• 상하수도학회지
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• 제30권1호
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• pp.77-85
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• 2016

The characteristics of filter/adsorber granular activated carbon (F/A GAC) were investigated by measuring various parameters, which include surface area, pore volume, abrasion number, floater, and water-soluble ash. The correlation between parameters was also evaluated. Moreover, rapid small-scale column test (RSSCT) was conducted for adsorption characteristics. Thirteen F/A GAC were tested, and the average values of abrasion number and water-soluble ash were 88.9 and 0.15%, respectively. F/A GAC with the larger external surface area and greater mesopore volume had the lower abrasion number, which indicated that it was worn out relatively easily. Water-soluble ash of coconut-based GAC (about 2.6%) was greater than that of coal-based GAC (less than 1%), and the pH of solution was increased with GAC, which had the higher water-soluble ash. On the other hand, floater of thirteen F/A GAC was divided as two groups, which one group had relatively higher floater (2.7~3.5%) and the other group had lower floater (approximately 0.5%). The results of RSSCT indicated that coconut-based GAC (i.e. relatively higher water-soluble ash) had less adsorption capacity. Moreover, adsorption capacity of coal-based GAC with larger surface area and greater mesopore volume was superior to others.

• 한국산학기술학회논문지
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• 제20권6호
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• pp.587-591
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• 2019

미세먼지는 대기를 타고 호흡기를 거쳐 폐 혹은 혈관에 침투 한다. 최근 미세먼지 문제 때문에 국내에 공기청정기 수요도 급증하고 있다. 이끼는 가장 오래된 지상식물로 중금속과 미세먼지를 흡착하여 분해하는 성질을 가지고 있는 것으로 알려졌고 본 연구진은 이를 활용하여 화학적 필터를 대체 할 수 있는 시스템에 대해 연구하였다. 이끼와 기존 화학적 필터(Hepa)의 미세먼지 감소 효과를 비교하기 위하여 $1m^3$의 큐브를 제작하고 통제된 환경하에서 미세먼지의 감소량을 비교하였다. 미세먼지 상황 하에서 이끼, 헤파, 무필터를 탑재한 공기정화 시스템을 각 30회씩 총 90회 가동 하였고 각각의 미세먼지 감소량 및 감소율을 비교한 결과 감소량은 미세먼지 이끼필터를 사용한 평균이 138.93으로 헤파필터를 사용한 평균 76.57과 무필터 상태의 평균인 0.10보다 유의하게 높았으며 감소율의 평균 역시 이끼필터를 사용한 경우 0.2379로 헤파필터를 사용한 경우의 0.1298이나 무필터인 0.0063보다 유의하게 높았다. 이 결과를 통해 이끼의 미세먼지 감소효과를 확인하였고 향후 개선을 통해 기존 공기정화기의 화학필터를 대체하거나 보조할 것으로 기대된다.

• 펄프종이기술
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• 제38권3호
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• pp.23-28
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• 2006

Xylan in hemicellulose has been reported as one of the reasons of the yellowing of chemical pulp and paper. But little relevant information is available in literature. In this study, we examined into the influence that glucuronoxylan or glucomannan and metallic ion($Cu^{2+},\;Fe^{2+},\;Fe^{3+},\;Mn^{2+}$) residued in pulp get each or when mixed at yellowing. Filter paper was treated with each metallic ion, glucuronoxylan and the mixture of glucuronoxylan and metal ions, and brightness and CIE $L^*a^*b^*$ was measured after accelerated aging. As the results of measurements, the filter paper processed by 10% glucuronoxylan was dropped $2{\sim}3%$ on the brightness after accelerated aging for 24 hours. Also, the filter paper treated with glucuronoxylan and $Fe^{2+}$ was dropped 7% on the brightness.

• 한국표면공학회지
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• 제29권1호
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• pp.45-59
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• 1996

Ultrafine powders(UFPs) of aluminum nitride(AlN) have been synthesized by chemical reactions in the nitrogen atmosphere and the gaseous aluminum evaporated from Al powders in thermal plasmas produced by a DC plasma torch. A synthesis system consisting of a plasma torch, a finely-controllable powder feeder, a reaction chamber, and a quenching-collection chamber have been designed and manufactured, and a filter for gathering AlN UFPs produced by the quenching process subsequent to the synthesis is set up. The synthesis process is interpreted by numerical analyses of the plasma-particle interaction and the chemical equilibrium state, respectively, and a fully-saturated fractional factorial test is used to find the optimum process conditions. The degrees and ultrafineness of synthesis are evaluated by means of SEM, TEM, XRD, and ESCA analyses. AlN UFPs synthesized in the optimum process conditions have polygonal shapes of the size of 5-100 nm, and their purities differ depending on collecting positions and filter types, and the maximum purity obtained is 72 wt% at the filter.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.2
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• pp.361-364
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• 2006

Generally, aging of paper is evaluated by folding endurance and degree of yellowing. It was known as that lignin, hemicellulose and metallic ion affect yellowing of mechanical or chemical pulps. Among these elements, especially, the study of hemicellulose that affect at yellowing of pulp is insufficient. In this study, we examined into the influence that glucuronoxylan or glucomannan and metallic ion($Cu^{2+},\;Fe^{2+},\;Fe^{3+},Mn^{2+}$) residued in pulp get each or when mixed at yellowing. Filter paper was treated with each metallic ion, glucuronoxylan and the mixture of glucuronoxylan and metal ions, and brightness and CIE $L^*a^*b^*$ was measured after accelerated aging. As the results of measurements, the filter paper processed by 10% glucuronoxylan was dropped 2-3% on the brightness after accelerated aging for 24 hours. Also, the filter paper treated with glucuronoxylan and $Fe^{2+}$ was dropped 7% on the brightness.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.317-318
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• 2005

• 에너지공학
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• 제7권1호
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• pp.103-112
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• 1998

산업용 직물여과포의 운전에서 발견되는 다양한 문제점들을 해결하기 위한 일환으로 내열성여과포를 개발하여 성능을 규명하였다. 국내 산업체에서 배출되는 대표적인 네 종류의 먼지들, 즉 제철공정의 코크먼지, 시멘트 제조업체의 시멘트 먼지, 유동층 연소로의 비산회재, 그리고 폐플라스틱 소각로의 연소재에 대하여 여과포의 성능을 시험하였다. 내열성여과포의 물리화학적 특성은 평균 세공흐름압력 및 기포점 세공지름, 평균흐름 세공지름, 세공크기분포, SO2 및 NO2 분위기에서의 물성변화의 항목으로 평가 되었다. 또한, 벤치규모의 필터시험장치에서 직물여과포에 대한 압력손실, 먼지 통과율, 여과포 성능 평가지수를 조사하였다. 본 연구에서 개발된 직물여과포는 양호한 물리화학적 필터 특성을 지니고 있으며 전형적인 산업체 먼지를 처리하는데 적합하였다.

• Korean Chemical Engineering Research
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• 제56권3호
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• pp.356-360
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• 2018

인구증가와 개발 도상 국가의 산업 활동 증가로 인해 대기 중 미세먼지농도가 상승함에 따라 생태계에 미치는 영향이 심각해지고 있다. 그로인해 미세먼지발생을 줄이기 위한 정책을 수립하여 시행하거나 미세먼지를 여과해주는 공기청정기나 마스크의 연구가 활발히 이루어지고 있다. 본 연구에서는 전기방사실험을 통해 셀룰로스 아세테이트 파이버 필터를 제조하고 고분자용액에 활성탄을 첨가하여 미세입자 제거에 미치는 활성탄의 영향을 평가하였다. 미세입자 생성을 위해 염화나트륨 수용액을 사용하였으며, 공기 중 수분의 영향을 배제하기 위해 건조기를 설치하여 수분을 제거한 후 필터 성능을 분석하였다. 활성탄이 첨가될수록 미세입자 제거 효율은 증가하였으며, 아세톤 흡착량 또한 증가하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 춘계학술대회 논문집 반도체재료
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• pp.34-37
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• 2001

As the integrated circuit device shrinks to smaller dimensions, chemical mechanical polishing (CMP) process was required for the global planarization of inter-metal dielectric (IMD) layer with free-defect. However, as the inter-metal dielectrics (IMD) layer gets thinner, micro-scratches are becoming as major defects. Micro-scratches are generated by agglomerated slurry, solidified and attached slurry in pipe line of slurry supply system. To prevent agglomerated slurry particle from inflow, we installed 0.5${\mu}m$ POU (point of use) filter, which is depth-type filter and has 80% filtering efficiency for the $1.0{\mu}m$ size particle. In this paper, we studied the relationship between defect generation and pad count to understand the exact efficiency of the slurry filtration, and to find out the appropriate pad usage. Our preliminary results showed that it is impossible to prevent defect-causing particles perfectly through the depth-type filter. Thus, we suggest that it is necessary to optimize the flow rate of slurry to overcome depth type filters weak-point, and to install the high spray of de-ionized Water (DIW) with high pressure.

• 한국연초학회지
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• 제19권2호
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• pp.129-135
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• 1997

This study was carried out to investigate the influence of triacetin(TA) on some phisico-chemical properties of cigarette filter rods. To find the effect of TA on physical properties, we made six kinds of filters varying the TA levels(0%, 2%, 4%, 6%, 8%, 10%) and measured the hardness, resilience and roundness. The hardness of filter rods was increased from 83.2% to 94.6% with increasing the TA level hut the roundness was not affected by TA levels. After manufacturing the cigarette with the filters, we have analysed the delivery amount of phenol and TA with the content of TA. The amount of phenol was decreased from 20.6$\mu\textrm{g}$/cig. to 12.0 $\mu\textrm{g}$/cig. with increasing the TA level of the filters. The decreasing of phenol amount was thought to be caused by solution effect. Also the TA delivery of TPM was increased from 0% to 5% of TPM with increasing the amount of TA. We have found the interesting phenomena that ventilation rate was also decreasing up to 6oye with increasing TA. It seemed to be due to the encapsulated pressure drop and the reduction of the plugwrap porosity which also caused by the smear with TA on the surface of plugwrap. From this results, we could find that not only the hardness, resilience and ventilation rate but also the contents of phenol and TA in cigarette smoke was affected by the TA levels on the cigarette filter rods.