Kinetics of ferrihydrite reduction in a biofilm system

Wang, Shuai1; Gao, Kun1; Zhang, Kefeng1,2; Zhou, Wenjing1; Wang, Xiaoxiang3; Liu, Chongxuan1

2024-06-15

10.1016/j.gca.2024.05.003

GEOCHIMICA ET COSMOCHIMICA ACTA   影响因子和分区

0016-7037

1872-9533

Microorganisms can exist in both suspended and attached forms in natural and engineered systems. While extensive research has been performed to investigate the bioreduction kinetics of iron oxides by suspended microorganisms, the kinetics of iron oxide reduction by biofilms has not been well studied. This study investigated the rates of ferrihydrite bioreduction by biofilms of Shewanella oneidensis MR -1 with variable concentration ratios of electron donor to acceptor, and different biofilm thickness. Results indicated that the bioreduction rate of ferrihydrite by biofilms increased with increasing biofilm surface area and was faster than that by suspended microorganisms for the same biomass amount, apparently as a result of the biofilm surface area facilitating the direct contact between ferrihydrite and microorganisms for electron transfer. Increasing biofilm thickness decreased bioreduction rate for the same total biomass as a result of the decrease of the ratio of the biofilm surface area to total biomass. The bioreduction rate increased with increasing electron donor and ferrihydrite inputs, consistent with the saturation type of kinetic models. The different rates of ferrihydrite reduction in the biofilm system resulted in different rates of Fe(II) production as a function of electron donor, acceptor, and biofilm surface area, which in turn affected the type and concentrations of the secondary iron minerals, such as lepidocrocite and goethite. A kinetic model was developed that integrates biofilm surface area, and electron donor and acceptor concentrations that well described the measured rates of ferrihydrite bioreduction. The results emphasized the importance of the biofilm surface area in understanding and modeling iron redox biogeochemistry and iron -related biogeochemical processes.

Ferrihydrite Dissimilatory microbial iron reduction Biofilm Shewanella oneidensis Kinetics Metabolism Secondary mineral formation

SCI

英语

第一 ; 通讯

National Natural Science Foundation of China[41830861] ; Program for Guangdong Introducing Innovative and Entrepreneurial Teams[2017ZT07Z479]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001245870400001

PERGAMON-ELSEVIER SCIENCE LTD

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
2.China Univ Geosci Wuhan, Sch Environm, Wuhan 430074, Peoples R China
3.Shenzhen Polytech Univ, Inst Carbon Neutral Technol, Shenzhen 518055, Peoples R China

Wang, Shuai,Gao, Kun,Zhang, Kefeng,et al. Kinetics of ferrihydrite reduction in a biofilm system[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2024,375.

Wang, Shuai,Gao, Kun,Zhang, Kefeng,Zhou, Wenjing,Wang, Xiaoxiang,&Liu, Chongxuan.(2024).Kinetics of ferrihydrite reduction in a biofilm system.GEOCHIMICA ET COSMOCHIMICA ACTA,375.

Wang, Shuai,et al."Kinetics of ferrihydrite reduction in a biofilm system".GEOCHIMICA ET COSMOCHIMICA ACTA 375(2024).