Removal of Polycyclic Aromatic Hydrocarbons from Cooking Fumes Using an Atmospheric Plasma Reactor

• Main Authors: Hung-Chang Chang, 張弘昌
• Other Authors: Lien-Te Hsieh
• Format: Others
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/61387853838915304796

博士 === 國立屏東科技大學 === 環境工程與科學系所 === 101 === Plasma technology is becoming increasingly vital for treating various environmental toxic pollutants. The toxics of polycyclic aromatic hydrocarbon are critical in the field of air toxics. Numerous studies have shown that production from cooking oil fumes (COFs), especially for polycyclic aromatic hydrocarbons (PAHs), has adverse effects on people health. The emission of PAHs is a serious problem because of its mutagenicity and carcinogenicity. This study investigates the decomposition efficiency of PAHs emitted from kitchens using an atmospheric plasma reactor (APR) with different input power wattages, including BP17A (0.112 kJ/m3), BP24A (0.138 kJ/m3), and BP30A (0.156 kJ/m3) with wet scrubbing tower (water/bio-solution (NOE-7F) scrubbing). In addition, we explore the plasma state by using optical emission spectroscopy (OES) and an optical fiber with a spectrometer (HR4000CG) to reveal its changes. Moreover, this study also presents the simulation of an APR by using a method based on computational fluid dynamics (CFD). A commercial CFD tool was used to solve mass, momentum, and energy equations. The commercial ANSYS FLUENT code was then used to simulate the Acpy compound by using a 3D APR to treat the cooking fume exhaust emitted from a restaurant kitchen. An in-house-reduced chemical mechanism was coupled with the CFD code for an improved computational runtime. The reactivity of the system was considered with the RNG k-ε turbulence model and the classic Eddy dissipation concept (EDC) combustion model. The results showed that (a) for Acpy, the removal efficiencies for BP24A and BP30A were 65.2% and 83.8%, respectively. For Acp, the removal efficiencies for BP24A and BP30A were 48.6% and 26.4%, respectively. Similarly, for Ant, the removal efficiencies for BP24A and BP30A were 42.1% and 29.5%, respectively. For BaA, the removal efficiencies for BP24A and BP30A were 53.8% and 33.1%, respectively. For total gaseous PAH concentrations, the removal efficiency was highest for BP30A, followed by BP24A, and then BP17A. (b) Consequent to OES measurement, the occurrence of 300-599 nm, C (492.6, 505.2, 538 nm), C2 (516.4 and 563.3 nm), CH (314.4 nm), CN (359 and 388 nm), Hγ (433.9 nm), N2 (357 and 580.4 nm), N2+ (427.8 nm), NO (237 nm), C+ (386.9 nm), NH (337 nm), O2+ (526 and 545 nm) and 600-900 nm, N2 (646.9 and 891.2 nm）, H2 (601.8 nm), O (846.3 nm), and N (746.8 nm) were observed. (c) The simulation results were compared with the experimental temperature measurement and the removal efficiency of Acpy. The simulated average removal efficiency of Acpy was 61.3%.