Experimental Evaluation of Indoor Formaldehyde Decomposition Performance of Atmospheric Plasma Reactor Utilizing Sensor Network

Abstract

An experimental investigation is conducted into the indoor formaldehyde decomposition performance of an atmospheric plasma reactor with an airflow rate of 200 L/s, discharge power of 50 W, and operating voltage of 8.5 kV, utilizing a sensor network. It is shown that, given an initial formaldehyde concentration of ∼0.2 ppm, the reactor removes 15∼80% of the formaldehyde at a height of 107 cm and 20∼73% at a height of 180 cm after 5.5 hours. Moreover, it is shown that, in decomposing the formaldehyde, the reaction process does not generate O 3 . Finally, it is shown that the reduction in the formaldehyde concentration is particularly significant near the outlet of the plasma reactor and between the reactor and the door.

Preparation of Lignocellulose-Based Activated Carbon Paper as a Manganese Dioxide Carrier for Adsorption and in-situ Catalytic Degradation of Formaldehyde

“…Catalytic oxidation has been proved to be a useful method for degrading formaldehyde. It mainly includes photocatalytic oxidation (Sun et al, 2010;Dou et al, 2019), plasma technology (Saulich and Müller, 2013;Lo et al, 2015), thermal catalytic oxidation (Liu et al, 2019), and room-temperature catalysis (Wang et al, 2015). However, both photocatalytic oxidation and thermal catalytic oxidation use large-scale equipment, such as a heating unit and a light source.…”

Using Box Modeling to Determine Photodegradation Coefficients Describing the Removal of Gaseous Formaldehyde from Indoor Air

“…Because of the initial rapid adsorption of HCHO onto the TiO 2 photoreactor, the gaseous HCHO concentration jumps to the fixed value and the kinetic reaction is presumed as a first-order reaction (Langmuir isotherm). However, the results of data driven observation in most studies present an approximate zero-order reaction except for low concentration of HCHO (Lo et al, 2015;Yu et al, 2015). We suggest that the measurement uncertainties of rate-dependency are trade-off the accuracies of processing contributions in quantitation.…”

“…Therefore, the aerosol term of HCHO is emphasized in our model to reflect the effect of water molecules in the photochemical reactions. Based on other studies (Han et al, 2012;Lo et al, 2015;Yu et al, 2015), three air conditions of temperature, relative humidity and wind speed are considered as the principal factors on the removal of gaseous VOCs indoors.…”

Indoor air quality improvement and purification by atmospheric pressure Non-Thermal Plasma (NTP)

“…However in the case of ozone (O 3 ), previous experiments have shown that ozone production is significantly suppressed by VOC presence and weakly generated in ambient air alone at low supply voltage (1-3 kV) without addition of oxygen 11 . Shimizu 29 has shown that ozone production is significantly reduced by 54% in a microplasma DBD reactor operated by a Marx generator compared with a high voltage amplifier for indoor air cleaning, while Lo 19 reported that, using an atmospheric NTP reactor operated at 8.5 kV to decompose nearly 0.2 ppm formaldehyde, the ozone concentration evolved from the reactor was below detection limit (0.01 ppm). Additionally, the experimental results reported by Fan 15 vis-à-vis plasma-assisted ozone evolution mechanism studies indicate that outlet ozone reduces when air humidity increases, owing to the removal of •O by H 2 O to form •OH (Eq.…”