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현장토양내 다환방향족탄화수소 저감을 위한 과산소산 산화효율 평가
정상락 ( Sang-rak Jung ),장윤영 ( Yoon-young Chang ) 한국환경영향평가학회 2021 환경영향평가 Vol.30 No.2
과산소산(peroxy-acid)을 산화제로 사용하여 현장 오염토양내 존재하는 다환방향족탄화수소의 산화분해 효과를 알아보기 위하여 실험실 규모의 연구를 진행하였다. 대상 토양의 토성은 19.2 %의 토양 유기물을 포함한 pH 6.8의 사양토(sandy loam)로 확인되었으며 토양 내 다환방향족탄화수소 중 벤조(a)피렌(benzo(a)pyrene)의 농도가 평균 2.23 mg/kg으로 국내 토양환경보전법의 1 지역 우려 기준치의 3배 정도높게 나타났다. 따라서 벤조(a)피렌 오염 토양에 대하여 유기산과 과산화수소를 이용한 과산소산 산화(peroxy-acid oxidation)처리에 의한 토양내 벤조(a)피렌의 농도 저감효과를 유기산의 종류와 유기산 및 과산화수소의 농도조건별로 평가하였다. 선정된 유기산 중 프로피온산(propionic acid)의 산화 효과가 가장 큰 것으로 확인되었으며 토양 중 벤조(a)피렌의 농도를 최종적으로 1 지역 우려 기준치 이하로 저감하였다. Laboratory-scale experiments were conducted to assess the effect of oxidative decomposition of polycyclic aromatic hydrocarbons (PAHs) in field soil using peroxy-acid. The study soil texture is sandy soil containing 19.2 % of organic matter at pH 6.8. Among polycyclic aromatic hydrocarbons (PAHs) in the study soil, the concentration of benzo(a)pyrene is 2.23 mg/kg which is three times higher than the Korea standard level. Therefore benzo(a)pyrene was selected as the target study PAH for the treatment by peroxy-acid oxidation using peroxy-acid coupled with hydrogen peroxide, and the efficiency of the oxidative decomposition of benzo(a)pyrene was assessed for the different organic acids and dosages of an organic acid and hydrogen peroxide. Propionic acid among the tested organic acids showed the highest efficiency of benzo(a)pyrene reduction in the peroxyacid oxidation treatment and finally satisfied the Korea standard level.
전방 접근 제 5 요추-제 1 천추간 융합술;복강경과 최소 개복 전방 추체간 융합술의 비교연구
정상기,이상호,임상락 대한신경외과학회 2003 Journal of Korean neurosurgical society Vol.33 No.2
Objective:To investigate the effectiveness and safety of the laparoscopic L5-S1 fusion, its perioperative parameters and long-term outcome are compared with those of open anterior surgical approach. Methods:Data of 54 consecutive patients who underwent anterior approach for L5-S1 fusion either by laparoscopic or open mini-anterior lumbar interbody fusion(ALIF) from 1997 to 1999 were analyzed. Among them, 47 cases were available with more than 2-years follow-up data. In all cases, carbon cage and autologous bone graft were used. Results:Twenty five patients underwent a laparoscopic procedure and twenty two a open mini-ALIF. Three laparoscopic procedures were converted to open ones. For perioperative parameter, only the operative time was statistically different(p=0.001)while length of postoperative hospital stay and blood loss were not. The incidence of operative complication was three in laparoscopic group and two in open mini-ALIF group. After the follow-up of at least two years, the two groups showed no statistical difference in visual analog scale for pain, Oswestry disability index, and patient satisfaction index. The fusion rate was 91% in each group. Conclusion:The findings of this study suggest that laparoscopic ALIF has similar effectiveness and safety with open mini-ALIF. However, the advantage of laparoscopic approach as a minimally invasive surgery should be reconsidered because no objective additional benefit was found. Key words:Laparoscopic ALIF;L5-S1 fusion;Carbon cage.
신정남,노성혁,정상락,오길록,김미경,육운수,Shin, Joung-Nam,Roh, Sung-Hyeuk,Jung, Sang-Rak,Oh, Gil-Rok,Kim, Mi-Kyoung,Yook, Woon-Soo 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.6
The BTEX contamination of soil around gas station in Korea was investigated in 53 gas stations in 2013 by official test method on soil pollution. Each gas station was divided into oil tank area, line area, and surrounding area. The concentration of BTEX in 1066 sites of 53 gas stations was N.D.~ 3437.36 mg/kg. The order of average concentration for area was as follows: line area ($20.91{\pm}144.79mg/kg$) > tank area ($15.11{\pm}110.08mg/kg$) > surrounding area ($10.79{\pm}111.40mg/kg$). It was the number of sampling site exceeding regulatory levels at surrounding area the most at all. The average concentration of xylene was the highest, while that of ethylbenzene was the lowest.