마을하수처리시설(BBF-DNS공법)에서 응집 및 질소처리공정 효율 향상에 관한 연구

박옥현 ( Ok-hyun Park ),위환 ( Hwan Wi ),김승호 ( Seung-ho Kim ),공화진 ( Wha-jin Kong ),장길식 ( Gil-sik Jang ),배석진 ( Seok-jin Bae ),조영관 ( Young-gwan Cho ),김은선 ( Eun-sun Kim ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.2

In this study, small-size rural sewage treatment facility with BBF-DNS method were diagnosed treatment efficiency and investigated how to improve facilities by process. The coagulant was added to the coagulating sedimentation tank by using a stream of influent water to which sewage was pumped as a raw solution. The biofilter tank continuously was injected oxygen through the oxygen feed pump and prevented the filter pores from being blocked by the influent. In the denitrification tank, the backwash plate was reinstalled to uniformly disperse air during the backwash and the number of backwash was increased to prevent re-contamination by the sediment. The BOD of the effluent before the facility improvement was 9.2 mg/L, COD of 16.4 mg/L, SS of 15.1 mg/L, T-N of 24.289 mg/L and T-P of 1.974 mg/L, respectively. After the facility improvement, effluent BOD was 3.7 mg/L, 97.2% of the treatment efficiency compared to the influent, COD was 11.6 mg/L, 80.5%, SS was 7.2 mg/L, 95.4%, T-N 8.258 mg/L was 75.5% and T-P was 1.013 mg/L, 76.9% and all items met the effluent quality standards of the public sewage treatment facility. The nitrification rate was 32.4% and the denitrification rate was 41.1% before the facility improvement, but were improved to 76.9% and 86.2%, respectively.

수죽력과 수죽력 스팀 추출물의 항균활성 및 아질산염 소거작용에 관한 연구

박상일 ( Sang Ill Park ),최형일 ( Hyung Il Choi ),위환 ( Hwan Wi ),박대훈 ( Dae Hoon Park ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.3

In the present study, we evaluated the antibacterial activities and Nitrite scavenging ability of bamboo sap and bamboo sap steam extract. Our analysis revealed that the total phenolic compounds containing the tannic acid in the bamboo sap extract showed 12.7% and in the case of bamboo sap steam extract was 20.9% respectively. The nitrite scavenging ability of bamboo sap steam extract showed about 51%. The antibacterial activities of bamboo sap steam extract on Bacilus subtilis, Listeria monocytogenes, Salmonella choleraesuis subsp. Choleraesuis and Escherichia coli were 13.8, 12.0, 13.5 and 8.3 mM respectively. Furthemore, the bamboo sap steam extract have showed thermostability and no effect on their antibacterial property under themal conditions. Therefore, this finding is useful for the utility of these compounds as additives in food preservations.

녹차종자를 이용한 캐리어오일에 관한 연구

김용현 ( Yong Hyeon Kim ),박상일 ( Sang Ill Park ),위환 ( Hwan Wi ),김학선 ( Hak Sun Kim ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.2

This study in order to use the green tea seed with the carrier oil investigated the physicochemical characteristics of green tea seed, fatty acids, crude saponin and refining conditions. Saturated fatty acids of the green tea seed oil were analyzed with palmitic. palmitoleic, heptadecanoic, stearic acid and the unsaturated fatty acids were analyzed with oleic, linoleic, linolenic, eicosenoic acid. Oleic acid content was the highest at 54.2%. Unsaturated fatty acids (82.25%) of green tea seed oil ratio to Saturated fatty acids (17.75%) is about 82 : 18. The green tea seed oil observes with the fact that in order for the unsaturated fatty acids content to be high very it will be able to apply with the plant resources. In order for the unsaturated fatty acids content of the green tea seed oil to be very high it must be able to apply with the plant resources.Acid value of the oil which is refined with alkali-refine, bleaching, deodorizing process O.72(mg KOH/g), iodine value is 91.97(g/100g), peroxide value is 1.87(meq/kg), saponification value is J87.8(mg KOH/g).

수죽력과 수죽력 스팀 추출물의 이화학적 특성에 관한 연구

김용헌 ( Yong Hyeon Kim ),정경훈 ( Kyung Hoon Cheong ),박상일 ( Sang Ill Park ),위환 ( Hwan Wi ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.3

In this study, the Physicochemical Characteristics of bamboo sap and bamboo sap steam extract was analyzed. The crude protein and crude fat content of bamboo sap was 0.64% and 0.53%, bamboo sap steam extract was 0.65% and 0.51%, respectively. Solid content of bamboo sap (3.2%) was more then the bamboo sap steam extracts (1.6%). Mineral contents of bamboo sap steam extract were K (512.9 mg), Mg (34.8 mg) and P (62.1 mg). The free sugars present in bamboo sap steam extractsuch as sucrose, glucose and fructose were each 1.05, 0.65 and 0.41 %. respectively. The organic acid contents in bamboo sap steam extract shows malic acid (60.8 mg) and acetic acid (47.2 mg). The amino acid contents in bamboo sap steam extract such as serine, glutamic acid, alanine and arginine were 13.6, 13.9, 11.7 and 11.6 mg respectively.

광주지역 음용 지하수 중 미네랄성분의 분포

안상수 ( Sang Su An ),강영주 ( Yeong Ju Kang ),위환 ( Hwan Wi ),김종민 ( Jong Min Kim ),이윤국 ( Youn Goog Lee ),박옥현 ( Ok Hyun Park ),박종태 ( Jong Tea Park ),백계진 ( Ke Jin Paik ) 한국환경분석학회 2009 환경분석과 독성보건 Vol.12 No.3

Samples of ground water using as potable resources were collected in the five districts of Gwangju city.. Anionic and cationic substances in ground water were monitored to review the compliance as a drinking water source. Average distribution of anionic ingredients in the ground water by district was Donggu>Bukgu>Namgu>Seogu>Gwangsangu. Average distribution of inorganic substances on the ground water by district was Seogu>Donggu>Bukgu>Namgu>Gwangsangu. The highest contents of anionic substance were detected in Donggu and the lowest in Gwangsangu. The contents of anionic matter by district was Cl->SO4(2-)>NO3-N>F-. The highest contents of minerals were in Donggu. The result of contents of cationics by area was Na>Ca>Mg>K. There was close correlation among the minerals (Na, Ca, Mg, K). In case of Na, Ca, Mg and K, the results of this study were satisfied with the water standards of UK and twice higher than the drinking water sold in Gwangju.

철도교통소음의 수평·수직적 전달 및 감쇠 특성

최형일,정원삼,김난희,강영주,위환 조선대학교 환경공해연구소 2006 環境公害硏究 Vol.19 No.1

This study has been conducted to achieve the following objectives: First, in order to understand the horizontal propagation and attenuation characteristics for the railroad traffic noise, we selected actively developed areas within 100 meters away from the road to measure the level of traffic noise near a road. To measure the noise near a railroad, we selected areas within 100 meters away from the railroad and then selected Saemaul-ho and Mugoongwha-ho as the subjects for our experiment, In this way, we analyzed the horizontal propagation and attenuation characteristics for the traffic noise occurring in diversified areas. Second, in order to understand the vertical propagation and attenuation characteristics for the railroad traffic noise, we measured and analyzed the distributional characteristics of vertical sound pressure levels on each floor of multi-storied apartment buildings according to changes of traffic load and types, and the existence or nonexistence of soundproof walls. For the case of the railroad traffic noise, we also selected Samaul-ho and Mugoongwha-ho as the subjects for our experiment, and we measured and analyzed the different noise levels on each floor of multi-storied apartment buildings from the soundproof wall. The results of Horizontal propagation and attenuation characteristics for the railroad traffic noise are as follows: In cases of the flat land, cutting land, and bridge area, as distance increases, the sound pressure level steadily decreases. The cutting land has an especially high distance decrease compared to the other areas, and the sound pressure level for the bridge area is higher than that of the flat land with a measurement of 9.7~17.5㏈(A). Vertical propagation and attenuation characteristics for the railroad traffic noise are as follows: The amount of sound pressure level decrease is 13.9~15.4㏈(A) for Samaul-ho and 10.9~11.5㏈(A) for Mugoongwha-ho when measuring the vertical sound pressure levels at heights lower than 4.5m, which indicates a fairly large decrease. At 6m, the amount of decrease is 7.3㏈(A) for Samaul-ho and 5.0㏈(A) for Mugoongwha-ho, which indicates a small decrease.

학교소음이 학업성취에 미치는 영향

정경훈,박상일,강영주,위환,염동익 조선대학교 환경공해연구소 2006 環境公害硏究 Vol.19 No.1

The reason for the school noise problem located in the city is due to the fact that this noise is aroused by the development of industrial facilities that give too much importance to certain provinces and the cityward tendency of the population and so on. which is scattered nearby school, In addition, the indoor noise caused by the students themselves is loud. It damages the environment as would a loudspeaker, and the noise from the school itself compounded with the noise from outside raises a serious problem. Measure and analysis of the actual condition of this school noise shows its influence and effect on scholastic achievement. Noise can be felt through a man's sense, and it can be felt differently according to an individual's habit, and the time and place. That's why the physical amount, which is measured by a measuring instrument, can't display the grades of noise. The results of a survey show that students' attitudes toward noise and the students' psychological reactions are more apparent in those who take part in classes located in the south building, which is exposed to a large amount of noise from highway traffic. One important factor in the different degrees of school noise is that it becomes louder as one travels higher within the building. We can determine the different effects by comparing the scores of students from various classes. For instance, the scores of students who are exposed to this noise will be compared with those who are not. To survey how much the students themselves are effected by the noise in their studying atmospheres, we selected the north building, which the noise does not penetrate as readily as it would another building and where the measure of the noise amount(Leq, 10 min.). As a result, the classes' records will show the data between the areas where the amount of noise is high and those where the amount of noise is low. It is economically and actually difficult to make a countermeasure for the schools that are influenced by noise, but we should make plans to allocate flexible arrangements of classes and time tables, and to create a good environment for teachers to utilize their professionalism in their own subjects, a variety of teaching skills and the teaching techniques necessary to work with the various levels of the students.