질산성 질소 제거를 위한 독립영양 황탈질 칼럼에서의 미생물 적응에 관한 연구

신도연,문희선,김재영,남경필,Shin, Do-Yun,Moon, Hee-Sun,Kim, Jae-Young,Nam, Kyoung-Phile 한국지하수토양환경학회 2006 지하수토양환경 Vol.11 No.2

Two sulfur-based column reactors inoculated with a bacterial consortium containing autotrophic denitrifiers were operated for 100 and 500 days, respectively and nitrate removal efficiency and the adaptation of microbial communities in the columns were monitored with column depths and time. For better understanding the adaptation phenomenon, molecular techniques including 16S rDNA sequencing and DGGE analysis were employed. Although both columns showed about 99% of nitrate removal efficiency heterotrophic denitrifiers such as Cenibacterium arsenioxidans and Geothrix fermentans were found to a significant portion at the initial stage of the 100-day reactor operation. However, as operation time increased, an autotrophic denitrifier Thiobacillus denitrificans became a dominant bacterial species throughout the column. A similar trend was also observed in the 500-day column. In addition, nitrate removal efficiencies were different with column depths and thus bacterial species with different metabolic activities were found at the corresponding depths. Especially, T. denitrificans was successfully adapted and colonized at the bottom parts of the columns where most nitrate was reduced.

사고 누출 화학물질 중 강산의 생산, 사용 현황 및 사고 사례 분석

신도연,문희선,윤윤열,윤욱,이윤호,하규철,현성필,Shin, Doyun,Moon, Hee Sun,Yoon, Yoon Yeol,Yun, Uk,Lee, Yunho,Ha, Kyoochul,Hyun, Sung Pil 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.6

We reviewed literature focusing on the amounts of domestic production, distribution, and consumption of strong acids and their spill cases. In particular, we investigated the chemistry and toxicity of four strong acids classified as "accident preparedness substances," including hydrochloric, nitric, sulfuric, and hydrofluoric acid. We recommend sulfuric and hydrofluoric acid as the chemicals of priority control based on the amounts used and toxicity. An advanced prevention/response system needs to be established along with an improved human and social infrastructure to prevent and efficiently respond to chemical accidents. Understanding the behavior and transport of spilled strong acids in the soil and groundwater environments requires a multi-disciplinary approach since they go through a variety of chemical and biogeochemical reactions with complex geomedia. However, no such research has been done in this area in Korea to the best of our knowledge. We expect the results of this study to contribute as basic data to future research.

국민건강보험공단 직원의 직무만족이 이직의도에 미치는 영향 - 자기효능감과 소진 매개효과 -

신도연 ( Shin Do Yeon ),곽종형 ( Kwak Jong Hyung ) 한국사회복지경영학회 2024 사회복지경영연구 Vol.11 No.2

This study is significant in that the major issues facing modern society, such as low birth rate and aging population, social conflict, selfishness, and extreme polarization of the gap between the rich and the poor, are fading etiquette and filial piety and leading to social problems. In this reality, even in the process of handling civil complaints by employees of the corporation, verbal abuse and threats from complainants occur, but employees are suffering from lack of response. Accordingly, it is expected that role conflict and emotional labor are connected to work, and that the burden due to work overload will also have an effect on turnover intention. At this point, the significance of this study is to investigate the characteristics of each variable, such as job satisfaction and turnover intention of employees of the corporation, and to examine the mediating effects of self-efficacy and burnout in the relationship between job satisfaction and turnover intention, and to verify the mediating effects, thereby studying whether there are ways to increase self-efficacy and reduce burnout and to devise countermeasures. The results of the hypothesis verification show that job satisfaction of employees of the corporation had a significant effect on turnover intention, self-efficacy, and burnout. In addition, self-efficacy and exhaustion had a significant effect on turnover intention, and there was also a mediating effect of self-efficacy and exhaustion on the relationship between job satisfaction and turnover intention.

Novel reconstructed reporter bacterium to quantitatively determine and visualize phenanthrene biodegradation and toxicity

Doyun Shin(신도연),Kyoungphile Nam(남경필) 한국환경독성학회 2010 한국독성학회 심포지움 및 학술발표회 Vol.2010 No.11

Soil Microbial Community Responses to Acid Exposure and Neutralization Treatments

Doyun Shin(신도연),Yunho Lee(이윤호),Jeonghyun Park(박정현),Hee Sun Moon(문희선),Sung Pil Hyun(현성필) 환경독성보건학회 2016 한국독성학회 심포지움 및 학술발표회 Vol.2016 No.6

도시광산 금속자원의 순환활용을 위한 바이오 습식제련

이재천,신도연,B.D. Pandey,유경근 한국자원공학회 2011 한국자원공학회지 Vol.48 No.3

저품위/난분해성 광물뿐만 아니라 도시광산으로부터 유용금속의 회수를 위한 유망기술의 하나로 바이오 습식제련이 떠오르고 있다. 세균, 균류(fungi) 그리고 고세균(archaea) 등의 미생물종들을 이용하여 도시광산으로부터 금속들을 추출하는 바이오 프로세싱의 응용은 전세계적으로 연구되고 있으며, 자원순환활용과 환경오염감소의 두 가지 목표를 만족하는 공정들이 개발되고 있다. 본 총설은 제련과 제조산업/화학과 석유화학 플랜트/전기도금 플랜트의 부산물, 전자폐기물/인쇄회로기판 그리고 폐전지 등과 같은 다양한 2차 자원의 바이오 프로세싱을 통한 금속 추출에 초점을 두고 있다. 최적조건에서 금속을 회수하기 위하여 미생물 배양을 통해 얻어진 변종을 사용하는 공정처리 방법론을 중점 서술하였으며 공정의 실용성뿐 아니라 메커니즘에 대해서도 논하였다. 대규모로 도시광산의 금속자원을 처리하는 바이오 습식제련기술이 없는 현황을 고려하여, 결론에서 적용 가능한 접근방법에 대하여 간략하게 언급하였다. Bio-hydrometallurgy is emerging as one of the most promising technologies to recover valuable metals from the urban mine as well as low grade/refractory ores. The applications of bio-processing to extract metals from urban mine in presence of microbial species comprising of bacteria, fungi and archaea are increasingly being explored world over and processes are being developed to meet the twin objectives of resource recycling and pollution mitigation. This review focuses on the extraction of metal values through the bio-processing of various secondary resources: byproducts of metallurgical and manufacturing industries/chemical and petrochemical plants/ electroplating plants, electronic wastes/printed circuit boards (e-wastes/PCBs) and used batteries, etc. Emphasis is given on the processing methodologies using the strains of microbial cultures for the recovery of metals under optimum conditions while discussing the mechanism of the process as much as it is practicable. In view of the non-utilization of the bio-hydrometallurgical technology to treat the metal resources in the urban mine for large scale production, the possible approaches are briefly mentioned in the conclusion.

특허(特許)와 논문(論文)으로 본 폐인쇄회로기판(廢印刷回路基板) 재활용(再活用) 기술(技術) 동향(動向)

정진기,신도연,김병수,조영주,조봉규,Jeong, Jin-Ki,Shin, Do-Yun,Kim, Byung-Su,Cho, Young-Ju,Cho, Bong-Gyoo 한국자원리싸이클링학회 2012 자원리싸이클링 Vol.21 No.3

일반적으로 인쇄회로기판(Printed Circuit Board, PCB)은 다양한 종류의 플라스틱에 세라믹과 금속 성분이 복합적으로 함유되어 있는 것으로 알려져 있다. 따라서 환경적인 보호뿐만 아니라 자원의 재활용의 관점에서 PCB 스크랩으로부터 금속 성분을 분리해내는 것은 중요하다. 본 연구에서는 PCB의 재활용 기술에 대한 특허와 논문을 분석하였다. 분석 범위는 1980년~2011년까지의 미국, 유럽연합, 일본, 한국 등 다양한 나라의 등록/공개된 특허와 SCI 논문으로 제한하였다. 특허와 논문은 키워드를 사용하여 수집하였고, 기술의 정의에 의해 필터링 하였다. 특허와 논문의 동향은 연도, 국가, 기업, 기술에 따라 분석하여 나타내었다.

사고 누출 화학물질의 지하수 및 토양 환경 내 거동 및 환경 독성 특성 II: 인화성 물질을 중심으로

조은혜,신도연 한국지하수토양환경학회 2018 지하수토양환경 Vol.23 No.6

In this study, formaldehyde and benzene were selected as the arbitrary chemicals in accidental leakage to environment, andtheir physicochemical and biological characteristics and toxicity were studied. Also, the fate of these chemicals in soil andgroundwater was studied based on the results of previous studies. They can be released into the atmosphere as gas or vaporphase, which then can be photochemically degraded. Since they have relatively high water solubility, they are likely to havehigh mobility in water and soil. Volatilization of these chemicals from soil is affected by the soil moisture content. Biodegradation of formaldehyde and benzene is one of the important pathways as well. Therefore, it is necessary to study theenvironmental impacts of leakage accidents of flammable chemicals such as formaldehyde and benzene. Further research onthe fate of flammable chemicals in the environment is needed to take appropriate response actions to leakage accidents offlammable chemicals, and this will contribute to the development of practical guidelines to cope with leakage accidents.

금 제련에 사용되는 시안의 사용, 규제 및 처리 현황

박정현,신도연,박현식,정진기,이재천,Park, Jeonghyun,Shin, Doyun,Park, Hyunsik,Jeong, Jinki,Lee, Jae-chun 한국자원리싸이클링학회 2015 자원리싸이클링 Vol.24 No.4

전세계적으로 시안화법은 일차 광물 혹은 정광으로부터 금을 회수하기 위해 널리 사용되어 왔다. 그러나 이 공정에서 발생하는 다량의 유독한 잔사 및 시안 함유 폐액은 주변 환경 및 생태계에 심각한 문제를 야기할 수 있어 그 사용에 대해 문제가 제기되어 왔으므로 시안화법 이용 시 반드시 시안 함유 폐액의 적절한 처리가 필요하다. 본 연구에서는 금광으로부터 금을 회수하기 위한 습식제련공정인 시안화법과 연계하여 시안 처리 공정을 설계하기 위한 기초연구로서 금 제련에 사용되는 시안화합물의 사용, 규제 및 처리 기술의 국내외 현황을 분석하였다. 또한 무배출 금 회수 및 처리 공정을 설계하기 위한 생물학적 공정에 대하여 소개하였다.

사고 누출 화학물질의 지하수 및 토양 환경 내 거동 및 환경 독성 특성 III: 유기화학물질을 중심으로

정슬기,문희선,신도연 한국지하수토양환경학회 2019 지하수토양환경 Vol.24 No.1

This study presents a technical perspective to the fate characteristics of phenol and m-cresol, which represent some of themost common organic chemicals found in chemical spill accidents, and likely to persist in soil and groundwater due totheir highly stable physicochemical properties. Some cases of domestic and foreign chemical accidents linked to phenoland m-cresol contamination were compiled. Due to their low organic carbon-water partitioning coefficient (Koc), phenoland m-cresol tend to migrate into groundwater and remained as dissolved phase. On the other hands, phenol and m-cresolcan be readily decomposed by microbes in soil and groundwater under appropriate conditions. Therefore, the fatecharacteristics of these chemicals are highly contingent on environmental conditions. Thus, if a great quantity of leakage isoccurred by chemical accidents, the up-to-date and correct information about fate characteristics taking into account boththe chemical and environmental conditions is greatly needed to minimized the potential hazards from these chemicals.