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Wipada Dechapanya
Karnika Ratanapongleka
Tiammanee Rattanaweerapan
Nattpong Kampipak
Sirirat Boonthum
Pawena Limpiteeprakan
Sompop Sanongraj
Supatpong Mattaraj


The objective of this research was to investigate the optimal treatment condition; ozone dosage and fan speed of the air purifier, and the removal efficiency of gaseous formaldehyde in the SY105 classroom of Anatomy building, College of Medicine and Public Health. The Central Composite Design (CCD) model was applied for experimental design. Treatment conditions studied include ozone dosage rate (700 mg/hr, 1,100 mg/hr, and 1,500 mg/hr) and air blower speed (1.12, 1.58, and 2.04 m/s). The results showed that at the ozone dosage rate of 1,500 mg/hr and the air blower speed of 2.04 m/s, the highest removal efficiency of gaseous formaldehyde (62.45±2.07%) was obtained. These conditions were also found to be the optimal condition yielding the most effective treatment of gaseous formaldehyde with ozonation using the package Design Expert V. 13.


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