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조병하,이상렵,이순탁,함능수,나인엽,오창언,김자홍 경북대학교 1971 生産技術 Vol.5 No.-
This study is a "reconnaissance" of "preliminary" grade survery with the objectives of compiling and analyzing drainage systems, river pollution, hydraulic and hydrologic characteristics of sewage, and conservation of public water supplies for design of sewer systems in Taegu. In addition, it contains basis information for design of new sanitary sewage and drainage systems for Taegu. The results are shown as follows;1) Before attempting to design a sewage system, it was necessary to set up reliable standards for estinating sewage amounts. 2) The results of analysis and examination of Taegu's drainage systems. 3) The investigation of "sewage quality and river pollution in Taegu. 4) In order to maintain the B.O.D. value of the Kumho River below 8 ppm, a sewage treatment plant will be necessary. The basic information necessary in planning a treatment plant is given. This study is a summary of reseach that was conducted jointly by Kyung-Pook National Univ ersity's Insttute of Industrial Sciences and Young-Nam Universty's Institute of Industrial Sciences and Young-Nam University's Department of Civil Engineering. The study was begun on Novemver 4,1969 and completed on November 3,1970. By an agreement between the United States Agency for International Development and the Ministry of Science and Technology of the Republic of Korea, the work was financial out of the MO ST/USAID Trust Fnnd.
Lee, Jae Hyup,Lee, Choon-Ki,Chang, Bong-Soon,Ryu, Hyun-Seung,Seo, Jun-Hyuk,Hong, Kug Sun,Kim, Hwan Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of biomedical materials research. Part A Vol.a77 No.2
<P>To evaluate the possibility of novel CaO-SiO<SUB>2</SUB>-B<SUB>2</SUB>O<SUB>3</SUB> glass-ceramics (CS10B) as a new bone replacement material, we compared the biodegradation and osteoconduction properties of CS10B, hydroxyapatite (HA), and tricalcium phosphate (TCP). Porous CS10B implants were prepared by the polymer sponge method. L5–6 single-level posterolateral spinal fusions were performed on 30 New Zealand white male rabbits. The animals were divided into three groups by implant material: CS10B, HA, and TCP. Radiographs were performed every 2 weeks. All animals were euthanized 12 weeks after surgery. The ratio of the area occupied by the ceramics by final and initial radiographs was calculated using radiomorphometric analysis. Uniaxial tensile strength was determined from seven cases in each group. The ratio of the area occupied by HA (88.7% ± 16.1%) was significantly higher than the others (p < 0.005), and the ratio of the area occupied by CS10B (28.2% ± 9.3%) was significantly lower than those of HA and TCP (37% ± 9.6%, p < 0.05). The mean values of the tensile strengths of the CS10B (182.7 ± 19.9 N) and HA (191.4 ± 33.5 N) were significantly higher (p < 0.05) than that of TCP (141.1 ± 28.2 N). CS10B had a fusion mass tensile strength similar to that of HA. Histological analysis confirmed that CS10B was well incorporated into the fusion mass. These findings suggest that CS10B is a possible bone replacement material. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res, 2006</P>
Lee, Chang-Gu,Alvarez, Pedro J.J.,Nam, Aram,Park, Seong-Jik,Do, Taegu,Choi, Ung-Su,Lee, Sang-Hyup Elsevier 2017 Journal of hazardous materials Vol.325 No.-
<P><B>Abstract</B></P> <P>This study investigates As(V) removal from aqueous solutions using a novel amine-doped acrylic ion exchange fiber. The amine doping reaction was confirmed using FT-IR, and the surface of the fiber was characterized using FEG-SEM. The synthesis process was completed within 60min using an AlCl<SUB>3</SUB>·6H<SUB>2</SUB>O catalyst at 100°C, and the resulting in a fiber with an ion exchange capacity of 7.5meq/g. The removal efficiency of the A-60 fiber was affected by the solution pH, and the efficiency was optimum at pH 3.04. As(V) adsorption on the fiber was rapid in the first 20min and reached equilibrium in 60min. As(V) removal followed pseudo-first-order kinetics, and the Redlich-Peterson adsorption isotherm model provided the best fit of the equilibrium data. The fiber has an As(V) adsorption capacity (<I>q<SUB>e</SUB> </I>) of 205.32±3.57mg/g, which is considerably higher than literature values and commercial adsorbents. The removal efficiency of the fiber was above 83% of the initial value after nine regeneration cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel amine-doped acrylic fiber was suitable for the removal of As(V) from water. </LI> <LI> The amine doping reaction was complete within 60min under catalysis at 100°C. </LI> <LI> The maximum adsorption capacity (<I>q<SUB>e</SUB>)</I> for As(V) was 205.3±3.6mg/g. </LI> <LI> This fiber can be an affordable and reusable ion exchange medium. </LI> </UL> </P>
Removal and Recovery of Cr(VI) from Industrial Plating Wastewater Using Fibrous Anion Exchanger
Lee, Chang-Gu,Park, Jeong-Ann,Choi, Jae-Woo,Ko, Seok-Oh,Lee, Sang-Hyup Springer Netherlands 2016 Water, Air and Soil Pollution Vol.227 No.8
<P>The aim of this study was to investigate the removal and recovery of hexavalent chromium (Cr(VI)) from industrial plating wastewater using anion exchanger Kanecaron SA fibers in batch systems. The surface morphology and physicochemical properties of the fiber were analyzed by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDAX), and Fourier transform infrared spectroscopy (FT-IR). The removal efficiency was affected by the solution pH and showed a plateau formation decreasing on both sides of pH 4. The Cr(VI) uptake on Kanecaron SA fibers was rapidly increased in the first 10 min, and the kinetic data fit well to the Elovich model. Isotherm model analysis demonstrates that the Redlich-Peterson model suitably describes the equilibrium data, and the maximum adsorption capacity (Q(m)) from the Langmuir model was 87.366 mg/g for Cr(VI) in distilled water, 117.977 mg/g for total Cr, and 57.101 mg/g for Cr(VI) in wastewater. Additionally, the Cr(III) contained in the plating wastewater was removed by the Kanecaron SA fibers, while the other heavy metals were not removed. Thermodynamic analysis indicates that Cr(VI) adsorption to Kanecaron SA fibers decreased with increasing temperature from 10 to 50 degrees C, indicating the spontaneous and exothermic nature of the sorption process. The removal efficiency was maintained above 80 % during four regeneration cycles.</P>
Phosphorous recovery from sewage sludge using calcium silicate hydrates
Lee, Chang-Gu,Alvarez, Pedro J.J.,Kim, Hee-Gon,Jeong, Seongpil,Lee, Seunghak,Lee, Ki Bong,Lee, Sang-Hyup,Choi, Jae-Woo Elsevier 2018 CHEMOSPHERE - Vol.193 No.-
<P><B>Abstract</B></P> <P>Phosphorous is an essential limiting nutrient for which there is no substitute. Its efficient recovery from sewage treatment plants is important to mitigate both dependence on limited reserves of exploitable phosphate rock and eutrophication of surface waters. Here, we evaluate the use of calcium silicate hydrates (CSH) to recover phosphorous eluted from sewage sludge. Phosphorous elution experiments were conducted with acid and base leaching solutions. The phosphorous recovery efficiency with CSH was compared to that with other calcium compounds, and the final product was analyzed to assess its potential value as fertilizer. Dried sewage sludge from the West Lake Ecological Water Resource Center, South Korea, having 123 g-P kg<SUP>−1</SUP>, was used for these tests. About 55% of the phosphorus in the sludge was released with an elution solution of 0.1 M H<SUB>2</SUB>SO<SUB>4</SUB>. A dose of 15 g L<SUP>−1</SUP> of CSH recovered 89.6% of the eluted phosphorous without the need for additional pre-treatment, and the resulting calcium phosphate product (in brushite form, based on XRD analysis) exhibited superior settleability than that resulting from Ca(OH)<SUB>2</SUB>- and CaCl<SUB>2</SUB>-induced precipitation. XRD peaks of the calcium sulfate hydrate (in gypsum form) and residual CSH were also observed. The final product contained a relatively high content of the total P<SUB>2</SUB>O<SUB>5</SUB> eluted in a 2% citric acid solution (43.1%), which suggests that it might be readily used to fertilize crops.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Phosphorous eluted from sewage sludge can be effectively recovered by CSH. </LI> <LI> 55% of the phosphorus in the sludge (123 g-P/kg) was released into 0.1 M H<SUB>2</SUB>SO<SUB>4</SUB>. </LI> <LI> 15 g/L of CSH recovered 89.6% of the eluted phosphorus without further treatment. </LI> <LI> The resulting calcium phosphate product from CSH exhibited superior settleability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Increase of Available Phosphorus by Fly-Ash Application in Paddy Soils
Lee, Chang Hoon,Lee, Hyup,Lee, Yong Bok,Chang, Hong Hee,Ali, Muhamad Aslam,Min, Wonki,Kim, Suk,Kim, Pil Joo M.Dekker 2007 Communications in soil science and plant analysis Vol.38 No.11-12
<P> Fly ash from the coal-burning industry may be a potential inorganic soil amendment to increase rice productivity and to restore the soil nutrient balance in paddy soil. In this study, fly ash was applied at rates of 0, 40, 80, and 120 Mg ha-1 in two paddy soils (silt loam in Yehari and loamy sand in Daegok). During rice cultivation, available phosphorus (P) increased significantly with fly ash application, as there was high content of P (786 mg kg-1) in the applied fly ash. In addition, high content of silicon (Si) and high pH of fly ash contributed to increased available-P content by ion competition between phosphate and silicate and by neutralization of soil acidity, respectively. With fly-ash application, water-soluble P (W-P) content increased significantly together with increasing aluminum-bound P (Al-P) and calcium-bound P (Ca-P) fractions. By contrast, iron-bound P (Fe-P) decreased significantly because of reduction of iron under the flooded paddy soil during rice cultivation. The present experiment indicated that addition of fly ash had a positive benefit on increasing the P availability.</P>