註釋 Individual compound vs. multi-VOC mixture tests on selected groups of compounds (aromatics, alkanes, aldehydes and a complex mixture of 15 or 16 VOCs) were conducted for a honeycomb UV-PCO reactor in a full-scale chamber and for an annular tube reactor in small-scale and mid-scale chambers. Results indicate that the multi-VOC interference effects became more pronounced as the number of VOC species or the total concentration of VOCs increased (e.g., in 16-VOC mixture test) and the UV-intensity decreased (i.e., from 14.35 mW/cm 2 to 1 mW/cm2 for annular tube reactor). A computer simulation model and a "model-based" design procedure were developed for UV-PCO devices. The model consists of a one-dimensional fluid and concentration field model, a VOC reaction kinetics sub-model and a UV-irradiation sub-model. The intrinsic rate models and coefficients obtained from literatures or from independent kinetic experiments are needed as model inputs. The parametric and trend analysis was conducted to investigate the interference effects of other VOCs on toluene removal observed in full-scale experiments. The model developed is useful for investigating the multi-VOC interference effects (surface competition, byproduct generation, etc.) on the effectiveness of UV-PCO devices under various design and operating conditions. 