정밀여과 공정에서의 역세척에 관한 연구

이기완,최충현,이남경 동신대학교 환경연구소 1999 환경연구 Vol.4 No.1

정수처리 공정의 원수 및 응집/침전 상징수와 하수처리 공정의 원수를 대상으로 MF를 적용하여, 각 시료수의 역세척 특성을 파악하였다. MF의 여과지속기간은 시료수의 투과속도가 1/2로 감소되는 시점과 여과압력은 1 kg/cm²의 조건에서 실험을 수행하였다. MF의 투과속도는 정수 및 하수처리 공정의 원수인 경우 1시간이내, 정수처리 공정의 응집/침전 상징수인 경우 2시간 이내로 나타났다. 정수 및 하수처리 공정의 원수인 경우 MF의 역세 회복율 및 역세 소요시간은 각각98%와 5~6분 및 7~8분으로 나타났다. The backwashing characteristics of three kinds of sample water was studied with the application of MF(Micro Filtration) process. The three kinds are raw water and clarified water at water treatment process and raw water at sewage treatment process. The tests were performed with the filtering duration of MF to the half permeability arriving time and the filtering pressure 1 kg/㎠. The MF permeability of the raw water at the both process was less than 1 hour and that of the clarified water at water treatment process was less than 2 hour. The recovery rate and the consume time of backwashing for the raw water were 98%, 5-6 minutes and 99%, 7-8 minutes at the water and sewage treatment process, respectively.

Survey of the algal flora of Jeju Island

이기완 제주대학교 해양연구소 1976 해양자원연구소연구보고 Vol.1 No.-

The author intends to reports on the algal flora and communities on Jeju Island. which was carried out the periods of April, 1971 to December, 1975. The total investigatej algae are 212 species of marine algae. Of these, 3 species are beling to Cyanophyta, 36 species to Chlorophyta, 50 species to Phaeophyta, and the rest 123 to the Rhodophyta. From the standpoint of the phytosciological distribution, Jeju Island belong to Same category of Tsushima Island with the central part of Japan, Microdiciyon japonicum, Merislocheca pzpilosa, Actinotrichia fragllis etc. presented in Jeju Island for temper-ate elements. Algal coverage was observed by the author in 1974.

한국 해산남조류 : 1. 동해안

이기완 제주대학교 해양연구소 1982 해양자원연구소연구보고 Vol.6 No.-

분리막 시스템을 이용한 정수공정의 연구

이기완,고태석 동신대학교 환경연구소 1998 환경연구 Vol.3 No.1

황룡강을 수원으로 하는 상수원수와 침전상징수의 정수를 위하여 MF(정밀여과)공정을 적용하였다. 현장에서의 실험결과는 낮은 운전압력일수록 높은 탁도 제거율을 보였으며, 상징수의 탁도는 2~4 NTU로서 MF처리시 1kg/㎠에서는 0.3~0.4 NTU로 2kg/㎠에서는 0.4~0.5 NTU로 감소되었다. 이들 유출탁도는 음용수 기준인 1.1 NTU를 민족 할 정도이었다. 원수는 15~20 NTU의 높은 탁도로서 원수를 직접 MF처리할 경우, 유출수는 1kg/㎠에서 1.9~4.8 NTU로 2kg/㎠ 에서 2.1~4.9 NTU로 나타났다. 이들 탁도는 처리수 기준을 초과하였으므로, 기준을 만족하기 위해서는 다단계의 MF 처리가 권장된다. 막 의 역세척 소요시간은 약 6분이 적합하였다. MF처리공정은 재래식 모래여과기와 비교할 때 작은 소요부지 면적, 막의 내구성과 수명, 약품비등에서 수처리에 효과적임을 보여주었다. MF(Micro Filtration) process was applied to the treatment of raw water and clarified water in water treatment plant sourced from the Hwangryong river. As results of experiments and field study the lower the operating pressure, the higher the turbidity removed. Turbidity of clarified water were reduced from 2~4 to 0.3~0.4 NTU at 1kg/㎠ and 0.4~0.5 NTU at 2kg/㎠ by MF process. These effluent turbidities were acceptable to the drinking water standard of 1.1 NTU. For the raw water of high turbidity with 15~20 NTU the effluents were 1.9~4.8 NTU at 1kg/㎠ and 2.1~4.9 NTU at 2kg/㎠. These turbidities exceeded the standard value of treated water. To meet the standard, multistage operations were executed with the raw water and its turbidity decreased to 0.1 NTU. The proper time for backwashing of the unit was about 6 minutes. Compared with a traditional sand filter, MF process showed the effectiveness of Water treatment due to small area, long life spans and less chericals required.

濟州道 西貴浦沿岸 植物性 플랭크톤의 季節變化 : 1. 夏季節 植物性 플랭크톤의 種의 分布와 量的組成 1. A study on the distribution of species, quality and specipic composition of phytoplankton in summer season

이기완 濟州大學 臨海硏究所 1979 해양과환경연구소 연구논문집 Vol.3 No.-

This present paper deals with a study on the distribution of species, quantity and specific composition of phytoplankton at the Seogwipo coast of Jeju-Do, which were obtained in June∼August 1979. Collected phytoplankton were 31 species totally, 16 species belong to genus Chaetoceros. 4 species to Rhizosolenia, 2 species to Nitzschia, 2 species to dinoflagellate, and other 1 species to diatoms as follows. Chaetoceros afinis, Ch. didymus, Ch. didymus. v. anglica, Ch. didymus v. prototuberans, Ch. decipiens, Ch. compressus. Ch. debilis, Ch. distsans, Ch. pseudocrinitus, Ch. peruvianus, Ch. lorenzianus, Ch. borealia, Ch. weissflogii, Ch. radicans, Ch. anastomosans, Ch. sp., Rhizosolenia stolterfothii, Rh. fragilissima, Rh. habetata, Rh. robusta, Nitzschia seriata, N. sp., Melosira sp., Ditylium brightwellii. Thalasiothrix nitzschioides, Pleurosigma offine, Navicula sp., Ceratium fusus, Skelletonema costatum, Peridinium pellucidum, Gymnodinium sp. The total individuel cells of phytoplankton were 510, Chaetoceros(248 cells, 48.63%), Rhizosolenia(156 cells, 30.59%), dinoflagellate(75cells, 14.7%), and other 1 genus of diatoms(31cells, 6.08%) in descending order. 18 species belong to 4 genera were typical species in the coastal water of Curoshio current, the species which appeared through a year were 2 species to 1 genus, 5 species to 4 genera were typical species of cold water.

高密度 魚類養殖을 위한 效率的인 循環水 處理씨스템에 관한 硏究

李基完,羅德寬 순천대학교 공업기술연구소 1992 工業技術硏究所論文集 Vol.6 No.-

The purpose of this paper is to development the more effective treatment system of recycling water for the high-density fishfarming. Investigations through analysis of quality for the fishfarming water and the experimental treatment using the designed system with Biological Fluidized Bed(BFB) reactor have been performed for the recycling water in fishfarming. The obtained results showed that water quality in breeding pond was affected by the light cycle and vitalities of fishes and recycle flow range showing the most effective solid removal rates of the settler in system which was designed specially was near of 0.25ℓ/sec. Oxygen transfer rates in the aeration system consistes of four-column tower were in proportion to recycling flow rates of water. And also, the effluent BOD load in biological water treatment system using BFB reactor could be decreased to 65% than other existing water reuse aquaculture system with filter media.

팔공산 화강암지역 지하수에 대한 지구환경화학적 연구

李基完,朴喜烈 東新大學校 1997 論文集 Vol.9 No.-

Recently, the importance of groundwater is higher as the use of groundwater for drinking, agriculture and industry sisnificantly increases. However, groundwater has been contaminated by industrial waste, domestic sewage, landfill leachate and seawater intrusion. Therefore, it is necessary to understand the chemical characteristics and water-rock interaction of groundwater for the preservation of groundwater resources. The purpose of this study is to find out the magnitude of groundwater contamination, and its water-rock interaction characteristics in granitic regions. The Cretaceous Palgongsan granitic regions are selected as the study area. The results are as follows : Groundwater is contamimated by NO_3^- in a Part (CP-3, CP-4, CP-5) of study region. K^+/Na^+ in groundwater of study legion is equivalent to 1/10 for K_2O/Na_2O of rock. Groundwater's evolution is being progressed to noncarbonate hardness tupe of Ca^2+ -HCO_3^-, continuously noncabonate alkali type of Ca^2+, Cl^-, SO_4^2-. Saturation index of aluminosilicate minerals for groundwater is dominated kaolinite. This indicates the initial evolution process of groundwater.

Unrecorded Marine Algae From Korea II

이기완 濟州大學校 師範大學 科學敎育硏究所 1984 科學敎育 Vol.1 No.-

光州地域 工業團地의 廢水排出 特性과 效率的 管理

李基完 동신대학교 환경연구소 1995 환경연구 Vol.1 No.1

광주지역의 공단폐수처리 및 관리에 관한 연구를 수행하였으며 기존씨스템의 현황과 문제점 분석을 통하여 얻은 결과는 다음과 같다. 즉, 광주지역에는 4개 공단이 있는데 폐수배출을 주도하는 업종은 금속광물류이며 가장 큰 BOD원은 본촌공단으로서 총 BOD부하량의 65.6%를 점유하고 있다. 단위업소당 평균유량을 기준한 폐수발생비중이 큰 순서는 음·식료, 금속·광물류, 섬유류 순 이었고 용수사용에 대한 폐수사용 비율은 음·식료와 금속·광물류 0.56, 섬유류 0.85 로서 폐수의 체계적 관리를 위하여는 업소에서의 계통별 물수지분석이 긴요한 것으로 판단되었다. 업종별 방류수의 S-BOD_(5), S-COD_(Mn), S-COD_(Cr), 농도는 각각 3∼83mg/ℓ, 7∼140mg/ℓ, 20∼900mg/ℓ로서 수질규제 기준에 만족된 수준이라 할 수는 없는 상황이었으며, 더욱 엄격한 관리를 위하여는 BOD농도보다 COD농도에 관심을 가져야 하고, 특히 COD에 있어서도 앞으로 강화될 수질규제에 능동적으로 대응하려면 KMnO₄법보다는 K₂Cr₂O_(7), 법에 의한 측정수단이 더욱 효과적일 것으로 판단되었다. 공단업소 대부분의 방류수는 k(유기물 분해속도상수)값이 0.006∼0.024day^(-1), (BOD/COD)比 0.024∼0.325로서 상당량의 난분해성 유기물질이 포함되어 있는 것으로 판단되었다. 업소는 급변하는 국제정세에 부응하여 환경문제와 관련된 사내 외 교육체계를 유지할 필요가 있다. 또한, 기존의 개별업소 폐수처리방식은 그룹화된 유사업종별 공동방지시설 운영방식으로 개선될 필요가 있으며 이 경우, 공동방지시설의 처리공법은 BOD보다는 COD중심으로 검토함이 바람직할 것으로 판단되었다. A study on the management and treatment of industrial wastewater in Industrial Parks of Kwang-Ju has been performed. The obtained results from the experiments or the literatural data analyses of the present status and problems on the existing systems for wastewater were as follows; There are four Industrial Parks in Kwang-Ju and metals & minerals industries take the lead in discharge of industrial wastewater. The biggest BOD source in four industrial parks is Bon-Chon Industrial Park with 65.6% of total BOD loads. The biggest effluent flow among the industries is the beverage or foods industry on base of average flowrate per each similar factory by industry, and the second of big industry is metals & minerals (42 %), the third is fibers (8 %) in mass order. The estimated flowrate ratios of the effluent wastewater to the supply water were 0.56 in beverage or foods industry, 0.85 in metals & minerals respectively. So, it was considered that analyses about the flow balance of water from supply step to effluent step are important for the effective and systimetical management of industrial wastewater. Concentrations of the effluent wastewater for factories to be surveyed are 3∼83mg/ℓ, 7∼140mg/ℓ and 20∼900mg/ℓ, respectively for S-BOD_(5), S-COD_(Mn) and S-COD_(Cr). These qualities are not enough to satisfy the legal regulation, therefore it was considered that COD base is desireable than BOD base in the parameter of water quality for the more strict management. Especially also in COD concentration, COD_(Cr), concentration by the potassium dicromate(K₂Cr₂O_(7)) method would be better than the potssium permanganate (KMnO₄) method for the more active mamagement of water quality. As for the BOD/COD correlations of the effluent with 0.006∼0.024 day^(-1) of k values, ratios of them are 0.024 ∼ 0.325, and it was estimated that a much of non-biodegradable organic matters should be contained in most of effluent wastewater from Industrial Parks. The company or factory needs to make inside- or outside-education systems related with environmental problems tighten a little more for the rapidly changing international situation in near future. And also, it was considered that the joint treatment system by group would be better than the existing individual treatment system for the similar factories and the treatment method is to be reformed from the BOD first management order to the COD first.

제주대학 임해연구소 부근의 해조분포 및 식생

이기완 제주대학교 1974 논문집 Vol.6 No.-

저자가 1974년 3월부터 1975년 2월에 걸쳐 1년간 조사한 제주대학 임해 연구소의 해조분포 및 식생은 아래와 같다. 1) 채집된 해조는 모두 101종으로 녹조류 18종, 갈조류 36종, 홍조류가 47종이다. 2) 이 지역의 대표적인 해조군집은 ① Porphyra-GloiopeltiAssociation; ② Ishige Association; ③ Hizsikia fusiforme Association; ④ Sargassum Association; ⑤ Collaina Association으로 식물 사회학적인 분포로 보아 Hizkietum Taniputi에 속한다. The annual variation of marine algal flora including 101 species in all(18 species of Chlorophyta, 36 species of Phaeophyta, 47 species of Rhodophyta), was observed at Marine Laboratory of Cheju University near Seogwipo for one year from March 1974 to February 1975. Five typical algal association were observed at the observed station; 1) Porphyra Gloiopeltis Association; 2) Ishige Association; 3) Hizikia fusiforme Association; 4) Sargassum Association; 5) Corallina Association.