파일럿 규모의 선회식 가압부상공정에서 응집제 종류별 유해 조류 제거효율 비교

오홍석 ( Hong-sok Oh ),강선홍 ( Seon-hong Kang ),양시천 ( Shi-chun Yang ),남숙현 ( Sook-hyun Nam ),김은주 ( Eun-ju Kim ),황태문 ( Tae-mun Hwang ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.4

Dissolved air flotation (DAF), one of the most representative physico-chemical processing technologies used to remove suspended particles or algae in aquatic environment. Cyclonic Dissolved Air Flotation (DAF), a dissolved air flotation method displaying improved performance, has a structure capable of forming twirling flows that produce microbubbles that adhere to suspended matter and float to the surface of the water passing through the float separation tank. The purpose of this study is to evaluate the cyclonic-DAF process for the treatment of harmful algae in aquatic environment. The effect of coagulants type, such as PAC, PolyDADMAC and R-119, were investigated. In this experiments, algaecide named as R-119 showed the effective coagulant to remove chlorophyll-a and algae. For the effect of the coagulant dose, the removal efficiency of algae was increased as coagulant concentration increased. The optimal concentration coagulant has been similarly observed at 60 mg/L for PAC and R-119. However, PAC showed that it did not meet the number of cyanobacteria cells below the algae level suggested by the algae warning guideline. In the case of PolyDADMAC, the removal of cyanobacteria cells showed excellent results, but turbidity and suspended solids were significantly lower than that of PAC and R-119.

남조류 제거를 위한 선회식 가압부상장치 현장 적용에 관한 연구

오홍석 ( Oh Hong-sok ),강선홍 ( Kang Seon-hong ),남숙현 ( Nam Sook-hyun ),김은주 ( Kim Eu-ju ),구재욱 ( Koo Jae-wuk ),황태문 ( Hwang Tae-mun ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2018 한국환경복원기술학회지 Vol.21 No.5

Cyclonic-dissolved air flotation(Cyclonic-DAF), an advanced form of pressure flotation, applies a structure that enables the forming of twirling flows. This in turn allows for suspended matter to adhere to microbubbles and float to the surface of a treatment tank during the process of intake water flowing through a float separation tank. This study conducted a lab-scale test and pursued geometrical modeling using computational fluid dynamics(CFD) to establish a pilot scale design. Based on the design parameters found through the above process, a pilot cyclonic-DAF system(10㎥/hr) for removing algae was created. Upon developing the pilot-scale cyclonic-DAF system, a type of algae coagulant(R-119) was applied as the coagulant to the system for field testing through which the removal rates of chlorophyll-a and cyanobacteria were evaluated. The chlorophyll-a and harmful cyanobacteria of the raw water at region B, the field-test site, were found to be 177.9mg/㎥ and 652,500cells/mL respectively. Treated waters applied with 60mg/L and 100mg/L of algae coagulant presented removal efficiencies of approximately 95% and 97%, respectively. The cyanobacteria cell number of the treated waters applied with 60mg/L and 100mg/L of algae coagulant both that were equal to or less than 1,000cells/mL and were below attention level criteria for the issuance of algae boundary.

환경영향평가 단계에서의 라돈 관리에 대한 연구

김임순 ( Im-soon Kim ),오홍석 ( Hong-sok Oh ),이관형 ( Kwan-hyung Lee ),김충곤 ( Choong-gon Kim ) 한국환경영향평가학회 2018 환경영향평가 Vol.27 No.3

최근 유해한 환경요인에 의한 질병발생 등 사람의 건강에 부정적인 영향이 중요하게 다루어지고 있다. 특히, 방사성 물질이며 폐암 1급 발암물질로 알려진 라돈 노출 영향에 관한 연구가 활발해지고 있다. 한국에서도 2018년 1월 1일 이후, 공동주택을 신축할 때 라돈측정이 의무화되었다. 라돈농도를 측정해 지자체에 제출하여야 하며 주민이 볼 수 있는 곳에 공고해야 한다. 라돈은 다중이용시설에 관한 권고 기준만 있었으나 이제는 주택에도 권고기준을 설정하기로 했다. 따라서 이제는 환경영향평가 단계는 물론 사후환경조사에서도 라돈을 관리할 수 있도록 해야 한다. 라돈농도 등의 환경정보와 라돈의 위해성 등 건강정보도 공유할 수 있어야 하며, 이를 위해 환경영향평가 단계에서 보건전문가의 참여가 필요하다. 환경영향평가 과정에서 라돈이 인체 건강에 미치는 영향을 고려할 수 있도록 토양, 대기질, 위생·공중항목 등을 개선하여야 한다. 라돈의 농도가 권고기준치 이상이면 대안을 마련하고 저감방안을 마련하여야 한다. Recently, negative effects on human health such as disease caused by harmful environment have been dealt with seriously. In particular, studies on the effect of radon exposure, which is known as a primary carcinogen in lung cancer due to radioactive materials, have been actively studied. In Korea, since January 1, 2018, radon measurement is mandatory when building a new apartment, so it is necessary to measure the radon concentration and submit it to the local government and it should be posted where residents can see it. Radon has only recommended standards for multi-use facilities, but now it has decided to set recommendation standards for private homes. Therefore, it should now be possible to manage the radon in the environmental impact assessment phase as well as in the Post-environmental Impact Assessment. It should be possible to share health information such as the radon concentration and the risk of radon, and participation of health experts in the environmental impact assessment stage is required. Soil, air quality, hygiene and aerial items should be improved to take into account the effects of radon on human health during the environmental impact assessment process. If the level value of conncentration of radon shows above the recommended level, then alternative measures should be prepared and mitigation measures should be prepared as well.

상수 처리 : 수질변화에 따른 핀부착형 고효율 경사판의 운전특성 비교연구

이상헌 ( Sang Hun Lee ),최준석 ( Jun Seok Choi ),오현제 ( Hyun Je Oh ),오홍석 ( Hong Sok Oh ),김주원 ( Joo Won Kim ) 한국물환경학회 ( 구 한국수질보전학회 ) 2009 공동 추계학술발표회 Vol.2009 No.-

서울 교외선 주변의 유원지취락 : 송추 일영을 중심으로 A Case Study of the Songchoo and Ilung Districts

오홍석 서울대학교 지리교육과 1979 지리학과 지리교육 Vol.9 No.1

The purpose of this study is to clarify the regional characteristics by analyzing the form and function of the tourist settlement of Songchoo-Ilyung districts. The results are summarized as follows. The Settlement of Songchoo-Ilyung is surrounded by natural beauty which is valuable as a tourist resource. The Songchoo-Ilyung districts is about 40 km away from the Seoul city center, but it is linked by the Seoul Suburb Railway built in 1961. Seoul residents can easily visit this region by using the railway. Since the 1960's, the Seoul metropolitan area has been faced with the problem of ovetpopulatiorr and environmental pollution by the growth of the civic area. Most of the urban dwellers resort to this region for recreation, so the settlement has distinctively changed in form and function. Thirty-five to 38 percent of the weekly visitors to this area spend their holidays in this place and 57 to 62 percent of the annual visitors go there during the relatively short summer season. Both in the Songchoo and Ilyung districts, the peak month for visitors is hot August; the peak day is. a holiday or weekend. For this reason, human structures have been built such as hotels, restaurants, swimming pools, tents, stores etc., and most visitors have utilized the facilities for recreational purposes. Thirty to 40 percents of these structures are bungalows and tents. Undoubtedly, they are the urban type of human structures, and differ from the native rural type. The house of the former type distinctively is closed and restricted by roads, while that of the latter type is estabilished around a courtyard to form a rectangle. In the case of the latter, the house usually faces south, which is the common spacing type in Korea. Consequently, the rural settlement has changed from the primitive type to the geometrical form. In the case of the Songchoo distrct, the villages of Bugok and Uldae were separate from each other by about 0.7 km at the time of the railway opening, but now they are consolidated and have become a large agglomerated rural settlement, most of whose dwellers depend upon non-agricultural industry. The distinctive characteristic of the settlement also can be seen in the arithmetic data concerning population composition. The total population of both settlements has obviously increased. This contrasts with the decrease of the population of t1e adjacent rural villages. The rate of population increase during the twelve years of 1965-77 was 2.6∼4.0 percent annually; 52-56 percent of the total immigrants came from the Seoul metropolitan area. Residents have become recently faced with the problems of pollution of the local natural beauty, settlers being pushed out by immigrants. A solution of these problems seems to depend on environmental conservation.

Pyrethroid 계 농약 중독의 임상적 고찰

이철우,박규호,강문수,양동호,고봉민,배성한,전기원,박관석,정인섭,홍세용,오종용,오홍석,김명수 대한내과학회 1998 대한내과학회지 Vol.55 No.5

Objectives: Pyrethroids are commonly used pesticides, and acute human poisoning by these insecticides is common in Korea It has a high affinity to the sodium channel on cell membranes causing blockage, which results in neurotoxicity, hyperexcitation, and death. The purpose of this study was to analyze the clinical characteristics of acute pyrethroid poisoning. Methods: To evaluate the clinical characteristics (age, sex, causative agents, cause of ingestion, severity of poisoning and its clinical feature, prognosis, complication and results of the treatment), we analyzed the clinical reports of 30 patients with pyrethroid poisoning who were admitted to Soonchunhyang Chunan hospital from January 1992 to July 1997. Results: 1) 18 out of 30 patients with pyrethroid poisoning were male and the largest age group was above 60 years old. 2) The most common cause of ingestion was suicide, in 24 cases(80%). 3) There were 7 classes of causative agents of poisoning and all of these were classified into 2 grades according to the degree of WHO toxicity. Fenvlaerate and cypermethrin were the most common agents. 4) The degree of severity was classified into three groups-mild, moderate and life-threatened. Of these groups, mild poisoning was the most common. There was no significant difference in the age, type of pyrethoid and interval between pyrethroid ingestion and arriving at the emergency room between the three groups. However, the amount of ingestion was significantly higher in the life-threatened group, 5) The most common symptom of the patients was vomiting, in 19 patients, The classification were of three types (5 type I, 11 type II and 1 intermediate type) according to clinical characteristics. 6) There is no specific antidote, therefore therapy is generally supportive. There were three deaths, and the cause of death was respiratory failure. 7) The most common complication was pneumonia, in 3 cases(10%), which occurred in almost all patients in the life-threatened group. Conclusions: The most common age group of poisoning was over 60 years old, and suicide was the most common cause of ingestion. Treatment is supportive, and most causal exposures require only decontamination. There were three deaths, and the cause of death was respiratory failure in each case. The most common complication was pneumonia.