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Transport properties of sorbing contaminants in a fractured granite under oxidizing conditions
박정균,한필수,조원진 한국화학공학회 2006 Korean Journal of Chemical Engineering Vol.23 No.5
to understand the transport behavior of contaminants at underground environments. For the tracers, tritium and anionswere used as nonsorbing ones and some sorbing cations such as Sr, Co and Cs were used as well. The experimentalstudy was focused on the identification of the retardation and matrix diffusion of the tracer in the fracture. The hydraulicconductivity in the fracture was determined from the pressure diferentials between pairs of boreholes. The hydraulicdata were used with a variable aperture channel model to characterize the aperture distribution in the fracture. A transportmodel has been developed to describe the migration of the solutes in the flow field by using a particle tracking method.have been explored with the transport model which takes into account sorption and diffusion into the rock matrix. Thiscomparison may contribute to further understanding on the heterogeneous flow field and the interactions betwen rockand chemical species.
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Diffusion of some chemical species through a granite considering their geochemical properties
박정균,백민훈 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
Through-diffusion experiments for some chemical species onto granite have been carried out to understand their diffusion characteristics according to their geochemical properties. The chemical species used in the experiment were classified into three groups as a nonsorbing tracer, simple cation and multivalent species. The difference in the diffusion process among the nonsorbing tracers was evaluated and discussed in terms of their interactions with the rock’s pore surface. The extent of surface diffusion was examined from the view of sorption reversibility for the sorbing cations. For the multivalent species, two kinds of experiments were performed to study the effects of geochemical conditions in acidic and alkaline solutions. Chemical species and sorption properties were also investigated as a function of the pH and carbonates in order to examine the effects of the carbonates on diffusion in alkaline conditions.
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아파트 조리대의 환기성능 평가를 위한 실내오염도의 시계열적 변화연구
박정균,김경미 경인여자대학 2002 경인논집 Vol.- No.9
Kitchen venting is one of the most important implication in relation to the management of indoor air pollution. Range top burners used for making food are usually the major source of indoor air pollution that affects so significantly the performance of healthy housing. Indoor air pollution increases the heating load of the housing in winter because it should be ventilated more frequently and may limit comfort conditions to long time residents in home; in air conditioned tighten house, apartment it increases the cooling load in summer. As range top burner emits the pollutants to the indoor, a good estimate of exhaust air quantity for healthy home is required for the proper monitoring of carbon dioxide concentration. In this study, time serial monitoring of carbon dioxide is performed continuously each 30 seconds to estimate the exhaustion capacity and flow pattern so as to establish the proper range hood ventilation with consideration of indoor air quality. From the results of this study, following conclusions are summarized. In the case of general using of range top burner and range hood, there exist a high concentration of carbon dioxide(802.93∼2118.54ppm) that exceeds to WHO standards of general indoor spaces 0.1%(1000ppm). But, by attached vinyl curtain around the range hood, carbon dioxide concentration distribution(734.15∼969.02ppm) is decreased significantly 5.79∼54.26% than general using. thus the improvement of range hood and the suggestion of proper usage for kitchen equipment in general indoor spaces is important in relation to the performance of healthy housing.
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