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Removal Kinetics of Microcystins and Algal Biomass by Non- Thermal Plasma Oxidation
( Rumi Park ),( Hyunmin An ),( Jong-guk Kim ),( Hyun-woo Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
Cyanobacterial toxin, microcystins, associated with microalgal blooms may cause risk to the ecosystem including livestock and human. In this study, the removal efficiency of microcystins and biomass was evaluated using non-thermal plasma technology, one of the advanced oxidation processes. The most frequently detected microcystin-LR, -RR and -YR were determined as indicators of the major algal toxins. Under the defined experimental conditions, organics as chemical oxygen demand was removed by 26.7% for 24 hours and biomass removal as volatile suspended solids was as high as 32.1%. During the reaction, the result of scanning electron microscope evidences that the non-thermal plasma can destroy microalgal cell walls effectively and make the microcystin inside the cell released to the outside of the cell. The determination results demonstrate the increase of microcystin-LR and -YR though microcystin-RR was decreased by 34.2%. The total microcystins were removed by 30.9% during the operation. We newly suggested a model equation considering the microcystin release during the cell destruction. The microcystin degradation rate and release rate were estimated to be 8.604 d<sup>-1</sup> and 0.369 d<sup>-1</sup>, respectively, as a result of regression analysis. This study may contribute to predict the variability of microcystin removal depending on the existence of algae cells. A comparison with other studies further supports the applicability of the non-thermal plasma technology for the effective control of algal bloom and its toxicity.
( Rumi Park ),( Hyunmin An ),( Jae-cheol Lee ),( Hyun-woo Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
The development of the livestock industry has led to an increase in livestock wastewater production containing high nutrients concentration. Many researchers have tested various treatment technologies for livestock wastewater, but technical limitations still exist. To overcome the limitations, membrane photobioreactors (MPBR) have been studied as one of the promising technologies. MPBR can effectively recover nutrients from livestock wastewater while producing biomass resources; however, its performance may decline due to the high-turbidity of livestock wastewater causing growth inhibition of microalgae and light scattering in MPBR. To solve this problem, we coupled non-thermal plasma (NTP) technology with MPBR as a pretreatment. NTP technology has strong oxidizing power by producing reactive species such as O3, OH radical, H2O2, etc. In this study, we evaluated the effects of NTP pretreatment on overall MPBR performance. MPBR, equipped with MF (nominal pore size 0.5 ㎛) membrane, was inoculated with Scenedesmus obliquus . The working volume of NTP and MPBR were 4 L and 3 L, respectively. Flow rate and total hydraulic retention time of the coupled system were set to 0.5 L/day and 14 days. As a result, turbidity removal in NTP was 93.6% (3,882 NTU to 248 NTU). Pretreated livestock wastewater made the microalgal concentration of MPBR increased up to 1,944 mg D.W./L. The removal efficiency of the total nitrogen was 71% (755 mg N/L to 212 mg N/L) in NTP and 88% (212 mg N/L to 90 mg N/L) in MPBR. In the case of total phosphorus, decreased from the influent concentration of 106 mg P/L to the final effluent concentration of <2 mg P/L. System treatment efficiencies for total suspended solids (TSS), total chemical oxygen demand (TCOD), and dissolved chemical oxygen demand (SCOD) were commonly higher than 80%. This convergence process proposed in this study demonstrates better potential then conventional works treating nutrients as well as organic solids causing turbidity in livestock wastewater.
Rumi Shin,Seongdae Lee,Kyung-Su Han,Dae Kyung Sohn,Sang Hui Moon,Dong Hyun Choi,Bong-Hyeon Kye,Hae-Jung Son,Sun Il Lee,Sumin Si,Won-Kyung Kang 대한외과학회 2021 Annals of Surgical Treatment and Research(ASRT) Vol.100 No.3
Purpose: Colonoscopy is an effective method of screening for colorectal cancer (CRC), and it can prevent CRC by detection and removal of precancerous lesions. The most important considerations when performing colonoscopy screening are the safety and satisfaction of the patient and the diagnostic accuracy. Accordingly, the Korean Society of Coloproctology (KSCP) herein proposes an optimal level of standard performance to be used in endoscopy units and by individual colonoscopists for screening colonoscopy. These guidelines establish specific criteria for assessment of safety and quality in screening colonoscopy. Methods: The Colonoscopy Committee of the KSCP commissioned this Position Statement. Expert gastrointestinal surgeons representing the KSCP reviewed the published evidence to identify acceptable quality indicators and indicators that lacked sufficient evidence. Results: The KSCP recommends an optimal standard list for quality control of screening colonoscopy in the following 6 categories: training and competency of the colonoscopist, procedural quality, facilities and equipment, performance indicators and auditable outcomes, disinfection of equipment, and sedation and recovery of the patient. Conclusion: The KSCP recommends that endoscopy units performing CRC screening evaluate 6 key performance measures during daily practice.
저온플라즈마를 통한 도축폐수 처리 시 헤모글로빈 내 철에 의한 SCO/SCR 촉매반응 기반 질소 제거
박루미 ( Rumi Park ),이재철 ( Jae-cheol Lee ),이동관 ( Donggwan Lee ),이인호 ( In-ho Lee ),김현우 ( Hyun-woo Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 추계학술발표논문집 Vol.2018 No.-
저온플라즈마(non-thermal plasma)는 advanced oxidation processes (AOPs)중 하나로 강력한 산화력을 지니는 다양한 라디칼 및 산화종을 생산하여 난분해성 유기물 처리에 초점을 맞추어 연구가 진행되어왔다. 저온 플라즈마를 사용하여 도축폐수를 처리하는 과정에서 일정부분 질소가 제거되는 결과를 얻었으나 제거메커니즘에 대한 규명은 지금까지 불명확하게 제시되어왔다. 도축폐수 내에는 가축의 혈액을 주요 성분으로 포함하고 있어 단백질과 함께 철 이온이 다량 함유되어있다. SCO (selective catalytic oxidation) 및 SCR (selective catalytic reduction) 반응은 Fe<sub>2</sub>O<sub>3</sub> 또는 철 및 다른 금속을 포함한 촉매에 의해 일어나는 암모니아의 산화·촉매 반응이다. 두 반응을 통해 암모니아를 N<sub>2</sub>가스로 제거 가능하다는 가설 하에 본 연구는 저온 플라즈마를 이용한 암모니아 및 NOx의 제거 가설을 입증하는 실험적 결과를 제시한다. 실험 폐수는 H사의 도축폐수 유출수를 사용하였으며, batch 실험을 수행하였고 반응조 부피는 1.5 L, 공기 유량은 2 L/min으로 설정하였다. Gas sampling bag을 이용하여 반응조에서 유출되는 가스를 샘플링하여 가스 검출기(Kitagawa)를 통해 암모니아 가스 농도를 측정하였다. 저온플라즈마를 연결시킨 도축폐수 반응조를 24시간동안 운전한 결과 저온 플라즈마 반응조에서는 총 질소는 31.3 %, 암모니아성 질소는 48.2 % 감소되었다. 24시간동안 제거된 암모니아 가스에 대한 질소량은 32.5 mg으로 전체 제거 질소량 (300 mg N)에 약 10 %에 불과한 양이었다. 또한 존재하는 질소는 대부분 암모니아성 질소의 형태로 제거되었다. 따라서 제거된 암모니아성 질소는 암모늄 이온이 산화되어 NH<sub>3</sub>, 혹은 NOx가 아닌 N<sub>2</sub>로서 외부로 유출되었을 것으로 추측되며 이는 도축폐수 내 존재하는 다량의 철산화물 또는 다른 촉매 작용을 하는 매개체에 의한 선택적 산화 반응으로 보인다. 사사: 본 연구는 2018년도 정부(미래창조과학부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. (NRF-2017R1A2B4012762) 또한 이 연구는 2016년도 정부(환경부)의 재원으로 한국환경산업기술원의 지원을 받아 수행된 연구임(No.2016000140002).
Depth of mesorectal extension has prognostic significance in patients with T3 rectal cancer.
Shin, Rumi,Jeong, Seung-Yong,Yoo, Hong Yeol,Park, Kyu Joo,Heo, Seung Chul,Kang, Gyeong Hoon,Kim, Woo Ho,Park, Jae-Gahb Lippincott 2012 Diseases of the colon and rectum Vol.55 No.12
<P>More than half of all rectal cancers are T3 lesions, but they are classified as a single-stage category.</P>