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Zhang D, Jiang J, Shi H, Lu L, Zhang M, Lin J, Lü T, Huang J, Zhong Z, Zhao H. Nonionic surfactant Tween 80-facilitated bacterial transport in porous media: A nonmonotonic concentration-dependent performance, mechanism, and machine learning prediction. ENVIRONMENTAL RESEARCH 2024; 251:118670. [PMID: 38493849 DOI: 10.1016/j.envres.2024.118670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 03/06/2024] [Accepted: 03/09/2024] [Indexed: 03/19/2024]
Abstract
The surfactant-enhanced bioremediation (SEBR) of organic-contaminated soil is a promising soil remediation technology, in which surfactants not only mobilize pollutants, but also alter the mobility of bacteria. However, the bacterial response and underlying mechanisms remain unclear. In this study, the effects and mechanisms of action of a selected nonionic surfactant (Tween 80) on Pseudomonas aeruginosa transport in soil and quartz sand were investigated. The results showed that bacterial migration in both quartz sand and soil was significantly enhanced with increasing Tween 80 concentration, and the greatest migration occurred at a critical micelle concentration (CMC) of 4 for quartz sand and 30 for soil, with increases of 185.2% and 27.3%, respectively. The experimental results and theoretical analysis indicated that Tween 80-facilitated bacterial migration could be mainly attributed to competition for soil/sand surface sorption sites between Tween 80 and bacteria. The prior sorption of Tween 80 onto sand/soil could diminish the available sorption sites for P. aeruginosa, resulting in significant decreases in deposition parameters (70.8% and 33.3% decrease in KD in sand and soil systems, respectively), thereby increasing bacterial transport. In the bacterial post-sorption scenario, the subsequent injection of Tween 80 washed out 69.8% of the bacteria retained in the quartz sand owing to the competition of Tween 80 with pre-sorbed bacteria, as compared with almost no bacteria being eluted by NaCl solution. Several machine learning models have been employed to predict Tween 80-faciliated bacterial transport. The results showed that back-propagation neural network (BPNN)-based machine learning could predict the transport of P. aeruginosa through quartz sand with Tween 80 in-sample (2 CMC) and out-of-sample (10 CMC) with errors of 0.79% and 3.77%, respectively. This study sheds light on the full understanding of SEBR from the viewpoint of degrader facilitation.
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Affiliation(s)
- Dong Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, Zhejiang, China
| | - Jiacheng Jiang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, Zhejiang, China
| | - Huading Shi
- Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing, 100012, China.
| | - Li Lu
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, Zhejiang, China
| | - Ming Zhang
- Department of Environmental Science and Engineering, China Jiliang University, Hangzhou, 310018, Zhejiang, China
| | - Jun Lin
- Institute of Carbon Neutrality and New Energy, School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, Zhejiang, China
| | - Ting Lü
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, Zhejiang, China
| | - Jingang Huang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, Zhejiang, China
| | - Zhishun Zhong
- Guangdong Jiandi Agriculture Technology Co. Ltd., Foshan, Guangdong, 528200, China
| | - Hongting Zhao
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, Zhejiang, China.
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Chen J, Zhang Q, Zhu Y, Li Y, Chen W, Lu T, Qi Z. Biosurfactant-mediated mobility of graphene oxide nanoparticles in saturated porous media. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2022; 24:1883-1894. [PMID: 36148869 DOI: 10.1039/d2em00297c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
There is currently a lack of scientific understanding regarding how bio-surfactants influence the mobility of graphene oxide (GO) through saturated porous media. In this study, the transport characteristics of GO through porous media with different heterogeneities (i.e., quartz sand and goethite-coated sand) after the addition of saponin (a representative bio-surfactant) were investigated. The results demonstrated that saponin (3-10 mg L-1) promoted GO mobility in both types of porous media at pH 7.0. This trend was attributed to the competitive deposition between nanoparticles and bio-surfactant molecules for attachment sites, the enhanced electrostatic repulsion, the decreased strain, the presence of steric effects induced by the adsorbed saponin, and the increase in the hydrophilicity of nanoparticles. Intriguingly, saponin promoted GO mobility in goethite-coated sand (i.e., chemically heterogeneous porous media) to a greater extent than that in sand (i.e., relatively homogeneous porous media) when saponin concentrations increased, which stemmed from the differences in the extent of the deposition site competition for saponin on the two porous media and the electrostatic repulsion between GO and the porous media. Furthermore, a cation-bridging mechanism was also involved in the ability of saponin to increase GO mobility when the electrolyte solution was 0.1 mM Cu2+. Moreover, the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory and the colloid transport model were applicable to elucidate the mobility properties of GO with or without saponin in porous media. The findings from this work highlight the important status of bio-surfactants in the fate of colloidal carbon-based nanomaterials in subsurface systems.
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Affiliation(s)
- Jiuyan Chen
- College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, 225009, China.
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Qiang Zhang
- Ecology Institute of the Shandong Academy of Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China
| | - Yuwei Zhu
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Yanxiang Li
- The Testing Center of Shandong Bureau, China Metallurgical Geology Bureau, Jinan 250014, China
| | - Weifeng Chen
- Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education/Fujian Provincial Key Laboratory for Plant Eco-physiology/School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Taotao Lu
- College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, 225009, China.
| | - Zhichong Qi
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
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Bai H, Chen J, Hu Y, Wang G, Liu W, Lamy E. Biocolloid transport and deposition in porous media: A review. KOREAN J CHEM ENG 2022. [DOI: 10.1007/s11814-021-0941-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Bai H, Lamy E. Bacteria transport and deposition in an unsaturated aggregated porous medium with dual porosity. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:18963-18976. [PMID: 32342416 DOI: 10.1007/s11356-020-08783-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
Bacterial transport and deposition play an important role in the assessment and prediction of subsurface pollution risks. Bacteria transport experiments were performed under unsaturated flow conditions in an aggregated porous medium at the laboratory column scale, to investigate how the inter- and intra-aggregated pore space of this medium could affect transport and deposition under unsaturated flow conditions, where inter- and intra-pore spaces are not fully activated. The results obtained through experimental observations and numerical simulations showed that some intra- and inter-pore space of this medium was excluded from bacteria transport and retention, as confirmed by the non-uniform transport of bacteria pathways in the aggregated porous media under unsaturated flow conditions. Capillary energy was higher the than other forces acting at bacteria air-water-solid interfaces. If this energy should contribute in increasing bacteria deposition under unsaturated conditions, similar to what has been reported for sandy media, similar overall retention of E. coli and R. rhodochrous was obtained under unsaturated flow conditions, suggesting that capillary energy was not the driving force for bacteria deposition.
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Affiliation(s)
- Hongjuan Bai
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, 450001, People's Republic of China
- Département de Génie des Procédés Industriels, Laboratoire TIMR, Université de Technologie de Compiègne - Alliance Sorbonne Université, F-60205, Compiègne cedex, France
| | - Edvina Lamy
- Département de Génie des Procédés Industriels, Laboratoire TIMR, Université de Technologie de Compiègne - Alliance Sorbonne Université, F-60205, Compiègne cedex, France.
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