EFFECT OF BIOFILM ON SUSPENDED PARTICLES TRANSPORT IN POROUS MEDIA BASED ON LBM-DEM COUPLING

HONG Yiqun; CHEN Liping; GONG Yanfeng; XUE Fangling; ZHOU Yanjie; WANG Shiling

doi:DOI:10.13205/j.hjgc.202207015

Volume 40 Issue 7

Sep. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(7): 101-108

LV Shuangru, JIN Yanjun, LIU Guotao, REN Fumin, XI Chenggang, LU Tong, ZHU Jintong, ZHANG Chao. CHARACTERISTICS OF RESIDENTIAL DECORATION WASTE GENERATION AND MANAGEMENT COUNTERMEASURES:A CASE STUDY ON OLD PALACE AREA IN DAXING DISTRICT,BEIJING[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(7): 186-192. doi: DOI:10.13205/j.hjgc.202207027

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HONG Yiqun, CHEN Liping, GONG Yanfeng, XUE Fangling, ZHOU Yanjie, WANG Shiling. EFFECT OF BIOFILM ON SUSPENDED PARTICLES TRANSPORT IN POROUS MEDIA BASED ON LBM-DEM COUPLING[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(7): 101-108. doi: DOI:10.13205/j.hjgc.202207015

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EFFECT OF BIOFILM ON SUSPENDED PARTICLES TRANSPORT IN POROUS MEDIA BASED ON LBM-DEM COUPLING

doi: DOI:10.13205/j.hjgc.202207015

1. College of Urban Construction, Nanjing Tech University, Nanjing 211816, China;
2. Yancheng Polytechnic College, Yancheng 224055, China

Received Date: 2021-08-10
Available Online: 2022-09-02

Abstract

Abstract

Biofilm is a common bacterial community in porous media,which can interact with suspended particles and affect the migration and deposition of particles.The Lattice Boltzmann-discrete element coupling method (LBM-DEM) was used to study the migration of suspended particles in porous media covered with biofilm.The presence of biofilms reduced the pore-throat size and the DLVO repulsive barrier,which helped enhance the deposition of suspended particles.The pressure difference between inlet and outlet was the main factor affecting the retention rate of particles.Under low-pressure difference between inlet and outlet,particles couldn't break through the exclusion barrier,and the flow force of high-pressure difference could increase the permeability by changing the deposition position of the particles.The change of ion concentration in the solution mainly affected the exclusion barrier.In the solution with high ion concentration,the particle retention rate had little response to the change of pressure difference.In the solution with low ion concentration,the particle retention was greatly affected by the inlet and outlet pressure difference.In addition,the effects of inflow velocity on the adhesion and rolling of suspended particles were also observed from a mesoscopic perspective.The angle between the initial deposition points of particles and the incoming flow direction decreased with the increase of particle velocity.
- biofilm,
- porous media,
- particle deposition,
- Lattice Boltzmann method,
- discrete element method

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References

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沈阳化工大学材料科学与工程学院沈阳 110142

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