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Performance of biotrickling filters packed with structured or cubic polyurethane sponges for VOC removal
Authors:Chunping Yang  Guanlong Yu  Guangming Zeng  Haining Yang  Fayuan Chen and Congying Jin
Institution:1. College of Environmental Science and Engineering, Hunan University, Hunan 410082, China.;College of Environmental Science and Engneering, Zhejiang Gongshang University, Hangzhou 310012, China
2. College of Environmental Science and Engineering, Hunan University, Hunan 410082, China.;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Hunan 410082, China
3. College of Environmental Science and Engineering, Hunan University, Hunan 410082, China.
Abstract:Two identical bench-scale biotrickling filters (BTFs),BTF 1 and BTF 2,were evaluated for toluene removal at various gas empty bed contact times (EBCTs) and organic loadings.BTF 1 and BTF 2 were packed with structured and cubic synthetic polyurethane sponges,respectively.At a constant toluene loading of 16 g/(m3.hr),toluene removal efficiencies decreased from 98.8% to 64.3% for BTF 1 and from 98.4% to 74.1% for BTF 2 as gas EBCT decreased from 30 to 5 see.When the toluene loading increased from 35 to 140 g/(m3·hr) at a gas EBCT of 30 see,the removal efficiencies decreased from 99.1% to 77.4% for BTF 1 and from 99.0% to 81.5% for BTF 2.The pressure drop for both BTFs increased with increased air flow rate,and did not significantly vary while the toluene loading was increased under similar operation conditions.BTF 1 and BTF 2 could start up successfully within 19 and 27 days,respectively,when packed with fresh sponge media,and the performances could be restored in 3-7 days after biomass was removed and wasted from the media.BTF 2 displayed higher removal efficiency even under shorter EBCT or higher loading rate than BTF1 when other operation conditions were similar,while it showed lower pressure drop than BTF 1 during the whole period of operation.These results demonstrated that both BTFs could treat waste gas containing toluene effectively.
Keywords:biofiltration  biotrickling filter  elimination capacity  empty bed contact time  sponge  volatile organic compound
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