PMID- 37514421
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230731
IS  - 2073-4360 (Electronic)
IS  - 2073-4360 (Linking)
VI  - 15
IP  - 14
DP  - 2023 Jul 13
TI  - Transport of Organic Contaminants in Composite Vertical Cut-Off Wall with 
      Defective HDPE Geomembrane.
LID - 10.3390/polym15143031 [doi]
LID - 3031
AB  - Soil-bentonite vertical cut-off wall is an emergency technique used for 
      contaminant control in geo-environmental engineering, high-density polyethylene 
      (HDPE) geomembrane (GM) with an extremely low-permeability coefficient is 
      expected to enhance the contaminant barrier effect of the vertical cut-off wall. 
      To evaluate the barrier performance of the composite barrier composed of GM and 
      soil-bentonite mixture towards organic contaminant, while also quantitively 
      revealing the impact of GM defects and placement, a one-dimensional transport 
      model for organic contaminants in composite barrier is solved under semi-infinite 
      boundary conditions. The proposed transport model is validated by numerical 
      simulations using COMSOL Multiphysics 5.4, and the effects of GM defect rate, 
      placement within the composite isolation wall, and contact level with 
      soil-bentonite on contaminant transport behavior are further studied. The results 
      show that as the average frequency of GM defects increases from 2.5 to 50 holes 
      per hectare, the breakthrough time of organic contaminants through composite 
      barrier decreases by almost 70%. Poor contact level between GM and soil-bentonite 
      mixture may reduce the breakthrough time of the composite cut-off wall by 65%. 
      Although the selection of GM placement has limited impact on the transient flux 
      of contaminants, it does affect the total flux of contaminants over a certain 
      period of time. The effects of permeability coefficient, effective diffusion 
      coefficient, distribution coefficient, and hydraulic head of the composite 
      cut-off wall can be considered by the proposed analytical solution, which would 
      provide guidance and reference for the design and service performance evaluation 
      of the composite cut-off wall.
FAU - Lin, Hai
AU  - Lin H
AUID- ORCID: 0000-0002-3498-8059
AD  - School of Infrastructure Engineering, Nanchang University, Nanchang 330031, 
      China.
FAU - Huang, Wenzhou
AU  - Huang W
AD  - School of Infrastructure Engineering, Nanchang University, Nanchang 330031, 
      China.
FAU - Wang, Liangni
AU  - Wang L
AD  - School of Infrastructure Engineering, Nanchang University, Nanchang 330031, 
      China.
FAU - Liu, Zhanlei
AU  - Liu Z
AD  - Key Laboratory of Ministry of Education for Geomechanics and Embankment 
      Engineering, Hohai University, Nanjing 210024, China.
LA  - eng
GR  - 42062018/National Natural Science Foundation of China/
PT  - Journal Article
DEP - 20230713
PL  - Switzerland
TA  - Polymers (Basel)
JT  - Polymers
JID - 101545357
PMC - PMC10385536
OTO - NOTNLM
OT  - analytical solution
OT  - defect of geomembrane
OT  - organic contaminants
OT  - the migration behavior of contaminants
OT  - vertical cut-off wall
COIS- The authors declare no conflict of interest.
EDAT- 2023/07/29 11:43
MHDA- 2023/07/29 11:44
PMCR- 2023/07/13
CRDT- 2023/07/29 01:41
PHST- 2023/06/07 00:00 [received]
PHST- 2023/07/06 00:00 [revised]
PHST- 2023/07/11 00:00 [accepted]
PHST- 2023/07/29 11:44 [medline]
PHST- 2023/07/29 11:43 [pubmed]
PHST- 2023/07/29 01:41 [entrez]
PHST- 2023/07/13 00:00 [pmc-release]
AID - polym15143031 [pii]
AID - polymers-15-03031 [pii]
AID - 10.3390/polym15143031 [doi]
PST - epublish
SO  - Polymers (Basel). 2023 Jul 13;15(14):3031. doi: 10.3390/polym15143031.