김영철 , 원찬희 , 정팔진 Young Chul Kim , Chan Hee Won , Paul Gene Chung

DOI: Vol.7(No.1) 1-8, 1991

Currently, the effective treatment of industrial wastewater and the economical treatment problems are new concerns to both of industries and environmental engineers. People`s requirement for better environmental quality is rapidly increased. Furthermore, the revaluation works on the existing environmental protection facilities and the research activities for the new treatment technology are becoming a mainstream of environmental studies. Thus, it is very meaningful to analyse and investigate the operating conditions of the wastewater treatment systems with the field data in distillery industries. Distillery wastewater has been known to be very complex and difficult to treat. Treatment processes very similiar to that of nightsoil in the light of high strength organics` stabilization. In this study, treatment data(possible to collect) of the three different distillery industries is directly analyzed and investigated, such as COD load, CH, production and contents, COD removal eff. etc..

이흥재 , 이형진 , 한진석 , 권숙표 Hung Jae Lee , Hyung Jin Lee , Jin Suk Han , Sook Pyo Kwon

DOI: Vol.7(No.1) 9-19, 1991

In this study 14 items of surface water quality of Incheon coastal area were analyzed. And samples were gathered four times a year periodically from April 1985 to October 1988. Varimax rotation was adopted for further explanation of initial factor matrix. From this method five factors were extracted. The results of this study were as follows; 1. An average concentration of COD, SS, T-N, PO₄-P were l.5 ㎎/ℓ, 22.5 ㎎/ℓ , 427.0 ㎍/ℓ and 73.3 ㎍/ℓ respectively. And water quality of Incheon coastal area was deteriorated gradually. 2. From the principal component analysis, variance of Factor 1 was 30.2 %. From Factor 2 to Factor 5, the percent of variance were 13.9%, 10.9%, 8.3% and 7.2% respectively. Therefore cumulative percentage of variance from Factor 1 to Factor 5 was 70.5%. 3. Factor I was artificial pollution pattern by domestic wastewater and industrial wastewater, Factor 2 was natural pollution pattern by precipitation, Factor 3 was physical property pattern by water temperature and dissolved oxygen, Factor 4 was oil pollution pattern and Factor 5 was conservative salinity variation pattern. 4. The groups of sampling sites which were influenced by tidal current in the Incheon coastal area were confirmed. And it is possible to explain partially that the boundaries which were affected by inflow streams through Principal Component Analysis with salinity, SS and PO₄-P.

강정구 , 박후원 , 최의소 Jung Goo Kang , Hoo Wen Park , Eui So Choi

DOI: Vol.7(No.1) 20-24, 1991

The high moisture and organic contents of food wastes from the residential sources are an obstacle factor for the waste disposal and energy recovery process such as incineration and pyrolysis. In addition, the anaerobic nightsoil treatment plants in this country are experienced with a decreasing waste load due to the rapid conversion toward the modern toilet system. In order to overcome these difficulties, the application of the anaerobic treatment using the mixture of nightsoil and food wastes would be an alternative treatment process. This study was therefore focused to determine design parameters for the anaerobic treatment for nightsoil and food waste mixture. The experimental results indicated that treatment efficiencies measured by VS and COD reductions, gas productions and gas portions were varied with organic loadings and mixture ratios of nightsoil to food waste.

최순영 , 이명혜 , 황문옥 , 이창섭 , 민경희 Soon Young Choi , Myung Hye Lee , Moon Ok Hwang , Chang Sup Lee , Kyung Hee Min

DOI: Vol.7(No.1) 25-30, 1991

Four crude oils (Arabian light, Iran light, Oman, Libya) of different chemical composition were tested as to their biodegradability under mesophilic condition. Changes of the chemical composition of the crude oils by Xanthomonas campestris M12 were monitored using the gas-liquid chromatography. The ability of X. campestris M12 to use crude oil as a sole carbon source was not dependent on the composition of the n-saturate or aromatic fraction, but on that of the asphaltic fraction. The biodegradability of the Arabian light crude oil was found to be highly dependent on an incubation temperature. It was shown that addition of 0.1 % tween 80 to the incubation medium increased bacterial growth and biodegradability at 30℃ rather than that at 37℃.

주흥규 , 박봉헌 Heung Kyu Joo , Bong Heon Park

DOI: Vol.7(No.1) 31-46, 1991

The investigation of Physico-chemical water quality and the composition of aquatic organism communities were made from August to September 1988 in the fresh water and seawater areas of Kei-do island, Nabul-do island and Oey-do island around the Young-san Dam. We could get the results as follows ; 1. The consumption of KMnO_4, in the underground water and the criterion of drinking water of general bacillus, and the group of colon bacillus is based on the lack of the hygienic sense for the underground water control of this residents. 2. It is not seemed that the condition of pollution of small river, flowing from the Nabul-do island and Oey-do island to the Young-san Dam, is serious on the physico-chemical point of view, Coliform Group appears high as 4.4×10^3~1.8×10^4 which will affect to the pollution of Young-san dam. 3. The rate of dissolved oxygen in the surface water is rate high as 8.1~9.8ppm, in bottom water as 7.2~9.4ppm. Because the geographical condition of the Young-san dam is different from that of other area in this country there is no higher mountain around it, the dam of Young-san is very wide, affected by the wind, the surface of water runs high, the air contact of water is so wide. 4. BOD and COD make little difference in the surface water and intermediate water, and points of investigating areas. That is ; BOD is 1.5~3.4ppm in surface water, 1.4~3.4ppm in intermediate water, COD is 3.1~5.7ppm in surface water, 3.2~5.2ppm in intermediate water. This result shows that there is no particular outlet source which causes the point source contamination around the Young-san dam. 5. The floating materials show the various distribution at the points of investigation are-as, however that site 2 appears 24~29ppm, the highest rate, is that the widely prevalent fishing net fishery is more source of pollution than the many kinds of shellfish lives in this area. 6. The nutritive salt that is the important materials to decide the nutrition is 0.33~0.61ppm in total nitrate, 0.11 ~0.23ppm in total phoshate with comparatively low. The reason that T-N is 0.58~0.61ppm and T-P is 0.21~0.23ppm with the highest rate of measurement on August in site 1 is because very wide farm land locates in this area and the mixed fertilizer is flowing into this dam during this month. 7. Salinity is not affected by the tied after the construction of the dam, but it is indicating the 78~150ppm in surface water, 83~248ppm in intermediate water by the seawater mixing with freshwater through the outlet gate and gate for shipping and that shows as-pects of water quality of estuary area. 8. District Kwangju city, Naju city, and many small towns are located in upper the Young-san, dam, so that domestic sewage is flowing into the dam without sewage theatment. E. coil indicates the 1.0×10~5.2×10^3 at every points of investigation. Thus this dam is dangerous lake with the pollution of bacillus. 9. A small amount of heavy metal is detected by the clark number because there is no such a big industrial estate around the Young-san dam that will make the water of the Young-san dam be polluted. 10. The quality of seawater around the Young-san dam is comparatively good, but is pol-luted a little by the floating materials, E. coil and n-Hexane. In case of inflow of the tide, the floating material around Mokop harbour will give an in-fluence to the dam. 11. Although the Young-san dam was constructed 7 years ago, this dam has a very different character from the other inland lakes. That is ; this dam is a kind of mixing water with seawater and freshwater everyday with oceanic plankton and fresh water`s plankton living together. The species which are observed 69 species of 40 genera belong to 6 families among which phytoplankton is 54 species, 76% of all species. Especially bacillariophyta among phytoplankton is 46 species that is 85% of all. On the other hand zooplankton among the species is 15 species, among which rotifera is 9 species, that is 60%

김원만 , 홍사욱 , 서윤수 , 최의소 , 조광명 , 류재근 , 김동군 , 이인선 , 신상철 , 이길철 , 이흥재 , 이홍근 , 박인보 , 하영칠 , 윤일병

DOI: Vol.7(No.1) 47-84, 1991