium Shewanella oneidensis strain (MR1) as an example. Column experiments and one dimensional bacterial transport models were performed by varying flow interruption duration, fluid ionic strength, and solid grain surface electrostatic properties with a goal to understand the effect of FI on bacterial attachment/detachment. The results indicated that MR1 generally behaved as colloidal particles in transport and attachment/detachment under continuous flow conditions. However, the FI events induced a significant release of MR1 in both injection and elution phases, showing a peak MR1 concentration, which was higher than that in the injecting solution, immediately after the FI events. The peak MR1 concentrations were higher in systems with lower adhesive forces between bacteria and solid grains, a lower attachment site capacity in porous media, and a longer FI duration. The diffusive release of the previously attached bacteria during the FI events and the momentum force when flow re-started immediately after the FI events were likely the mechanisms leading to bursting release of bacteria with the release concentrations higher than that in the influent solutions. The results have important implication for understanding bacterial migration and attachment, and their subsequent functions, especially in dynamic hydraulic environments such as in hyporheic zones or in soils subject to dynamic changes in infiltration rates under for example extreme precipitation and drought conditions.

Dynamic flow Fluid flow interruption Microbial attachment Biofilms Bacterial detachment

SCI ; EI

英语

第一 ; 共同第一 ; 通讯

National key research and development program[2019YFC1803900] ; Natural Science Foundation of China[41830861] ; China Postdoctoral Science Foundation["2018M641636","2017ZT07Z479"]

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000641592600019

ELSEVIER

20204409434529

Transport properties ; Bacteria ; Ionic strength ; Precipitation (chemical) ; Groundwater ; Infiltration ; Sols ; Flow of fluids ; Adhesives

Groundwater:444.2 ; Fluid Flow, General:631.1 ; Physical Chemistry:801.4 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

ENGINEERING

Web of Science

1.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.College of Environmental Science and Engineering,Nankai University,Tianjin,300350,China
3.Graduate School at Shenzhen,Tsinghua University,Shenzhen,515055,China

Ning，Zigong,Li，Rong,Lian，Huishu,et al. Effects of flow-interruption on the bacteria transport behavior in porous media[J]. JOURNAL OF HYDROLOGY,2021,595.

Ning，Zigong,Li，Rong,Lian，Huishu,Zhou，Shuang,Liao，Peng,&Liu，Chongxuan.(2021).Effects of flow-interruption on the bacteria transport behavior in porous media.JOURNAL OF HYDROLOGY,595.

Ning，Zigong,et al."Effects of flow-interruption on the bacteria transport behavior in porous media".JOURNAL OF HYDROLOGY 595(2021).