폐하수중 합성세제분해균의 분리 및 합성세제 ( ABS ) 분해특성

이홍재,허종수,조주식,한문규,최정호,이춘희 ( Hong Jae Lee,Jong Soo Heo,Ju Sik Cho,Mun Gyu Han,Jeong Ho Choi,Chun Hee Lee ) 한국환경농학회 1993 한국환경농학회지 Vol.12 No.2

A bacterium which degrades efficiently synthetic detergents was isolated from the polluted waters, activated sludge of wastewater treatment plants or polluted soil. This bacterium showed considerably higher growth rate in the agar plate containing 2,000㎍/㎖ of synthetic detergents than any other isolated strains, was identified as a Pseudomonas fluorescens or strains similar to it. The strain was named as a Pseudomonas fluorescens S1. Optimum pH and temperature for the growth of the Pseudomonas fluorescens S1 were pH 7.0 and 30 ℃, respectively. The strain was resistant to streptomycin and gentamycin, but sensitive to kanamycin. The strain was greatly resistant to zinc chloride, lead nitrate and copper sulfate, but unable to grow in the presence of relatively low concentrations of mercury chloride and silver nitrate. This strain utilized benzene, catechol, cyclohexane and xylene as a sole carbon source. The strain was well grown in the medium containing ABS 10,000㎍/㎖. Degradation of ABS was 55% and 60% at 20㎍/㎖ and 100㎍/㎖ of ABS, respectively. Benzene ring was degraded 45% in 100㎍/㎖ of ABS. During the incubation of the strain in the medium containing ABS 100㎍/㎖ and COD 10,000㎍/㎖ for 4 days, degradation of ABS and COD were reduced to 40㎍/㎖ and 3,200㎍/㎖, respectively. Total amino acid content of the Pseudomonas fluorescens S1 grown with 1,000㎍/㎖ of ABS was 115㎎/g cell, whereas its content was decreased in the bacterium grown without synthetic detergent by 9.4%.

육계분과위원회 운영방안 - 계열사와 농가간의 협의점 도출을 위해 발 벗고 나설 것

이홍재,Lee, Hong-Jae 대한양계협회 2009 월간 양계 Vol.41 No.1

양계산업 불황 극복 방안 - 육계산업 불황 극복 방안

이홍재,Lee, Hong-Jae 대한양계협회 2016 월간 양계 Vol.48 No.5

토양중 제지슬러지의 분해 특성 및 중금속 변화

이홍재,정인호,조주식,허종수 ( Hong Jae Lee,In Ho Jeong,Ju Sik Cho,Jong Soo Heo ) 한국환경농학회 1996 한국환경농학회지 Vol.15 No.3

Chemical characteristics of paper sludge, degradation of the sludge in soil and CO₂ generation, and changes of nitrogen and heavy metals in soil treated with the sludge were investigated. The results obtained was summarized as follows: 1. Degradation rate of paper sludge in soil was 19% at room temperature, and 28% at incubation(30℃) temperature after 12-weeks treatment. 2. T-C, T-N and the C/N ratio of the sludge in soil at room temperature were 15.5%, 0.22% and 71 respectively, and 14.5%, 0.24% and 60, respectively, at incubation(30℃) temperature after 12-week treatment. 3. CO₂genaration in soil treated with 1%, 3% and 5% of the sludge was 247㎎/100g, 334㎎/100g and 458㎎/100g, respectively, at room temperature, and 385㎎/100g, 550㎎/100g and 618㎎/100g, respectively, at incubation temperature after 12 weeks treatment. 4. Mineralization ratio of organic nitrogen in soil treated with 1%, 3% and 5% of the sludge was 8.7%, 13.4% and 16.2%, respectively, at incubation(30℃) temperature after 12-weeks treatment. 5. The amounts of DTPA-extractable Cu, Cd, Zn, Pb, and Cr in Soil treated with paper sludge were 0.7∼2.2, 0.1∼0.17, 1.4∼2.8, 1.4∼2.8, and 0∼0.7㎎/㎏, respectively. Mean while, those of HNO₃ extractable Cu, Cd, Zn, Pb, and Cr were 7.9∼10.0, 0.6∼0.9, 17.6∼34.4, 14.7∼18.5, and 5.8∼9.0㎎/㎏, respectively.

고병원성AI가 육계산업에 미치는 영향과 대책

이홍재,Lee, Hong-Jae 대한양계협회 2007 월간 양계 Vol.39 No.10

차세대 이동통신의 허와 실

이홍재,Lee, Hong-Jae 한국정보통신집흥협회 2000 정보화사회 Vol.137 No.-

공단폐수슬러지의 퇴비화과정 중 물질변환

이홍재,조주식,이성태,허종수,Lee, Hong-Jae,Cho, Ju-Sik,Lee, Sung-Tae,Heo, Jong-Su 유기성자원학회 1997 유기물자원화 Vol.5 No.2

공단폐수슬러지를 퇴비화하여 농지이용가능성을 조사하기 위하여 수분조절제로서 톱밥 또는 왕겨를 첨가하여 혼합한 다음 소형퇴비화조에서 퇴비화과정중 온도, pH, 무기성분, 유기물 및 질소의 형태, 지방산, 미생물종 및 개체수 변화 등의 물질변화를 조사하였다. 공단폐수슬러지에 수분조절제로 톱밥 및 왕겨를 첨가하였을 경우 공히 퇴비화과정중 온도 및 $CO_2$발생량은 퇴비화 2일에 최고에 달하여 그후 서서히 감소하여 퇴비화 6일 후에는 실온과 비슷하였다. C/N율은 퇴비화가 진행됨에 따라 약간 증가하는 경향이었다. 그리고 pH는 퇴비화 초기에는 변화가 없었으나 그후 급격히 증가한 다음 서서히 감소하여 퇴비화 후기 pH는 약 8.7~8.8범위였다. 공단폐수슬러지에 수분조절제로 톱밥 및 왕겨를 첨가 하였을 경우 공히 퇴비화과정중 $P_2O_5$, $K_2O$, CaO, MgO 및 Fe함량 약간 증가하였으며 $SO_4$함량은 퇴비화 초기에 비하여 후기에 약 62~67% 증가되었다. 퇴비화과정중 ether추출물질, 수용성 polysaccharides, hemicellulose 및 cellulose는 감소하였고, resins 및 lignin은 큰 변화가 없였으며, 퇴비화과정중 총질소 및 유기태질소는 감소하였나 무기태 질소는 증가하였다. 퇴비화과정중 총지방산은 감소하였으며, 미생물개체수는 수분조절제의 종류, 미생물의 종류 및 퇴비화 기간에 따라 변화가 심하였다. To study the possibility of agricultural utilization of industrial wastewater sludge, the changes of the substances, such as temperature, pH, inorganic and organic matter, the form of nitrogen, fatty acid and the population number of microorganisms during composting periods were investigated. Temperature and $CO_2$ generation were the highest in the second day of composting peroids, and then were gradually fallen. And they were similar to room temperature after the sixth day of composting periods. C/N ratio was a little increased as time went by. pH value was not changed in early composting periods and then pH had been gradually decreased since it was rapidly increased. It was in the range of 8.7~8.8 in late composting periods. The contents of $P_2O_5$, $K_2O$, CaO, MgO and Fe were a little increased and that of ${SO_4}^{2-}$ was increased with 62~67% in late in comparing with early composting periods. The contents of ether extracted materials, water soluble polysaccharides, hemicellulose and cellulose were decreased but that of resins and lignin were not changed during composting periods. The contents of total and organic nitrogen were decreased but that of inorganic nitrogen was increased during composting periods. The population number of microorganism during composting periods was too much changed according to the kinds of bulking agents and microorganisms, and the composting periods.

소결분위기 제어에 의한 Al₂O₃/Fe-Ni 나노복합재료의 제조 및 특성

이홍재,정영근,오승탁,이재성,Lee, Hong-Jae,Jeong, Young-Keun,Oh, Sung-Tag,Lee, Jai-Sung,Sekino, Tohru 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.2

소결 분위기가 금속입자분산 세라믹스기 복합체의 미세 조직 및 물성에 미치는 영향에 대하여 조사하고자 화학적 방법으로 합성한 $Al_2O_3$/Fe-Ni 나노복합분말을 수소 및 아르곤 가스 분위기, 또한 소결온도 등으로 제어하여 열간가압 소결하였다. 수소분위기에서 소결한 복합체는 아르곤분위기의 경우보다 반응상 $FeAl_2O_4$의 형성이 억제되었으며, 증가된 파괴강도 및 인성 값을 나타내었다. 또한, 소결 온도를 낮추었을 경우 기지상 및 금속 분산상의 미세화와 향상된 기계적 성질을 얻을 수 있었다. 소결 조건에 따른 기계적 특성의 변화는 주로 반응상의 형성과 관련된 미세조직 특성에 의존하는 것으로 해석하였다. To investigate an effect of sintering atmosphere on microstructure and properties of metallic particle dispersed ceramic based composites, the powder mixtures of $Al_2O_3$/Fe-Ni, synthesized by chemical solution process, were hot-pressed under different atmospheres such as hydrogen or argon gas and different sintering temperature. Hot-pressed composite in a hydrogen atmosphere exhibited less reaction phase of $FeAl_2O_4$ and enhanced mechanical properties than that in an argon atmosphere. Furthermore, decreasing hot-pressing temperature produced a refinement of ceramic matrix and metallic dispersion particles as well as improvement of mechanical properties. The change of mechanical properties in the composites with different sintering conditions was explained by microstructural characteristics relating to reaction phase formation.

폐하수슬러지 퇴비 시용이 토양의 화학성 및 옥수수의 생육에 미치는 영향

이홍재,조주식,이원규,허종수 ( Hong Jae Lee,Ju Sik Cho,Won Kyu Lee,Jong Su Heo ) 한국환경농학회 1997 한국환경농학회지 Vol.16 No.3

To study the possibility of agricultural utilization of the municipal sewage and the industrial wastewater sludges, the chemical properties of soil, the growth response of corn plant and uptake of inorganic nutrients in plant tissues were investigated by application of the composts made of the sludges to the pots at the rate of 2,000㎏/10a. The contents of organic matter, T-N, P₂O_5 and K in soil were increased by application of the composts. Each heavy metals contents in soil were increased very slightly by application of the composts. The fresh weights of corn plant were increased with 9∼19% and 60∼79% at the plot of compost and NPK+composts in comparing with the plot of NPK, respectively. Uptake of N, P₂O_5, K₂O, CaO and MgO in stem and leaf of corn plant were increased by applications of the composts.

도시 생활하수 슬러지의 퇴비화를 위한 부숙공정지표 설정

이홍재,조주식,최형섭,허종수 ( Hong Jae Lee,Ju Sik Cho,Hyoung Sub Choi,Jong Soo Heo ) 한국환경농학회 1997 한국환경농학회지 Vol.16 No.4

To study the optimum conditions of composing with sewage sludge, the variations of temperature and CO₂ generation amount during composting periods were investigated. The conditions were that sewage sludge added to bulking agents such as sawdust and rice hull were used and differently treated with microorganism seeding or not, initial C/N ratio, air flow rate and initial moisture contents. The results were summarized as follows : Seeding of 5% microorganism was higher temperature than not seeding. And using rice hull as bulking agents, and adjusting 21∼22 of initial C/N ratio, 200㎖/ℓ·min. of air flow rate and 64∼65% of initial moisture contents were higher temperature than any other conditions. Seeding of 5% microorganism was more CO₂generation amount than not seeding. And using saw dust was more CO₂ generation amount than using rice hull as bulking agents. In the case of initial C/N ratio, adjusting 21∼42 was also more CO₂ generation amount than adjusting 12∼14. Judging from the result, it should be considered that the optimum conditions of composting with sewage sludges were seeding of 5% microorganism and adjusting 21∼22 of initial C/N ratio, 200㎖/ℓ·min. of air flow rate and 64∼65% of initial moisture contents.