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초음파의 음향밀도에 따른 디젤오염토양의 TPH 분해특성에 관한 연구
최호은 ( Ho-eun Choi ),정연화 ( Yon-hwa Jung ),김한석 ( Han-suk Kim ),김대용 ( Dae-yong Kim ),정병길 ( Byung-gil Jung ) 한국환경기술학회 2007 한국환경기술학회지 Vol.8 No.4
본 연구에서는 초음파 음향밀도에 따른 디젤오염토양의 TPH의 분해특성을 평가하고자 하였다. 실험은 토양 1 kg에 디젤을 주입하여 TPH 농도를 약 10,000 mg THP/kg soil로 오염시켜 사용하였다. 초음파 조사 후 토양 중에 남아 있는 TPH 농도를 GC를 이용하여 분석하였다. 실험결과 초음파의 조사강도가 클수록, 오염토양의 양이 많을수록 TPH 농도 감소가 크게 나타났다. 또한 디젤오염 토양에 대하여 초음파를 60분간 조사시 TPH 농도변화는 음향밀도 50 W/L의 경우 9,556 mg TPH/kg soil에서 1,254 mg TPH/kg soil로 감소하였고, 음향밀도 70 W/L의 경우 9,856 mg TPH/kg soil에서 965 mg TPH/kg soil로 음향밀도 90 W/L의 경우 9,532 mg TPH/kg soil에서 733 mg TPH/kg soil로 각각 감소하는 것으로 나타났다. 디젤오염토양에 대한 초음파 조사시 TPH 제거효율은 음향밀도 90 W/L와 토양과 물의 혼합비율을 5:5로 하였을 경우 가장 높은 92.3%를 나타내었다. The objective of this study was to evaluate the degradation characteristics of the total petroleum hydrocarbons (TPHs) from artificially diesel-contaminated soil by means of the ultrasound acoustic density. The experiments were carried out with diesel fuel. A total of 1 kg of soil was artificially contaminated by approximately 10,000 mg of TPHs. The amounts of remaining TPHs in the treated soil were analyzed using a gas chromatography (GC).The removal efficiency of TPHs in the soil increased when the higher ultrasound intensity and the larger amounts of contaminated soil were used. In addition, the degrees of the degradation were carried out at constant ultrasound time of 60 min with different an acoustic densities. The most significant information of these were the following: 9,556 mg TPH/kg soil was decreased up to 1,254 mg TPH/kg soil at an acoustic density of 50 W/L. 9,856 mg TPH/kg soil was decreased up to 965 mg TPH/kg soil at an acoustic density of 70 W/L. 9,532 mg TPH/kg soil was decreased up to 733 mg TPH/kg soil at an acoustic density of 90 W/L. The result of this study showed that the highest removal efficiency (92.3%) of TPH in the soil was observed when an acoustic density of 90 W/L, and at a 5:5 soil to water ratio (w/w) were applied in this research.
유류오염토양 처리를 위한 마이크로나노버블 토양세척에 관한 연구
최호은 ( Ho Eun Choi ),정진희 ( Jin Hee Jung ),한영립 ( Young Rip Han ),김대용 ( Dae Yong Kim ),정병길 ( Byung Gil Jung ),최영익 ( Young Ik Choi ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.10
The objectives of this study are to examine the processing of oils contamination soil by means of using a micronano- bubble soil washing system, to investigate the various factors such as washing periods, the amount of micro- nano bubbles generated depending on the quantity of acid injection and quantity of air injection, to examine the features involved in the elimination of total petroleum hydrocarbons (TPHs) contained in the soil, and thus to evaluate the possibility of practical application on the field for the economic feasibility. The oils contaminated soil used in this study was collected from the 0~15 cm surface layer of an automobile junkyard located in U City. The collected soil was air-dried for 24 hours, and then the large particles and other substances contained in the soil were eliminated and filtered through sieve No.10 (2 mm) to secure consistency in the samples. The TPH concentration of the contaminated soil was found to be 4,914~5,998 mg/kg. The micronano-bubble soil washing system consists of the reactor, the flow equalization tank, the micronano- bubble generator, the pump and the strainer, and was manufactured with stainless material for withstanding acidic phase. When the injected air flow rate was fixed at 2 L/min, for each hydrogen peroxide concentrations (5, 10, 15%) the removal percents for TPH within the contaminated soil with retention times of 30 minutes were respectively identified as 4,931 mg/kg (18.9%), 4,678 mg/kg (18.9%) and, 4,513 mg/kg (17.7%). And when the injected air flow rate was fixed at 2 L/min, for each hydrogen peroxide concentrations (5, 10, 15%) the removal percents for TPH within the contaminated soil with retention times of 120 minutes were respectively identified as4,256 mg/kg (22.3%), 4,621 mg/kg (19.7%) and 4,268 mg/kg (25.9%).
마이크로나노버블 유입 공기유량 변화에 따른 TPH 제거효율 및 분해속도의 변화
최영익 ( Young-ik Choi ),최호은 ( Ho-eun Choi ),정진희 ( Jin-hee Jung ),정병길 ( Byung-gil Jung ) 한국환경기술학회 2016 한국환경기술학회지 Vol.17 No.5
본 연구는 마이크로나노버블 토양세척시스템을 이용한 TPH 처리 시 마이크로나노버블의 유입 공기유량의 변화에 따른 TPH 제거효율 및 분해속도의 변화를 알아보는 것에 그 목적이 있다. 이를 위해 5분, 10분, 20분, 30분, 60분 및 120분에 측정하였으며 TPH 잔량의 농도를 측정하여 제거율을 구하고 분해속도를 산출하였다. 실험에 사용된 오염토양은 U시에 위치하고 있는 폐차장에서 표층 0∼15 cm에서 채취한 중금속 오염토양을 사용하였으며 채취된 토양은 24시간 동안 풍건한 후 토양에 함유된 큰 입자와 기타물질을 제거하여 시료를 균등화하기 위해 No. 10(2 mm)을 이용하여 체거름 하였다. 운전조건은 마이크로나노버블 유입 공기유량을 1, 2 및 3 L/min으로 조정하여 120분 동안 처리하였다. 실험 결과 유입 공기유량이 1 L/min 일 때 TPH의 제거효율은 13.0% 및 분해속도는 0.7438, 2 L/min 일 때 TPH의 제거효율은 15.7% 및 분해속도는 0.7602, 3 L/min 일 때 TPH의 제거효율은 14.9% 및 분해속도는 0.6653로 나타났다. 이는 유입 공기유량이 2 L/min일 때 제거 효율이 높은 것으로 나타났다. This study aimed to look at how the removal efficiency and degradation rate for total petroleum hydrocarbons(TPH) change as different rates of air inflow are provided to micro-nano bubbles when a micro-nano bubble soil washing system is used to treat TPH. For these purposes, the initial and final concentrations of TPH were measured to calculate the TPH removal efficiency and degradation rate at 5, 10, 20, 30, 60, and 120 min into the experiment. Soil contaminated by heavy metals and extracted from 0-15 cm below the surface of a vehicle junkyard in the city of U was used in the experiment. The extracted soil was air-dried for 24 h, and then a No. 10 (2 mm) was used as a filter to remove large particles and other substances from the soil and to even out the samples. Regarding operational conditions, the air inflow rate into the micro-nano bubbles was adjusted to 1, 2, or 3 L/min, and treatment lasted for 120 min. The results showed that when the air inflow rate was 1 L/min, the TPH removal efficiency was 13.0% and the degradation rate was 0.7438. When the air inflow rate was 2 L/min, the TPH removal efficiency was 15.7% and the degradation rate was 0.7602. When the air inflow rate was 3 L/min, the TPH removal efficiency was 14.9% and the degradation rate was 0.6653. Therefore, the removal efficiency and degradation rate were highest when the air inflow rate was 2 L/min.
해수담수화를 위한 나노버블 침투형 복합 하이드로싸이클론 전처리 기술개발
문상욱 ( Sang-uook Moon ),최호은 ( Ho-eun Choi ),최영익 ( Young-ik Choi ),성낙창 ( Nak-chang Sung ),정병길 ( Byung-gil Jung ) 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.6
The purpose of this research was to develop a nanobubble multihydrocyclone pretreatment technology that supplies SDI (Silt Density Index) of below 3 in order as alternative to, and etc. the existing coagulation filtration pretreatment process in seawater desalination. The used seawater in this research was sampled at a depth of 5 m in the sea located in B City. The average water quality of seawater was found to be turbidity of 1.28 NTU, TDS 29,800 mg/L, hardness 3,330 mg/L as CaCO<sub>3</sub>, total colony counts 190 CFU/100 mL, total coliforms 1,400 CFU/100 mL, and SO<sub>4</sub> <sup>2-</sup> 1,890 mg/L. The nanobubble multi-hydrocyclone pretreatment process was consisted of a nanobubble generator, hydrocyclone, carbon filter, microfilter, RO pump, RO and UV systems. As a result of measuring (average of 5 times) the SDI of raw seawater, pretreated water, secondary treated water and final effluent were found to be 5.74, 3.42, 2.88 and 0.27, respectively. It was satisfied the SDI standard value of below 5 for seawater desalination pretreatment process. As a result of an economic evaluation for the coagulation sedimentation filtration process, the direct coagulation filtration process and the nanobubble multihydrocyclone process, which are the pretreatment processes for seawater desalination, the production cost per ton were 4,850 Won/m<sup>3</sup>, 4,528 Won/m<sup>3</sup>, and 3,821 Won/m<sup>3</sup>, respectively. Therefore, it was found that the nanobubble multi-hydrocyclone pretreatment process reduces operating costs by about 21 % compared to other pretreatment processes.
마이크로나노버블 토양세척시스템 및 산세척 복합공정의 산 농도변화에 따른 중금속 제거효율에 관한 연구
정진희 ( Jin-hee Jung ),최호은 ( Ho-eun Choi ),정병길 ( Byung-gil Jung ),성낙창 ( Nak-chang Sung ),이기철 ( Gi-chul Yi ),최영익 ( Young-ik Choi ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.1
This study was aimed at determining the changes in heavy metal removal efficiency at different acid concentrations in a micro-nanobubble soil washing system and pickling process that is used to dispose of heavy metals. For this purpose, the initial and final heavy metal concentrations were measured to calculate the heavy metal removal efficiency 5, 10, 20, 30, 60, and 120 min into the experiment. Soil contaminated by heavy metals and extracted from 0~15 cm below the surface of a vehicle junkyard in the city of U was used in the experiment. The extracted soil was air-dried for 24 h, after which a No. 10 (2 mm) was used as a filter to remove large particles and other substances from the soil as well as to even out the samples. As for the operating conditions, the air inflow rate in the micro-nano bubble soil washing system was fixed at 2 L/min,; with the concentration of hydrogen peroxide being adjusted to 5%, 10%, or 15%. The treatment lasted 120 min. The results showed that when the concentration of hydrogen peroxide was 5%, the efficiency of Zn removal was 27.4%, whereas those of Ni and Pb were 28.7% and 22.8%, respectively. When the concentration of hydrogen peroxide was 10%, the efficiency of Zn removal was 38.7%, whereas those of Ni and Pb were 42.6% and 28.6%, respectively. When the concentration of hydrogen peroxide was 15%, the efficiency of Zn removal was 49.7%, whereas those of Ni and Pb were 57.1% and 42.6%, respectively. Therefore, the efficiency of removal of all three heavy metals was the highest when the hydrogen peroxide concentration was 15%.