대동맥주위 임파절을 침범한 간문부담도암에서 수술후 10년 무병생존 1예 보고

정동환,이승규,이영주,박광민,황신,김기훈,안철수,문덕복,하태용,정재필,송기원,김동식,김범수,문기명 대한외과학회 2005 대한외과학회 학술대회 초록집 Vol.2005 No.10

[고찰과 연구] 문자생활과 한글(1)

정동환 길림성민족사무위원회 1996 중국조선어문 Vol.86 No.-

우수유출수 처리에 따른 오염물질 삭감효과 평가방법

정동환,강형석,류덕희,정동일 대한환경공학회 2007 대한환경공학회 학술발표논문집 Vol.2007 No.12

도시지역 강우유출수에서 비점원 오염물질 EMC 분석

정동환,신동석,류덕희,정동일 대한환경공학회 2007 대한환경공학회 학술발표논문집 Vol.2007 No.12

디지털 퀵 줌과 친절한 언어구조의 비주얼 스캔들

정동환 한국방송학회 2010 한국방송학회 학술대회 논문집 Vol.2010 No.11

하수처리시설에서 총유기탄소(TOC) 처리를 위한 운영·관리 고찰

정동환,정현미,조양석,김은석,김창수,박준원,이원석 대한상하수도학회 2018 상하수도학회지 Vol.32 No.6

Total organic carbon (TOC) will replace chemical oxygen demand (CODMn) as an effluent water quality standard in public sewage treatment works (PSTWs) from 2021 in Korea. To ensure effective control of TOC in the effluent, investigation was carried out into TOC levels and sewage treatment operation factors in five target PSTWs using anaerobic-anoxic-aerobic (A2O) processes, media, membrane, and sequencing batch reactor (SBR) technologies. TOC removal efficiencies appeared to be 93-96% on average. As a fraction of TOC, biodegradable dissolved organic carbon (BDOC) was reduced from 64% in the influent to 9% in the effluent in these PSTWs. During the investigation, biological treatment processes were applied flexibly for operation factors such as HRT, SRT, MLSS, F/M ratios and BOD volume loads, based on the influent characteristics and design conditions. As a result, we suggest efficient operating conditions in PSTWs by evaluating relationships between TOC removal and operation factors.

국내․외 연구사례를 통해 본 하수처리시설 미세플라스틱 배출특성 및 관리방안 고찰

정동환,주병규,이원석,정현미,박준원,김창수 대한상하수도학회 2018 상하수도학회지 Vol.32 No.4

As the issue of microplastics (MPs) detection in tap water was raised in other countries in 2017, monitoring of MPs in drinking and source water, and sewage treatment plant (STP) effluents was initiated. This study intends to look into other studies on MPs in STPs at home and abroad, and review the characteristics of MPs and their removal efficiencies in the STPs, the risk and effect of MPs on watersheds, and management practices in order to help better understand MPs in STPs. To manage MPs effectively in STPs, it is necessary to investigate the detection of MPs discharged from STPs, do research on human health risk and control measures, and build a monitoring system including standardized analytical methods.

국내·외 하수도시설 미량유기물질의 발생 특성 및 관리체계에 대한 이해

정동환,함상이,이원석,정현미,김현욱,Jeong, Dong-Hwan,Ham, Sang-Yee,Lee, Wonseok,Chung, Hyenmi,Kim, Hyunook 대한상하수도학회 2017 상하수도학회지 Vol.31 No.6

As the modern society is rapidly developing and people become affluent in materials, many new chemical compounds in different forms of products (e.g., antibiotics, pesticides, detergents, personal care products and plastic goods) are produced, used, and disposed of to the environments. Some of them are persistently having a harmful impact on the environment and mimicking endocrine properties; in general they are present in the environment at low concentrations, so they are called organic pollutants. These organic micropollutants flow to sewage treatment plants via different routes. In this study, the generation characteristics, exposure pathways, detection levels, and environmental impacts of organic micropollutants were critically reviewed. In addition, currently available risk assessment methods and management systems for the compounds were reviewed. The United States Environmental Protection Agency (US EPA), for example, has monitored organic micropollutants and set the monitoring and management of some of the compounds as a priority. To effectively manage organic micropollutants in sewer systems, therefore, we should first monitor organic micropollutants of potential concern and then make a watch list of specific substances systematically, as described in guidelines on listing water pollutants in industrial wastewater.

춘천시 공공하수처리시설의 방류수가 의암호 수질에 미치는 영향 고찰

정동환,조양석,최인철,안경희,정현미,권오상 한국환경영향평가학회 2014 환경영향평가 Vol.23 No.5

2011년말 저·갈수기 북한강수계에서 수돗물 이취미 발생의 한 원인으로 의암호에서 조류 발생에 영양염류의 과다와 기상요인에 의한 것으로 보고 있으며, 특히 춘천지역의 생활하수에서 기인하는 영양염류를 중심으로 춘천시 공공하수처리시설의 방류수에서 배출하는 영양염류의 기여율 및 의암호 조류발생과의 관계를 살펴보고 그 영향을 분석하고자 하였다. 의암호 수체 내 영양염류가 부영양화 수준으로 이미 존재하고 있고, 겨울철임에도 체류시간, 수온 등환경요인은 조류 성장에 적합한 여건을 갖추고 있다. 의암호 수계에서 인처리시설 도입으로 하수처리장의총인 부하량은 약 43% 저감하였고, 의암호 조류 농도(Chlorophyll-a)는 약 7% 정도 개선되었다. 반면,인처리시설 도입에 따른 하수처리장의 질소 처리효율에는 거의 변화가 없는 것으로 나타났다. 이러한 문제를 좀더 효율적으로 해결하기 위해서는 의암호 상류지역에 대한 유역관리 대책을 수립하는것이 필요하며, 춘천지역 하수처리장의 질소 처리를 위한 운영·관리 개선 방안을 마련하는 것이 필요하다고 판단되었다. When abnormal taste and odor were detected in the tap water of the North-Han riverwatershed during the dry season in late 2011, excessive nutrients with algal growth in the LakeUiam and weather factors were considered to be among its causes. The nutrients, in particular,originated from domestic sewage in the Chuncheon area. This study was conducted to investigaterelations between the algal growth in the Lake Uiam and the contribution of nutrients from publicsewage treatment works (PSTWs) in Chuncheon city, and based on this to analyze the environmentalimpact. Nutrients in the Lake Uiam have already been accumulated to the level of eutrophication. Even in winter, the conditions in the lake such as retention time and water temperature were favorable to boost algal growth. After phosphorus treatment processes were introduced, the PSTWs in the Lake Uiam watershed were able to reduce the total phosphorus loads by 43%. The algal concentrations in the Lake Uiam also dropped by about 7%. The nitrogen treatment efficiencies in the PSTWs, on the other hand, remained almost the same after the introduction of the phosphorus treatment processes. To solve these problems more efficiently, it is necessary to develop management strategies for the upstream area of the Lake Uiam and set plans to improve nitrogen treatment operation and management for the PSTWs in Chuncheon.

유역하수도 공공하수처리시설의 방류수 수질 준수농도 설정방안 연구: 진위천 수계를 중심으로

정동환,조양석,김영석,안경희,정현미,권오상 대한상하수도학회 2015 상하수도학회지 Vol.29 No.4

In accordance with the Watershed Sewer System Maintenance Plan enforced on February 2, 2013, the different compliance concentration of effluent limit be applied to effluent discharged from public sewage treatment works(PSTWs) in each watershed on the basis of water quality thereof. With the introduction of watershed sewer system, it is necessary to set the compliance concentration of effluent limit for PSTWs situated in the watershed, by region and PSTW size, to achieve water quality criteria for regional watersheds or target water quality under TMDL program. Watershed Environmental Agencies establish the Watershed Sewer System Maintenance Plan and set the compliance concentrations of effluent limit for PSTWs under the plan. The agencies plan to apply tougher effluent BOD concentration limits in Class Ⅰ to Ⅳ areas. Effluent BOD concentration limits will be toughened from 5~10 mg/L to 3 mg/L in class Ⅱ~Ⅲ areas, from 10mg/L to 5mg/L in class Ⅳ areas. Uniform application of effluent BOD concentration limits to PSTWs in the watershed sewer system need to be complemented considering type of sewage treatment technology employed and watershed characteristics. Therefore, this study presents method to determine the compliance concentration of effluent limit from PSTWs in the watershed.