Institute;
of;
Engineering;
Thermophysics,;
Chongqing;
University,;
Chongqing;
400044,;
China;
Institute;
of;
Engineering;
Thermophysics,;
Chongqing;
University,;
Chongqing;
400044,;
China;
Institute;
of;
Engineering;
Thermophysics,;
Chongqing;
University,;
Chongqing;
400044,;
China;
trickling; biofilter,; purification; of; low; concentration; VOC; waste; gas,; capillary; tube; model.;