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전처리된 하수슬러지와 유기성폐기물의 통합소화를 위한 최적 혼합비율 연구
변병수 ( Byoung Su Byun ),이준상 ( Jun Sng Lee ),배종훈 ( Jong Hun Bae ),송용호 ( Yonh Hyo Song ),전항배 ( Jun Hang Bae ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.5
In this study, anaerobic co-digestion experiments for mixtures consisting of pre-treatment sewage sludge, food waste and livestock manure conducted to assess the methane yields and the volatile solids (VS) removal rates. simplex centroid design(SCD) was employed to design the mixing rate of organic wastes for the anaerobic co-digestion. presents the results of ANOVA conducted to assess the models of the cumulative methane yield and VS removal rates. The p-values verified the suitability of the model, where the model shows significance since the null hypothesis proves wrong if the p-value is less than 0.05. Three models-the linear, quadratic, and special cubic models-were considered. The p-values of the linear model were 0.012 (for cumulative methane yield) and 0.05 (for VS removal rate), which were both. From the regression analysis, co-digestion with sewage sludge, food waste, and livestock manure resulted a good synergy effect for accumulated methane production and VS decomposition rate. It was observed that incidence rate of sewage sludge was 61.7% and higher the mixing ratio of sewage sludge brought the better result. The optimal mixing ratio of sewage sludge, food waste, and livestock manure was found to be 61.3%, 28.6%, 10.1% as respectively.
권병수,변정미,이현주,정대훈,이태화,신경화,서동수,김기형 대한암학회 2019 Cancer Research and Treatment Vol.51 No.3
Purpose We investigated the clinical relevance and spectrum of BRCA1/2mutations in Korean ovarian cancer (KoOC) patients. Materials and Methods Two hundred seventy-nine KoOC patients were enrolled from three university hospitals between 2012 and 2017. Their peripheral blood samples were obtained for BRCA1/2 mutation analysis by direct sequencing. Clinicopathological characteristics were retrospectively reviewed, and spectrum analyses of BRCA1/2mutation were assessed by systematic literature review. Results Frequency of BRCA1/2mutations was 16.5% in KoOC patients. BRCA1/2mutations were significantly associated with family history of breast/ovarian cancer (p < 0.001), serous histology (p=0.044), and advanced International Federation of Gynecology and Obstetrics (FIGO) stage (III/IV, p=0.018) but not with early age-of-onset (age < 50, p=0.729). Literature review of BRCA1/2mutations in KoOC patients found 111 (55 distinct) mutations with high proportion of Korean-specific mutations (24/55, 43.6%). Comparing the spectrum of BRCA1/2 mutation between KoOC and Korean breast cancer (KoBC) patients, the ratio of BRCA1-to-BRCA2mutations was different, with BRCA1 (78.4%) being predominant in KoOC and BRCA2 in KoBC (59.2%). The most common mutation also differed between the two (c.3627insA of BRCA1 in KoOC and c.7480C>T of BRCA2 in KoBC). Conclusion The clinical relevance of BRCA1/2 mutations in KoOC patients was confirmed but that of early age-of-onset was not. Possible inconsistency in the ratio of BRCA1-to-BRCA2mutations and the most common mutation between KoOC and KoBC may probably suggest presence of mutation sequence-associated penetrance tendency in hereditary Korean breast and ovarian cancer. These data may provide insights for optimal genetic counseling and prophylactic treatment for at-risk relatives of KoOC patients.
이준상 ( Jun Sng Lee ),변병수 ( Byoung Su Byun ),배종훈 ( Jong Hun Bae ),이범 ( Yonh Hyo Song ),전항배 ( Hang Bae Jun ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.5
During denitrification volatile fatty acid was expected to be used as a carbon source, when NO3- was added into the methanogenic phase where glucose and volatile fatty acid were accumulated. In this study the effect of the addition of NO3- on the production of methane was investigated. Nitrogen oxides (NOx) were found to inhibit the methane production, however the process of denitrification and methane production occurred simultaneously. In addition if only NO3- and NO2- were co-existed, the process of methane production was discontinued. And when glucose and volatile fatty acid were compared as carbon substrate, there was significantly different only among the rates of decomposition of COD (organic matters) and NO3- and the production of methane. It has been observed that methanogenesis was progressed only after NO3--N was completely decomposed. Also as higher the concentration of NO3- was added, more organic matters were used for denitrification and it resulted the inhibition of methane production. In other words, at the initial stage of denitrification, the activity of denitrifying bacteria was dominant, however once NO3- was completely decomposed or once the denitrification was completed the methanogenic bacteria was appeared to be activated and overall the activity of denitrifying bacteria was dominant over the methanogenic bacteria.
UASB를 이용한 혐기성 하수처리공정에서 ABF 유출수 반송에 따른 유기물질과 질소 및 인 제거
전동걸(Dong Jie Tian),변병수(Byeong Su Byun),임현숙(Hyun Suk Lim),전항배(Hang Bae Jun) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.5
UASB-ABF (Up-flow anaerobic sludge blanket-aerated bio-filter) 시스템을 이용한 하수의 혐기성처리 방법에서 질소와 인을 제거하는 공법에 대하여 연구하였다. 160일간의 UASB-ABF 시스템을 운영한 결과 유출수 반송을 통하여 TCOD뿐만 아니라, TN과 TP를 효율적으로 제거할 수 있었다. 무반송의 경우 UASB 반응조에서 유기물 제거효율은 64%에 머물었으나, 반송률 120%, 180%, 240%로 증가한 결과 각각 92%, 95%, 96%로 향상되었다. 반송률 180% 이상에서는 유기물 제거효율 증가폭은 크지 않았다. ABF 유출수 반송으로 TN 제거효율이 크게 향상되었다. TN 제거효율은 무반송 조건일 때 18%에서 82%로 향상되었으며, UASB에서 지속적인 유기물질 제거로 인하여 ABF에서 질산화효율은 안정적으로 95% 이상으로 타나났다. ABF유출수 반송으로 TP 및 PO₄3- -P 제거효율이 모두 향상되었다. TP의 경우 무반송에서는 거의 제거되지 않았으나, 반송률이 120%, 180%, 240%에서는 각각 51%, 63%, 71%로 향상되었고, 주로 UASB에서 제거되었다. Nitrogen and phosphorus removal was investigated in an UASB-ABF (Up-flow anaerobic sludge blanket - aerated bio- filter) anaerobic sewage treatment system. Successful removal of nitrogen and phosphorus with organic matters was possible in the UASB-ABF system from the results of 160 days operation with the influent raw domestic sewage. Removal efficiencies of organic matter (as TCOD) showed 64% in UASB without recycle of the ABF effluent, however, they increased to 92%, 95%, 96% with 120%, 180% and 240% recycle of the ABF effluent, respectively. Increasement of the organic matter removal was not prominent at recycle ratio above 180%. Apparent increase in TN removal occurred with recycle of the ABF effluent. TN removal efficiency was 18% without recycle, but it increased to 82% with 240% recycle of the ABF effluent. And stable nitrification above 95% was possible as a result of efficient removal of organic matter in the UASB with and without recycle of the effluent. Removal of both TP and PO₄3- -P also increased remarkably with recycle of the effluent. Without recycle of the effluent, that is at strict anaerobic condition in UASB, TP was not removed, however, its removal efficiency increased to 51%, 63%, 71% at recycle ratios of 120%, 180%, 240%, respectively mainly at UASB.
알루미늄전극과 산화철 여과를 이용한 하수 방류수 내 인의 제거
전동걸 ( Dong Jie Tian ),임현숙 ( Hyun Sook Lim ),변병수 ( Byeong Su Byun ),전항배 ( Hang Bae Jun ) 충북대학교 건설기술연구소 2014 建設技術論文集 Vol.33 No.1
인은 하천, 호소의 부영영화의 주요한 영양소이다. 2013년부터 하수 방류수 내 인은 2.0mg/L에서 0.2mg/L로 강화된다. 따라서, 본 연구에서는 알루미늄전극과 산화철 여과지로 하수 방류수 내 인 제거 실험을 수행하였다. 최적인자 도출을 위한 다양한 회분식 실험은 인공폐수를 사용하여 수행하였다. 알루이늄전극 전기분해에 대한 최적 전압과 HRT는 유입 인 농도 0.5~2.0mg/L에서 각각 20V, 120sec이었다. 따라서, 이때의 인 제거효율은 97.3%이었다. 알루미늄전극 전기분해와 산화철 여과에 의한 실제 하수 방류수 연속 운전에서는 인 제거효율이 각각 82.9%, 87.3%이었다. 결과적으로 알루미늄전극 전기분해와 산화철 여과지에서 98%의 안정적인 인 제거로 하수 방류가 가능하였다. 이러한 조합인 제거 공정은 0.2mg/L의 배출기준을 만족하엿다. Phosphorus is an important nutrient causing the eutrophication which decreases the valuse of rivers, lakes and estuaries. From 2013, the sewage effluent standard of the phosphorus is planning to strengthen from 2.0mg/L to 0.2mg/L. In this paper, the alurninium electrode and oxidized iron filtration were tested for the removal of phosphorus in sewage effluent. Several batch tests were also performed using the artificial wastewater to find the optimum operating conditions. Optimal voltge and HRT(hydraulic retention time)for aluminium electroysis were 20V and 120sec at influent phosphorus of 0.6~2.0mg/L, respectively. In these conditions, the phosphorus removal efficiency was 97.3%. On the continuous operation of the aluminium electrolysis and oxidized iron filtration with actual sewage effluent the phosphorus removal efficiency were 82.9% and 87.3%, respectively. Finally, stable 98% phosphorus removal was possible from the effluent of sewage with both aluminium electrode and oxidized iron filtration. These combined phosphorus removal processes are suitable to meet the effluent standards, 0.2mg/L.