퇴적물 토양의 영양염류가 호소 수질에 미치는 잠재 요인 분석

정준오,김영우,Jung, Joon-Oh,Kim, Young-Woo 한국환경보건학회 2009 한국환경보건학회지 Vol.35 No.5

The characteristics of Lake Cheonhoji water and sediment were investigated in oder to utilize these as fundamental materials for the management of lake water quality. The hydrographic properties of Lake Cheonhoji which are relatively low chance of nutrients loading from the watershed and a long retention time of lake water, lead to the probability of high lake productivity. It was also observed that lake water showed stratification during summer and complete mixing during fall, even though water depth was relatively shallow. The trophic state was eutrophic to hypertrophic from summer to late fall. The overall properties of the sediment were oligohumic, high ignition loss and high composition of NAIP and Resid.-P, which might serve as potential pollution sources of lake water quality. In laboratory scale experiments, it was observed that leaching potential of nutrients in the sediment was greatly dependant upon water temperature and dissolved oxygen. Finally, water pollution in Lake Cheonhoji was considered to be largely due to the adverse cycle of uncontrollable eutrophication, which resulted in the subsequent occurrence of dead algae and animal plankton, organic sedimentation, reduction of dissolved oxygen and nutrients leaching, which again reinforced the cycle of eutrophication in the lake.

한국과 미국의 공학교육 연구주제의 동향 분석(Ⅰ)

정준오(Joon Oh Jung),최선미(Sun-Mi Choi) 한국공학교육학회 2013 공학교육연구 Vol.16 No.2

In this paper, articles in full body of JEER in Korea and JEE in U.S. were classified into two categories- Research area and Key words-to endeavor a comparative study of the engineering education research(EER) topics and their temporal changes. In the recent 4 year term, ‘Accreditation of Engineering Education’ and ‘Courses & Curriculum’ were the most common key words appearing in JEER and ‘Researches on EER’ and ‘Learner’s Factor’ in JEE. If we put curriculum/teaching materials/teaching as the input elements and learning/assessment as the output elements for education achievement, JEE demonstrates that many of the research topics have shifted from input to output in the recent years, while JEER research is in the transient stage.

공기공급량이 음식폐기물의 퇴비화 반응에 미치는 영향

정준오(Joon Oh Jung),안정희(Jeong Hee An) 大韓環境工學會 2001 대한환경공학회지 Vol.23 No.6

우리나라 환경공학 및 유사명칭 학과의 교과 과정 분석

정준오(Joon-oh Jung) 대한환경공학회 2019 대한환경공학회지 Vol.41 No.8

본 연구에서는 국내 환경 분야 전공 학과의 개설 현황 파악과 전국 주요 15개 대학의 환경공학 전공을 중심으로 개설 교과목에 대하여 교과과정을 분석하였으며, 산업계의 요구분석을 바탕으로 현 교과과정의 시사점과 개선점을 토의하였다. 2018년 12월 현재 환경관련 전공을 운영 중인 대학은 총 71개교였다. 교과과정의 분석 결과는 전공 교과과정 중 수질, 대기 분야에 편중 현상이 심화되어 있었다. 이들 전공분야는 일부 대학에서 교과목을 지나치게 세분화하여 교과목 간 교과 내용의 차별성이 부족한 경우와 교과목이 학부에서 단일 교과목으로 한 학기 다루기에는 수준과 분량이 과다 할 것으로 보이는 경우가 있었다. 따라서 구성원간 교과목 정보의 공유와 교과과정의 지속적인 개선을 통하여 단순 교과목의 양적 팽창보다는 교과과정을 보다 밀도 있게 구성하고 실무에 활용할 수 있는 다양한 환경주제를 포함한 교과목의 개설 확대가 필요하다고 판단된다. 아울러 유관 학회를 중심으로 산업계의 요구와 향후 환경 분야 발전 방향을 고려한 표준화된 교과목 및 교과내용의 제시하는 역할이 필요하다. In this study, it was investigated that the current status of universities offering environmental field studies in Korea and the curricula were analyzed among 15 universities chosen from the above environmental engineering majors. The implications and improvements of the curricula were discussed based on the proposed curriculum derived from the needs of industry in the environmental field. As of December 2018, a total of 71 universities have offered the environment-related majors nationwide. The results of curricula analysis showed that the courses related in wastewater, air pollution were excessively focused among major courses of study. This seems to be due to the placement of subjects which were too much fragmented in contents and/or which were beyond undergraduate level. Therefore, through the sharing of course information among faculty members and continuous effort to improve courses, the curriculum should be structured more densely than quantitative expansion of courses. It is necessary to increase the courses that include various environmental topics that can be used in practice. In addition, the academic institutes need to play a role to develop the standardized curriculum and contents considering the needs of the industry and the prospect of the environmental field.

열가소성 수지를 이용한 전기로 제강분진의 고형화에 관한 연구

정준오(Joon Oh Jung),정진(Jin Jung) 大韓環境工學會 1999 대한환경공학회지 Vol.21 No.4

유기성 폐기물의 발생 악취 제거를 위한 Delftia sp.의 성장조건 최적화

권혁구,정준오,추덕성,이장훈,Kwon, Hyuk-Ku,Jung, Joon-Oh,Chu, Duk-Sung,Lee, Jang-Hoon 한국환경보건학회 2009 한국환경보건학회지 Vol.35 No.5

We isolated and identified a microorganism which was excellent for ammonia oxidation in the biological control of ammonia gas in odor producing materials from organic composting. The isolated strain was tested for growth characteristics and ammonia elimination efficiency under various conditions of temperature, pH, carbon concentration and ammonia concentration. The strain was isolated from a culture broth used in a $NO_2$ producing test with Griess-Ilosvay reagent. The results of 16S rRNA sequence from the isolated strain by using BLANST (Basic Local Alignment Search Tool) and confirming RDP (Ribosomal Database Project II) and ERRD (The European Ribosomal RNA Database) indicate that the strain is related to Delftia sp. UV-Spectrophotometer (Shimadzu, UVmini-1240) was used as a microbial growth test by measuring turbidity on OD660nm and ammonia concentration was measured by Spectrophotometer (HACH, DR-4000). The optimum growth culture conditions of the ammonia oxidizer Delftia sp. were $30^{\circ}C$, pH 7, glucose concentration 1.00% and $(NH_4)_2SO_4$ 0.5 g/l. Ammonia elimination efficiency was over 94% under the same conditions.

암모니아산화세균 Brevundimonas diminuta의 분리 및 암모니아 산화 특성

권혁구,정준오,Kwon, Hyuk-Ku,Jung, Joon-Oh 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.4

The microorganism for ammonia gas removal was isolated from composting product. This was identified as Brevundimonas diminuta by morphological, biochemical characteristics study and 16S rDNA sequence analysis. Optimal incubation temperature for cell growth and oxidizing ability of $NH_4-N$ was $30^{\circ}C$ and optimal initial pH was 7. Glucose affected the growth of cell and the removal of $NH4^+$. The growth rate of the isolates were increased when grown in the presence of 0.05-1%(w/v) glucose in the selective medium and lurker increases in glucose concentration to 2% caused significant decreases in the cell growth and oxidizing ability of $NH4^+$.

오일응집을 이용한 생활폐기물 소각 비산재 중의 탄소성분 회수

송오용 ( Oh-yong Song ),정준오 ( Joon-oh Jung ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회지 Vol.36 No.2

Fly ash, generated from the incineration of municipal solid waste, contains substantial amount of carbonic matter. High carbon content fly ash, when used as the cement admixture, causes adverse effect for the formation of concrete because carbon particles promote the consumption of air-entraining reagent and reduce the durability of the concrete. Therefore, in order to recycle the fly ash, it is essential to develop an effective technique to recover or remove the carbonic matter. In this study, oil agglomeration technique was applied to recover carbonic matter in the fly ash. Typical parameters, which affect the separation of carbonic matter from fly ash were investigated. The parameters are slurry pH, slurry density, agitation speed, an oil type and dosage. The separation effects were expressed in terms of recovery rate of carbonic matter from the original fly ash and the purity of aggregate. The study showed that oil agglomeration produced the best recovery of carbonic matter about 61.7% with high purity (90%), with the experimental conditions of pulp pH 5, agitation speed 3,000 rpm, use of kerosene with 20% dose (dry solid wt. basis). The 61.7% recovery of carbonic matter left over 3.9% of carbonic content in the fly ash which satisfied the guideline of 5% or less carbon content for recycling as cement admixture. However, further research is required to enhance the recovery of carbonic matter, considering the surface characteristic of both carbon and inorganic particles in fly ash.

오일응집법에 의한 생활폐기물 소각 비산재 중의 탄소성분 회수

송오용(Oh Yong Song),정준오(Joon Oh Jung) 대한환경공학회 2004 대한환경공학회 학술발표논문집 Vol.2004 No.12

악취가스 제어를 위한 Bio-filter 담체의 특성 비교

이혜성,추덕성,정준오,Lee, Hye-Sung,Chu, Duk-Sung,Jung, Joon-Oh 한국환경보건학회 2008 한국환경보건학회지 Vol.34 No.1

Bio-filtration utilizes microorganisms fixed to a porous medium to metabolize pollutants present in an air stream. The microorganisms grow in a bio-film on the surface of a medium or are suspended in the water phase surrounding the medium particles. Therefore, bio-filter support media play one of the most important key roles in bio-filtration of gas phase pollutants. To characterize and select the appropriate support media, gas adsorption capacity and microorganism immobilization were investigated in lab-scale experiments for the selected target support media which were compost I (compost from lab-scale process), compost II (compost from municipal facility), bark, wood chip, orchid stone and vermiculite. As odor materials, ammonia and trimethylamine were utilized. From the result of experiments, bark was superior to any other support media tested in adsorption capacity as much as 12.5 mg ammonia per 1 g bark. In trimethylamine adsorption, bark and wood chip showed a remarkable results of 21.1 and 14.1 mg/g respectively. On the other hand, microorganism fixation test determined by the count of nitrogen oxidizing microbes population, the compost II and wood chips showed the best results. Considering the characteristics of materials and the operating condition of the bio-filter, bark, wood chip, and compost II are applicable to the support media of bio-filter when they are appropriately blended on the basis of studying the media pH, packing porosity and moisture contents.