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소석회, 포틀랜드 시멘트, FeCl<sub>3</sub>·6H<sub>2</sub>O, NaOH를 이용한 비소 오염토양의 안정화
문덕현,오다연,이승제,박정훈,Moon, Deok-Hyun,Oh, Da-Yeon,Lee, Seung-Je,Park, Jeong-Hun 한국환경농학회 2010 한국환경농학회지 Vol.29 No.1
본 연구에서 비소로 오염된 토양에 함유된 비소를 안정화시키기 위하여 4종류의 안정화제를 이용 처리하여 다음과 같은 결론을 얻었다. 안정화 처리에 사용된 오염토는 약알칼리성을 띄고 있으며, 입도분포 결과 사토계열이였고 57.5%의 비소가 무정형 및 비결정형 철/알루미늄 수산화물형태로 존재했다. 안정화 실험 결과 소석회/포틀랜드시멘트 혼합 안정화처리가 모든 안정화 처리와 비교 했을 때 현저한 우의를 보였으며 총 함량 30%로 토양오염 우려기준 20 mg/kg('나'지역)을 통과 하였다. 소석회/$FeCl_3{\cdot}6H_2O$ 혼합 이용시 효율적인 비소 저감효과룹 기대할 수 없었으며 소석회/NaOH는 효과적이었으나 소석회/포틀랜드시멘트 보다는 효율성이 제한적 이였다. 소석회/포틀랜드시멘트 혼합 안정화 처리 후 연속추출결과는 처리 전 오염토와 비교했을 때 특이적 흡착과 잔류대의 증가를 보였다. 특히 25wt%+10wt% 처리 시료에서 잔류태의 증가는 2배가 넘어 (16%에서 35.7%) 매우 안정적인 비소 존재 형태를 보여 비소 용출농도 저감에 현저하게 기여한 것으로 판단된다. The purpose of this study was to investigate the effectiveness of a stabilization treatment for As contaminated soil. A combination of hydrated lime, Portland cement, $FeCl_3{\cdot}6H_2O$, and NaOH were used as stabilizing agents. The effectiveness of stabilization treatment was evaluated by the Korean Standard Test (KST) method (1N HCl extraction). Sequential extractions were performed to investigate the As distribution after treatment. Following the application of the treatment, curing periods of up to 7 and 28days were investigated. The experimental results showed that a combination of hydrated lime/Portland cement was more effective than treatments of hydrated lime or Portland cement at immobilizing As in the contaminated soil. The treatment of 25wt% hydrated lime and 5wt% Portland cement was effective in reducing As leachability less than the Korean warning standard of 20 mg/kg. However, the treatments of hydrated lime and Portland cement failed to meet the Korean warning standard even when up to 30 wt% was used. The treatment utilizing hydrated lime and $FeCl_3{\cdot}6H_2O$ was not effective in properly reducing As leachability. The addition of $FeCl_3{\cdot}6H_2O$ was negative in terms of pH condition. Moreover, the treatment with hydrated lime/NaOH was effective in reducing As leachability but not as much as hydrated lime/Portland cement. The sequential extraction results indicated that the residual phase was greatly increased upon the treatment of hydrated lime/Portland cement. It was concluded that the hydrated lime/Portland cement treatment was the best among the other combinations studied at achieving trace As concentrations.
제6주제 : Stabilization of lead (Pb) contaminated army firing range soils using waste oyster shells
문덕현(Deok Hyun Moon),정경훈(Kyung Hoon Cheong),김태성(Tae-Sung Kim),김지형(Jeehyeong Khim),최형일(Hyung-il Choi),최수빈(Su Bin Choi),문옥란(Ok Ran Moon),방선백(Sunbaek Bang) 대한환경위생공학회 2009 대한환경위생공학회 정기총회 및 학술발표회 Vol.2009 No.-
A stabilization technique was applied to immobilize lead (Pb) in contaminated soils obtained from army firing ranges using waste oyster shells. Both natural waste oyster shells (NOS) and pretreated oyster shells (POS) were used as the main stabilizing agents. The pas were roasted at a high temperature to activate quicklime from the calcite in the shells. The treatments were performed with two different particle sizes (2 ㎜ 0.853 ㎜) at a curing period of 8 days. Pb leaching tests from both NOS and pas stabilized soil samples cured for 28 days were evaluated using the Korean Standard Test (KST) method (01N Hel extraction). The treatment results using oyster shells of 2 ㎜ in size, after 28 days of curing, indicated that the pas treatment was more effective than the NOS treatment at stabilizing the Pb in the contaminated soils. All the NOS treatments failed to meet the Korean warning standard of 100 ㎎/㎏. However, less than 50 ㎎/㎏ of Pb leached (> 99% Pb reduction) from the 15 wt% and 20 wt% pas stabilized soils, after 28 days of curing. Moreover, the particle size reduction of NOS using the 0.853 ㎜ size showed better performance in reducing Pb leachability while the particle size reduction of pas showed no significant effects on the reduction of Pb leachability. Overall, it could be concluded that the pas treatment was significantly effective at immobilizing the Pb in the contaminated soils and the pas could be utilized as a cost effective stabilizing agent.
목재방부제(CCA) 오염토양의 소성가공 굴껍질을 이용한 비소 안정화
문덕현 ( Deok Hyun Moon ),정경훈 ( Kyung Hoon Cheong ),김태성 ( Tae Sung Kim ),김지형 ( Jee Hyeong Khim ),최수빈 ( Su Bin Choi ),문옥란 ( Ok Ran Moon ),옥용식 ( Yong Sik Ok ) 한국환경농학회 2009 한국환경농학회지 Vol.28 No.4
Arsenic (As) is known to be very toxic and carcinogenic to human beings. Arsenic contaminated soil was collected from a timber mill site at Busan Metropolitan City, Korea, where chromated copper arsenate (CCA) had been used to protect wood from rotting caused by insects and microbial agents. The soil was stabilized using both natural oyster shells (NOS) and calcinated oyster shells (POS). The calcination of natural oyster shells was accomplished at a high temperature in order to activate quicklime from calcite. Two different oyster shell particle sizes (-#10 mesh and -#20 mesh) and curing periods of up to 28 days were investigated. The stabilization effectiveness was evaluated based on the Korean Standard Test (KST) method (1N HCl extraction). The stabilization results showed that the POS treatment was more effective than the NOS treatment at immobilizing the As in the contaminated soils. A significant As reduction (96%) was attained upon a POS treatment at 20 wt% and passed the Korean warning standard of 20 mg/kg (`Na` area). However, an As reduction of only 47% (169 mg/kg) was achieved upon a NOS treatment at 20 wt%. The -#20 mesh oyster shells seem to perform better than the -#10 materials. The scanning electron microscopy (SEM)-energy dispersive X-ray spectroscopy (EDX) results showed that As immobilization was strongly associated with Ca and O in the presence of Al and Si.
Characterization and remediation of As, Cr and Pb contaminated soils
문덕현(Deok Hyun Moon),정경훈(Kyung Hoon Cheong),최형일(Hyung il Choi),박찬오(Chan Oh Park) 대한환경위생공학회 2008 대한환경위생공학회 정기총회 및 학술발표회 Vol.- No.-
In this presentation, the history of As, Cr and Pb contaminated soils is introduced. The characterization of contaminated soils, will be discussed, including geotechnical parameters, mineralogical/morphological data, and chemical soil analyses. A review of remediation techniques such as soil washing processes, phytoremediation, phosphate-induced Pb immobilization, and stabilization/solidification (S/S) processes are introduced and compared. The S/S process is carefully reviewed and the mechanism of immobilization for the S/S process is also demonstrated. Chromite ore processing residue (COPR) materials are discussed with reference to Cr contaminated soils, due to the similar processes that govern metals speciation and remediation. Two abstracts which highlightCKD treatment of As contaminated soils and the long-term evaluation of treated COPR materials are as follows:
소석회, 포틀랜드 시멘트, FeCl3,6H2O, NaOH를 이용한 비소 오염토양의 안정화
문덕현 ( Deok Hyun Moon ),오다연 ( Da Yeon Oh ),이승제 ( Seung Je Lee ),박정훈 ( Jeong Hun Park ) 한국환경농학회 2010 한국환경농학회지 Vol.29 No.1
The purpose of this study was to investigate the effectiveness of a stabilization treatment for As contaminated soil. A combination of hydrated lime, Portland cement, FeCl3·6H2O, and NaOH were used as stabilizing agents. The effectiveness of stabilization treatment was evaluated by the Korean Standard Test (KST) method (1N HCl extraction). Sequential extractions were performed to investigate the As distribution after treatment. Following the application of the treatment, curing periods of up to 7 and 28days were investigated. The experimental results showed that a combination of hydrated lime/Portland cement was more effective than treatments of hydrated lime or Portland cement at immobilizing As in the contaminated soil. The treatment of 25wt% hydrated lime and 5wt% Portland cement was effective in reducing As leachability less than the Korean warning standard of 20 mg/kg. However, the treatments of hydrated lime and Portland cement failed to meet the Korean warning standard even when up to 30 wt% was used. The treatment utilizing hydrated lime and FeCl3·6H2O was not effective in properly reducing As leachability. The addition of FeCl3·6H2O was negative in terms of pH condition. Moreover, the treatment with hydrated lime/NaOH was effective in reducing As leachability but not as much as hydrated lime/Portland cement. The sequential extraction results indicated that the residual phase was greatly increased upon the treatment of hydrated lime/Portland cement. It was concluded that the hydrated lime/Portland cement treatment was the best among the other combinations studied at achieving trace As concentrations.
광산지역 수은 오염토양 안정화를 위한 석탄광산배수슬러지의 적용성 평가
고일하,권요셉,문덕현,고주인,지원현,Koh, Il-Ha,Kwon, Yo Seb,Moon, Deok Hyun,Ko, Ju In,Ji, Won Hyun 한국지하수토양환경학회 2020 지하수토양환경 Vol.25 No.1
This study assessed the feasibility of coal mine drainage sludge (CMDS) as a stabilizing agent for mercury contaminated soil through pot experiments and batch tests. In the pot experiments with 43 days of lettuce growth, the bioavailability of mercury in the amended soil and mercury content of the lettuce were decreased by 46% and 50%, respectively. These results were similar to those of the soil amended with the sulfide compound (FeS) generally used for mercury stabilization. Thus, CMDS could be an attractive mercury stabilizer in terms of industrial by-product recycling. Batch tests were conducted to examine mercury fractionation including reactions between the soil and acetic acid. The result showed that some elemental fraction changed to strongly bounded fraction rather than residual (HgS) fraction. This made it possible to conclude that mercury adsorption on oxides in CMDS was the major mechanism of stabilization.