• Journal of environmental and Sanitary engineering
• /
• v.19 no.2
• /
• pp.7-14
• /
• 2004

This paper was investigated to clarify the possibility of ammonia-gas removal by essential oil. First of all, the chemical analysis was performed to analyze the composition of an essential oil by GC-MS. The monoterpenes in an essential oil react with ammonia by neutralization and their reaction mechanism was elucidated. Based on their chemical neutralized reaction, the removal efficiencies of ammonia gas were studied to derive the optimal conditions in the scrubber tower such as optimal temperature and pH. The experimental result shows that the removal efficiency of ammonia gas was achieved over 80 % by the misty aerosol dispersion of scrubber tower.

• Bulletin of the Korean Chemical Society
• /
• v.29 no.4
• /
• pp.782-784
• /
• 2008

Ag/Ni bimetallic cluster loading on porous carbon fibers was accomplished in order to enhance the HCl removal efficiency of the carbons. The surface properties of the Ag/Ni/carbons were determined by XRD and SEM. N2/77 K adsorption isotherms were investigated using BET and Boers t-plot methods. The HCl removal efficiency was confirmed by a gas chromatography technique, and it was found that that efficiency was predominantly improved in the presence of Ag/Ni clusters compared with the efficiencies of the as-received and single-metal-plated carbons. This indicates that synergetic reactions exist between Ag/Ni and HCl gas, resulting in advanced HCl removal capacity of porous carbons.

• Journal of environmental and Sanitary engineering
• /
• v.14 no.1
• /
• pp.24-30
• /
• 1999

A biological filter for treatment of toluene among volatile organic compounds was studied. The investigation was conducted using specially built stainless steel columns packed with granular activated carbon and cold for removal of toluene. The G.A. and mold as filter material was also coated with Pseudomonas putida microorganisms.The biofilter unit was operated in the condition of moisture content vairation at gas loading rate of 12.5 l/min. Gaseous toluene taken from tedlar bag was analyzed by the use of G.C equipped with F.I.d detector. The removal efficiency of gaseous toluene was 95% at average inlet concentration of 950 ppm during bio-degradation operating condition. Effective removal efficiency was obtained with moisture content 27.5% at activated carbon and 32% at mold in this study. The effective operating condition were obtained with pH 6-8, temperature 28-42℃ for microbial degradation at gas loading rate of 12.5 l/min in packed material.

• Particle and aerosol research
• /
• v.12 no.4
• /
• pp.135-143
• /
• 2016

Removal of water contents in a gas is needed in industrial field of gas processing related on energy production/conversion, and environmental treatment. Inertial separators are economic devices for separating droplets from the gas stream. For accurate understanding of removal process in a curved vane mist eliminator, a numerical model including turbulent dispersion, evaporation and condensation of water vapor at surface of droplets is required. A two-stage curved vane mist eliminator has been modeled, and fluid flow of mixture of air and water vapor and droplet trajectories were solved simultaneously with taking into account two-way coupling. Removal efficiency of droplets with various inlet condition of relative humidities (RH, 40%, 90%, and 100%) were compared. As RH increased, the effect of evaporation decreased and inertial separation efficiencies of droplets obtained increased especially for droplets of diameter below 10 micrometers.

• Journal of Korean Society for Atmospheric Environment
• /
• v.14 no.E
• /
• pp.1-7
• /
• 1998

This paper presents an experimental study for understanding the indoor air quality in a room. A model room, which had a ceiling-mounted supply and a sidewall-mounted exhaust, was used to examine the effect of air exchange rate (AER) and contaminant source location (CSL) as a function of the elapsed time. A tracer gas method, using carbon monoxide tracer, gas analyzers, and a data acquisition system, was applied to study the ventilation air distribution and the tracer removal efficiency, so-called pollutant removal efficiency, in the model room. The experiment was composed of two parts; firstly the AER was varied to examine its effect on the ventilation air distribution and the ventilation effectiveness and secondly both AER and CSL were considered to determine their effect on the pollutant removal efficiency. It was found that the ventilation effectiveness in the model was proportional to AER but not linearly. It was also found that changing the CSL can improve the pollutant removal efficiency. In some cases, the efficiency improvement by increasing AER was achieved by simply changing CSL.

• Particle and aerosol research
• /
• v.7 no.3
• /
• pp.87-97
• /
• 2011

In this study, we organized the test results obtained from the performance tests for the CA certificated air cleaners which had been commercially available in Korea since 2003, and analyzed the correlation among the test parameters such as flow rate, particle collection efficiency, clean air delivery rate (CADR), ozone emission, odor removal efficiency and noise level etc. The noise level of 267 air cleaners were increased as concentrated at the 45, 50, 55 dB, which are the required noise level for CA certification according to flow rate, and ozone emissions from the CA air cleaners were significantly lower than the requirement limit, 50 ppb for 24 hour operation. The average particle collection efficiency and odor removal efficiency were 89.3 and 80.8%, approximately 20% higher than the requirement of CA certification, regardless of flow rates. The particle removal performance of an air cleaner was clearly discriminated by its CADR, and the CADR was obtained with a simple calculation: 0.79 x flow rate. The low differentiation of gas removal performance of air cleaners by the current CA gas test method was improved by 3.2, 751.3, 13.4 times for ammonia, acetic acid, respectively, by adopting the CADR concept and the real time measurement method, FTIR, for gas removal performance test.

• The Korean Journal of Ceramics
• /
• v.5 no.3
• /
• pp.284-287
• /
• 1999

CuO catalyst-coated alumino-silicate fiber filters were prepared for the simultaneous removal of particulate matter and gaseous contaminants such as NOx and SOx. Hot gas cleaning experiments similar to Shell UOP process other than the catalyst supporting materials were carried out between 300 and $500^{\circ}C$ for the evaluation of the gas removal efficiency of the catalytic filter. Experimental results showed that removel efficiency for $SO_2$ was greater than 99% in the temperature range 450~$500^{\circ}C$ and more than 90% of NO was collected between 350 and $370^{\circ}C$. It was found that the higher the CuO content, the higher the removal efficiency for $SO_2$. Removal efficiency for NO was more affected by the gas cleaning temperature than by the CuO content in the catalyst-filter.

• Proceedings of the SAREK Conference
• /
• 2007.11a
• /
• pp.488-492
• /
• 2007

In this study, experiment was done to verify the relationship between sprayed water's pH and gas removal efficiency of the Air Washer system. The experiment was done with sprayed water's pH in between pH 4.7 to 7.7, and Ion Chromatography analysis was used to identify the system's gas removal efficiency. As a result, $NH_3$ is removal efficiency decreased under 50% above pH 7, and $SO_X$ and $NO_X$ removal efficiency decreased under pH 6. Through this research, the optimum pH operating condition of the Air Washer System was conformed to be in range between pH6 to pH6.5.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2012.07a
• /
• pp.243-246
• /
• 2012

A new multi inner stage(MIS) cyclone was designed to remove the acidic gas and minute particles of harmful materials produced from electronic industry. To characterize gas flow in MIS cyclone, pressure and velocity distribution were calculated by means of computational fluid dynamics(CFD) commercial program. Also, the flow locus of particles and particle removal efficiency were analyzed by Lagrangian method. When outlet pressure condition was -1,000 Pa, the efficiency was the best in this study. Based on the CFD simulation result, the pressure loss and destruction removal efficiency was measured through MIS cyclone experiment.

• 한국생물공학회:학술대회논문집
• /
• 2005.04a
• /
• pp.247-251
• /
• 2005

This research was performed for developing of biological treatment process of odor gas such as MEK, $H_{2}S$, and toluene, which is generated from the food waste recycling process. To establish the operational conditions of odor gas removal by small-scale biofiltration equipment, it was continuously operated by using toluene as a treating odor object. When the odor treating microorganisms were adhered to fibril form biofilter, high removal efficiency over 93% was obtained by biofilm formation. At 400 ppm of inlet odor gas concentration and 10 sec of retention time, the removal efficiency was 76% and 93% in 1st stage reactor and 2nd stage reactor, respectively. However, the removal efficiency remained over 97% at the operational conditions above 15 sec of retention time.