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JACA (Japan Air Cleaning Association)

The Abstracts of the paper carried by the Journal of JACA

vol.56-4(2018/11/30)

Dust collection and deodorization using the deodorization machine for smoking rooms

In recent years, social interest about the passive smoking has increased.  Because of this situation the development of a technique and the device to prevent passive smoking is carried out positively.  We developed a high-performance plasma deodorization machine that is able to remove a chemical found in tobacco with high removal efficiency.  This machine has been commercialized and used in various places such as waiting rooms in airports, shopping malls, department stores and offices.  In this report, we introduce an example of a dust-collection and deodorization with the high-performance deodorization device.

Air conditioning system for the sports facility

Air conditioning systems for large space as a gymnasium is generally poor energy efficiency in summer, that is, the cooling energy is wasted for the upper space where there are no persons.  A cold draft from a wall or windows of the space cools our feet and makes us uncomfortable in winter.  To solve the issue, we have developed a new air conditioning system which presents a down-flow uniformly using a looped duct installed in a perimeter zone of the space.  The system proved to be no impact to a badminton competition affected by air current.  Additionally, it formed the thermal stratification to provide effective air conditioning in summer and gave a warm air to prevent the cold draft into the gymnasium in winter.

Air purification technology of temporary evacuation facility for nuclear disaster

Since the Fukushima Daiichi Nuclear Power Plant accident, “a system that protects humans from atmospheric radioactive materials” has attracted attention.  This system monitors the air dose rate with a radiation monitor, catches the flying of the radioactive plume, gives a warning, and activates the ventilator.  This filtering system began to be delivered to disaster countermeasures facilities and evacuation facilities around nuclear power plants.  In this paper, we describe the HEPA filter for capturing radioactive aerosol, TEDA impregnated activated carbon adsorbing radioactive iodine gas and radioactive iodide methyl gas used in the system.  In addition, we will also introduce techniques to pressurize the interior of the protected area with filtered air and prevent intrusion of radioactive materials.

Air contaminant control systems for space craft

The ISS (International Space Station) has four types of adsorption columns, the two are packed on zeolite and others are activated carbons (AC).  The heating and vacuuming regeneration systems are applied on the zeolite columns and BMP (RS-TCCS system) AC column.  Non-regeneration type phosphoric acid impregnated AC is used on US-TCCS system.  SMAC nominate around 250 contaminants in space craft.  NASA and JAXA will be improved these adsorption systems to heatless-regeneration and less recharging adsorbents.  Some of ACs with different pore-size distribution were made experimentally and discussed to apply long-duration voyage.

Development of determination method of aldehydes in human breath sample using solid-phase micro extraction gas chromatography-mass spectrometry

Authors have studied the analysis of volatile organic compounds (VOCs) present in the indoor air using the SPME-GC/MS method.  This method is generally applied to analyze the exhaled breath containing aldehydes, which can be used as a cancer biomarker.  In this study, the SPME-GC/MS method was used to establish an optimization method for 11 targeted aldehydes.  The limit of quantitation (LOQ) of this method was found to be 3.58-29.3 ng/50mL, and the relative standard deviation was 0.38-9.68%.  The effect of humidity on the air sample was tested using a test gas with 95% humidity.  Out of these 11 targeted aldehydes, benzaldehyde exhibited a negative humidity effect (-22%), whereas other aldehyde were not affected.  In addition, the recovery rate of the exhaled breath sample was in the range of 73.4-97.2%, wherein that of benzaldehyde was as low as 73.4%, while other aldehyde showed a recovery rate 80% or more. Furthermore, when the exhaled breath sample was stored in a polyvinylidene fluoride bag, it showed a storage stability of more than 90% for 6 h and 80% or more when stored 24 h.