The co-contamination of metals and organic pollutants,such as Pb and methyl tert-butyl ether(MTBE),in groundwater,has become a common and major phenomenon in many con-taminated sites.This study evaluated the feasibility of their simultaneous removal with permeable reactive barrier(PRB)packed with mixed zeolites(clinoptilolite and ZSM-5)using fixed-bed column tests and breakthrough curve modeling.The effect of grain size on the per-meability of PRB and removal efficacy was also assessed by granular and power clinoptilo-lite.The replacement of granular clinoptilolite by powder clinoptilolite largely reduced the breakthrough time but increased the saturation time nearly fourfold.The column adsorp-tion capacity of clinoptilolite powders almost tripled that of clinoptilolite granules(130.6 mg/g versus 45.3 mg/g)due to higher specific surface areas.The minimum thickness and corresponding longevity of PRB were calculated as 7.12 cm and 321.5 min when 5％of gran-ular clinoptilolite was mixed with 5％ZSM-5 and 90％sand as mixed PRB reactive media compared with 10.86 cm and 1230.2 min for the application of powder clinoptilolite.This study is expected to provide theoretical support and guidance for the practical application of mixed adsorbents in PRBs.

Yunhui Zhang;Fei Wang;Benyi Cao;Hailong Yin;Abir Al-Tabbaa

College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Yangtze River Water Environment,Ministry of Education,Tongji University,Shanghai 200092,China;Department of Engineering,University of Cambridge,Cambridge,CB2 1PZ,UK;Institute of Geotechnical Engineering,School of Transportation,Southeast University,Nanjing 210096,China;State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control,Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment of China,Nanjing 210042,China

环境科学学报（英文版）

[1]Yunhui Zhang;Fei Wang;Benyi Cao;Hailong Yin;Abir Al-Tabbaa-.Simultaneous removal of Pb and MTBE by mixed zeolites in fixed-bed column tests)[J].环境科学学报（英文版）,2022(12):41-49

clinoptilolite,clinoptilo,PRBs

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