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고정층 칼럼에서 폐콘크리트를 이용한 불소 제거 및 동적 흡착 모델 비교 분석
김문주 ( Mun-ju Kim ),박성직 ( Seong-jik Park ) 한국농공학회 2017 한국농공학회 학술대회초록집 Vol.2017 No.-
불소는 음용수에 첨가되며, 치아 우식증을 예방하기 위해 치과 제품에 많이 사용되는데, 1 mg/L 미만의 농도는 치과 질환의 예방에 도움이 되지만 식수에서 1.5 mg/L를 초과하는 불소는 신경학적 손상과 골격/ 치아 불소증을 유발할 수 있다. 폐수에서 불화물을 제거하기 위해서는 막 분리, 전기응집, 전기 화학적 분리, 유동층 반응기, 이온 교환, 응집/침전 및 흡착과 같은 많은 기술이 채택되어 왔다. 이러한 기술 중에서 응집/침전 및 흡착은 가장 널리 사용되고 있다. 응집/침전 공정은 과도한 양의 화학 약품 사용이 필요하고 처분이 어려운 슬러지가 많이 생성되지만, 흡착여과는 저비용, 낮은 에너지 소비, 용이한 조작으로 물 처리에 많이 사용된다. 알루미늄, 칼슘, 철, 탄소 기반의 흡착제, 천연 미네랄, 점토, 생물 흡착제, 산업폐기물 등 불화물의 제거를 위해 다양한 흡착제가 연구되었다. 오래된 건물 및 기타 기반 시설을 철거할 때 콘크리트로 구성된 많은 건축 폐기물이 발생한다. 우리나라의 경우 2008년부터 2013년 까지 182.417 t/day의 건설 폐기물이 발생하였고, 전체 폐기물량 건설 폐기물이 약 60%를 차지하고 있다. 콘크리트에 재활용 골재를 사용하는 것이 환경 및 경제적 관점에서 유리하다. 그러나 작은 입자경 폐콘크리트는 재활용 골재로 사용 시 , 콘크리트의 기계적 강도와 내구성에 악영향을 끼친다. 재활용 과정에서 생성되는 가장 미세 입자는 기계적 안전성이 낮기 때문에 시공에 사용할 수 없으므로, 이 미세 입자를 재사용할 수 있는 다른 방법이 필요하다. 본 연구에서는 연속 유동 조건에서 폐콘크리트 미립자로 채워진 칼럼에서 pH(pH 3-7), 유속(0.3-0.7 mL/min) 및 필터 깊이(10-20 cm)를 조절하여 수용액으로부터의 불화물 제거를 알아보았다. 불소 제거효율은 제거율(Re), 흡착 용량(qe), 사용 흡착도(DoSU) 및 파과 곡선(BTCs)에서 얻은 흡착제 사용률(SUR)을 산정하여 평가하였다. 동적 흡착 모델로 널리 사용되는 Bohs-Adams, Thomas, Yoon-Nelson 모델을 적용하였다. 불소 제거에서의 폐콘크리트 미립자의 성능은 파손 곡선(BTC)에 기초하여 평가되었으며, 앞으로 산업 규모 적용을 위한 모델 설계가 필요하다.
제올라이트의 양이온 교환 용량 및 용액의 화학적 특성에 따른 박테리아의 거동 특성 비교
김문주 ( Mun-ju Kim ),이창희 ( Chang-hee Lee ),유수철 ( Soo-cheul Yoo ),박성직 ( Seong-jik Park ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.5
Bacteria attachment on zeolite with different cation exchange capacity (CEC) was investigated, and zeolite with low CEC (LC-ZL), zeolite with medium CEC (MC-ZL), and zeolite with high CEC (HC-ZL) were used. Column experiments were performed varying column length (10-15 cm), pH (4-8), and ionic strength (0-80 mM). As the increase of the column length, removal percentage was increased but sticking efficiency was not dependent on the column length. The increase of pH decreased both removal percentage and sticking efficiency. Bacteria attachment onto zeolite was increased as the increase of the ionic strength from 0 to 20 mM but it was decreased above 20 mM of the ionic strength. At long (20 cm) or short (10 cm) column length, the differences of removal percentage of LC-ZL, MC-ZL, and HC-ZL were not observed. The bacteria attachment onto MC-ZL and HC-ZL was not significantly different at high ionic strength. Solution chemistry should be considered when the selection of appropriate zeolite for the removal of bacteria.
양이온교환용량이 다른 제올라이트 처리에 따른 밭토양 내 중금속 안정화 평가
구본운,김문주,박성직,Gu, Bon-Wun,Kim, Mun-Ju,Park, Seong-Jik 한국농공학회 2017 한국농공학회논문집 Vol.59 No.5
This study was aimed to investigate the influence of cation exchange capacity (CEC) and application amounts of zeolite on the stabilization of heavy metals (As, Ni, Pb, and Zn) in upland soils. The upland soils were sampled from field near mines located in Gyeonggi Province. The CEC of zeolite was treated at three different levels, ie, low, medium, and high, while zeolite was amended with soils at the ratio of 0.1 % and 0.5 % as to soil weight. A sequential extraction was performed for the soil sampled at 1, 2 4, and 8 week after zeolite was added to the soil. The concentrations of Pb and Zn appeared to be high in the sampled soils. The mobility of heavy metals obtained from sequential experiments was as follows: Pb > Zn > Ni >As. Addition of zeolite to contaminated soils effectively reduced exchangeable and carbonate fractions but increased organic and residual fraction, indicating that zeolite is effective for immobilizing heavy metals in soils. The influence of incubation time on the metal stabilization was rather pronounced as compared to the application amount and CEC of zeolite.
건강관리를 위한 IoT기반 스마트슈즈시스템에 관한 연구
이민주 ( Min-ju Lee ),김문주 ( Mun-ju Kim ),김영현 ( Young-hyun Kim ),하여의 ( Yeo Ui Ha ),이상준 ( Sang-jun Lee ),박진호 ( Jin-ho Park ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1
요즘 전세계적으로 매년 소아비만 빈도가 증가하고 있다. 그리고 소아비만은 더 나아가 성인병의 원인이 될 수 있다. 이런 소아비만과 성인병을 예방하기 위해 스마스슈즈시스템 (SMTS1107)을 개발했다. SMTS1107은 걸음 수 측정기능과 몸무게 측정 기능을 갖고 있다.
Distribution and occurrence of microplastics in fish of the Han River
Tae-Jin Park(박태진),Seunghyun Lee(이승현),Youngsun Lee(이영선),Mun Ju Park(김문주),Ji Hyung Park(박지형) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
We investigated the distribution of microplastic in fish inhabiting in the Han River with 5 species. Sampling sites were deliberately selected, where the degree of pollution from microplasic and habitats of fish were taken into account. According to the sites, the highest abundance was the North Han River (28.2±14.9 particle/fish), followed by the downstream of the Han River (19.9±9.9 particle/fish) and the South Han River (16.8±13.4 particle/fish). According to the species, the highest abundance was carp, followed by Crucian carp, skygager, catfish and sky carp. There is a significant correlation between the abundance and eating habit. Omnivore fish such as Carp and Crucian carp showed the highest abundance and insectivore like skin carp was the least abundance. Micropalstic abundance in fish was positively related to an increasing fish body and weight although the model explained a small portion of the variation in the data. Additionally the abundance in water did not affect the abundance in fish. Polypropylene was the most abundant polymer type, followed by polyethylene and polytetrafluoroethylene in fish. Consequently, this study will make a contribution to better understanding of microplastic exposure to the aquatic life and provide the information to manage and reduce microplastic in freshwater.
열처리된 Attapulgite를 이용한 수중 불소의 흡착 제거 특성
서은진 ( Eun-jin Seo ),김문주 ( Mun-ju Kim ),박성직 ( Seong-jik Park ) 한국수처리학회 2018 한국수처리학회지 Vol.26 No.3
In this study, fluoride removal using attapulgite (ATTP) was investigated and thermal treatment was performed on the ATTP to improve its adsorption capacity of fluoride. Adsorption experiments were performed under batch conditions. Fluoride adsorption capacity of thermally treated attaplugites increased with increasing thermal treatment temperature and showed the highest adsorption capacity at 700°C (ATTP-700). As a result of kinetic experiment and model analysis, fluoride adsorption on ATTP-700 reached equilibrium after 6 hours and adsorption rate was mainly influenced by chemical adsorption. The equilibrium adsorption experiment showed that the maximum fluoride adsorption amount of ATTP-700 was 4.85 mg/g and was more suitable for the Langmuir model than the Freundlich model. Thermodynamic adsorption experiments showed that fluoride adsorption of ATTP-700 was endothermic and non spontaneous. Highest fluoride adsorption was achieved at pH 3. As the increase of ATTP-700 dose, the percentage of fluoride removal increased, but the amount of fluoride removal per unit mass of the adsorbent was reduced. Different molar fraction of phosphate and fluoride showed that phosphate adsorption onto ATTP-700 was more favorable than fluoride adsorption. ATTP-700 is inexpensive but highly effective for the removal of fluoride from water.