文献类型：期刊文献

英文题名：Numerical investigation and optimal design of capillary barrier cover with passive gas collection pipes on the performance at limiting landfill gas emissions

作者：Li, Guangyao Liu, Sida Jiao, Weiguo Feng, Song Zhan, Liangtong Chen, Yunmin

第一作者：Li, Guangyao

通信作者：Feng, S[1]

机构：[1]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China;[2]Beijing Univ Technol, Chongqing Res Inst, Chongqing 401151, Peoples R China;[3]Zhejiang Univ, MOE Key Lab Soft Soils & Environm Engn, Hangzhou 310058, Peoples R China;[4]Guizhou Inst Technol, Sch Civil Engn, Guiyang 550003, Peoples R China;[5]Fuzhou Univ, Coll Civil Engn, Fuzhou 350108, Peoples R China

第一机构：Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China

通信机构：corresponding author), Fuzhou Univ, Coll Civil Engn, Fuzhou 350108, Peoples R China.

年份：2024

卷号：927

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20241615918011);Scopus(收录号：2-s2.0-85190120137);WOS:【SCI-EXPANDED(收录号:WOS:001286131400001)】；

基金：The authors acknowledge financial support from the National Nat-ural Science Foundation of China (No. 42107186) , Natural Science Foundation of Beijing (No. 8242001) and Natural Science Foundation of Chongqing (No. CSTB2023NSCQ-MSX0729) .

语种：英文

外文关键词：Capillary barrier cover; Passive gas collection pipe; Numerical simulation; Landfill gas emission mitigation; Optimal design

摘要：Relying solely on soil properties may not fully ensure the performance of capillary barrier covers at limiting landfill gas (LFG) emissions. This study proposed to install passive gas collection pipes in the coarse-grained soil layers of capillary barrier covers to enhance their performance at limiting LFG emissions. First, the LFG generation rate of municipal solid waste and its influencing factors were analyzed based on empirical formulas. This information provided necessary bottom boundary conditions for the analyses of LFG transport through capillary barrier covers with passive gas collection pipes (CBCPPs). Then, numerical simulations were conducted to investigate the LFG transport properties through CBCPPs and reveal relevant influencing factors. Finally, practical suggestions were proposed to optimize the design of CBCPPs. The results indicated that the maximum whole-site LFG generation rate occurred at the end of landfilling operation. The gas collection efficiency (E) of CBCPPs was mainly controlled by the ratio of the intrinsic permeability between the coarse- and fine-grained soil (K2/K1) and the laying spacing between gas collection pipes (D). E increased as K2/K1 increased but decreased as D increased. An empirical expression for estimating E based on K2/K1 and D was proposed. In practice, CBCPPs