Concentration Degradation Of Bacterial Utilizing Photocatalysis Of TiO₂Accompanied With Ozone

With the continuous progress of society, people are slowly changing patterns of life.Most of the time people are in the room every day, and indoor air quality is good or badwill directly affect people’s daily work and life. Indoor disinfection are increasinglyaffected by attention.Now there are many ways indoor disinfection. In this thesis, thereare two ways ozone with titanium dioxide (TiO2) photocatalyst degradation of indoorbacteria concentrations of disinfection.Using impact method collection of bacteria, the bacteria was collected bacteriasuspended in the air. When collecting bacteria in laboratory air temperature, humidity,atmospheric pressure and wind speed maintained within a certain range. Experimentalprocedure is divided into four steps: First, the determination of the indoor concentrationof bacteria; Secondly, under conditions of open UV LED indoor bacterial degradationexperiments; Thirdly, the conditions in the open photocatalyst indoor bacterialdegradation experiments; Finally, while both open indoor bacterial degradationexperiments. The experimental results obtained using fluent software then explain theprocess to simulate the indoor bacteria, comparing the results with the simulation resultson site.When UV LED and TiO2don’t open, acquisition time25seconds bacterialconcentration (CFU/m3) is24to64; Acquisition time of1minute bacterial concentration(CFU/m3) is37to117; Acquisition time of5minutes the concentration of bacteria(CFU/m3) is from62to131. After only opening UV LED, concentration of bacteriarapidly reduce the former30minutes and becomes stable after60minutes. After onlyopening photocatalyst, concentration of bacteria rapidly reduce the former30minutesand becomes stable after90minutes. At the same time open, concentration of bacteriarapidly reduce the former15minutes and becomes stable after45minutes. TiO2with ozone degradation can be effectively and rapidly indoor concentration of bacteria, thebacteria concentration is maintained at a very low level. simulating indoor bacterialdegradation process, the average degradation rate is96%.