TCE 제거후 산화된 영가철 칼럼의 철환원균을 이용한 재생

채희훈,박재우,Naresh Singhal 대한환경공학회 2005 대한환경공학회 학술발표논문집 Vol.2005 No.12

유류/중금속 복합오염 퇴적토의 정화를 위한 산세척/펜톤/열탈착 복합 공정

채희훈,박재우 한국지하수토양환경학회 2025 지하수토양환경 Vol.30 No.1

The remediation of sediments contaminated with both total petroleum hydrocarbons (TPH) and heavy metals posessignificant environmental and health risks. This study explores a multi-step combined remediation approach using Fentonoxidation, thermal desorption, and acid washing to address such contamination. Each process was optimized individually. Acid washing efficiently removed heavy metals, meeting Dutch standards, but showed limited TPH removal. Fentonoxidation reduced TPH by 77%, though heavy metal removal was insufficient. Thermal desorption, however, successfullyeliminated TPH at temperatures above 300°C. Combining acid washing and thermal desorption achieved remediationtargets for both TPH and heavy metals, regardless of process order, meeting industrial standards. The treated sediment canbe safely reused as a resource, offering a sustainable solution for managing contaminated sediments. This integratedapproach demonstrates an effective method for remediating sediments contaminated by both TPH and heavy metals,addressing both environmental and economic challenges.

Shewanella algae BrY 를 이용한 영가철 칼럼의 TCE 처리 수명연장

채희훈,배연욱,박재우 한국지반환경공학회 2007 한국지반환경공학회논문집 Vol.8 No.2

Zevo-valent iron (ZVI) has been widely used in permeable reactive barriers for reducing organic contaminants, such as trichloroethylene (TCE). The rapid reaction time, however, leads to decrease in reactivity and availability of ZVI. Shewanella algae BrY, a strain of dissimilatory iron reducing bacteria, can reduce the oxidized Fe (III) to Fe (II) and reduced Fe (II) can be reused to reduce the contaminant. The effect of Shewanella algae BrY on the reduction of the oxidized ZVI column and further TCE removal in the contaminated groundwater were studied at different flow rates and TCE input concentrations in this study. High input concentration of TCE and flow rate increase the amount of input contaminant and make to lower the effect of reduction by Shewanella algae BrY. Specially, the fast flow rate inhibits the direct contact and implantation on the surface of iron. The reduction of oxidized iron reactive barrier by Shewanella algae BrY can decrease the decreation of duration of PRBs by the precipitation of oxidized iron produced by dechlorination of TCE.

철환원균 Shewanella algae BrY를 이용한 영가철 칼럼의 TCE 처리 수명연장

채희훈(Hee-Hun Chae),박재우(Jae-Woo Park) 한국지반환경공학회 2005 한국지반환경공학회 학술발표회논문집 Vol.2005 No.9

Mg-Cr 하이드로탈사이트 기반 흡착제의 이산화탄소 흡착 성능 향상 및 알칼리 금속염 함침 효과

차민규,채희훈,김홍석,안채은,이기봉 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.1

탈북민의 심리적 지원을 위한 집단상담 프로그램 스코핑 리뷰

김윤희,오성은,채희훈,임주희,신성만 한국콘텐츠학회 2023 한국콘텐츠학회논문지 Vol.23 No.11

This study analyzed 37 Korean literature on group counseling programs for North Korean defectors in South Korea through the scoping review method. Most programs were conducted during 2008-2012, mainly focused on adult defectors. Art therapy was the most common theory of the program, mainly developed on reducing negative emotions. Programs typically consisted of 10-15 sessions lasting 90-120 minutes each, with 5-10 participants. The results were classified by research method, program effectiveness, and limitations in program operation. With these results, we identified the necessity of multifaceted support for psychological difficulties, research for male defectors based on evidence-based theories as well as strength-based approaches, and the development of the small-scale modular group counseling program. In addition, in future studies, the establishment of a program direction according to the characteristics of research subjects, diversification of research effect measuring method, consideration of socio-demographic characteristics, and reflection of practitioner’s opinion when developing and operating the program will be needed.

응집탈수에 의한 고액분리식 전처리형 돈사폐수 처리기술

장정희,이교성,김종필,채희훈,한준경,김행수,조용완,곽노혁,편의식 대한환경공학회 2007 대한환경공학회 학술발표논문집 Vol.2007 No.12

SMR공정 배가스 내 CO₂ 포집 중 발생하는 응축수 처리 및 재이용 연구

곽민재(Min Jae Kwak),채희훈(Heehun Chae),한인섭(Ihnsup Han) 대한환경공학회 2022 대한환경공학회 학술발표논문집 Vol.2022 No.11

싱가포르 오염준설토 정화 후 생태 독성 변화

조은혜,윤성호,황선경,이성종,김홍석,채희훈,Jho, Eun Hea,Yun, Seong Ho,Hwang, Sun Kyung,Lee, Sung Jong,Kim, Hongseok,Chae, Heehun 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.5

Contaminated sediment can be treated in order to reuse the treated sediment. Even though the chemical criteria are satisfied, the treated sediment could still impose toxic effects. Therefore, this study investigated the changes in the ecological toxic effects of the contaminated sediment from the J region in Singapore after treatment. The contaminated sediment was subject to sequential soil washing and thermal treatment, followed by pH neutralization. Toxic effects of the contaminated and treated sediments were determined by using Vibrio fischeri ($Microtox^{(R)}$), Triticum aestivum (wheat), and Eisenia foetida (earthworm). After treatment, the concentrations of total petroleum hydrocarbons and heavy metals were decreased by 98% and 59-93%, respectively, and satisfied the Industrial Maximum Values of the Dutch Standard, which were used as the remedial goal. The bioluminescence reduction of V. fischeri decreased significantly, and the earthworm survival increased from 0% to 90% after treatment. The germination rate increased from $0{\pm}0%$ to $75{\pm}13%$ after treatment, but the treated sediment may need additional treatment such as nutrient addition for better plant growth. Overall, this study showed that the treatment of the contaminated sediment satisfactorily removed mixed contaminants, and this led to reduction in toxic effects, suggesting improved potentials for reuse of the treated sediment.

시멘트계 합성물질을 이용한 비소 오염 토양의 고형화/안정화

김란(Kim, Ran),홍성혁(Hong, Seong Hyeok),정방미(Jung, Bahng Mi),채희훈(Chae, Hee Hun),박주양(Park, Joo Yang) 한국지반환경공학회 2012 한국지반환경공학회논문집 Vol.13 No.2

본 연구에서는 비소 오염 토양의 비소 처리를 위해 고형화/안정화 공법을 적용하였으며, 4가지 종류의 바인더(시멘트, 영가철(Zero Valent iron, ZVI), monosulfate와 ettringite(시멘트계 합성물질))를 이용하였다. 1 N HCl 용출법을 통해 비교한 결과 바인더 함유량 20%에서, 시멘트(71.41%) > monosulfate(47.45%) > ettringite(46.36%) > 영가철(33.08%)의 비소가 용출되었다. 또한, 시멘트에 첨가제(monosulfate, ettringite, calcium sulfoaluminate, CSA)를 혼합하여 바인더를 제작하여 비소 저감 능력을 평가하였다. 1NHCl 용출법을 통해 비교한 결과 3가지 혼합바인더 모두 혼합비 4:1에서 최대의 비소농도 저감효과를 나타냈으며, CSA(86.27%) > monosulfate(84.78%) > ettringite(84.71%) > 시멘트(71.41%)의 비소를 안정화하여 기존의 시멘트만 단독으로 사용했을 경우보다 더 높은 비소(As(V)) 저감 능력을 가지고 있는 것으로 평가된다. Solidification/Stabilization(S/S) is one of the remediation technologies that have been applied for treating inorganic hazardous wastes. This study investigated the reduction of arsenic concentration of arsenic-contaminated soil using by S/S. The binder plays a role in controlling the mobility and solubility of the contaminants in S/S process, so it is important to determine the optimum binder content. Therefore, this study evaluated the effectiveness of S/S using four different binders(cement, zero valent iron, and monosulfate and ettringite(cement-based synthesized materials) at the binder content ranged between 5%(wt.) and 20%(wt.). The leachability of arsenic in 1 N HCl was different depending on the types of binders: cement(71.41%) > monosulfate(47.45%) > ettringite(46.36%) > ZVI(33.08%) at the binder content of 20%. Additionally, three kinds of a mixture binder were prepared using cement and additives(monosulfate, ettringite, calcium sulfoaluminate(CSA)) and tested for arsenic reduction. The highest arsenic removal capacity was found at the mass ratio of cement to the additive, 4:1 in all experiments using a mixture binder, regardless of the additives types. A mixture binder(cement and additives) resulted in higher arsenic removal relative to the arsenic removal when cement was used alone.