인회석 및 생선뼈를 이용한 일광광산 AMD 처리 현장실험

최정찬,Choi, Jung-Chan 대한자원환경지질학회 2005 자원환경지질 Vol.38 No.5

The purposes of this study are to examine a field test on heavy metal removal efficiency for AMD(Acid Mine Drainage) using fish bone and apatite, and to compare those results of the laboratory & the field tests. The duration of the field test was about one month and flow rates of AMD varied from 2.53 l/min to 12.8 l/min. From the result of the field test, removal efficiencies of apatite and those of fish bone are high for As, Fe, and Pb while those of fish born is higher than those of apatite far Al, Cd, Cu and Zn which are similar to the result of the previous laboratory test. In particular, average arsenic removal efficiency of apatite is higher$(84\%)$ than that of fish bone$(75\%)$ like the result of the previous laboratory test. In case of precipitates of phosphate compounds which are generated from chemical reaction between apatite/fish bone and AMD, those generated from apatite/AMD reactionform powder-shape while those created from fish bone/AMD reaction seem to be sludge. Therefore, apatite will be used as a precipitant for mine drainages having wide range of pH based on previous studies while fish bone will be applied as a precipitantfor AMD having lower PH and high concentration of heavy metals.

울산폐철광산 광미 안정화를 위한 인회석의 중금속 제거 실내실험

최정찬,Choi, Jung-Chan 한국지하수토양환경학회 2006 지하수토양환경 Vol.11 No.4

The purpose of this study is to evaluate laboratory experiments on arsenic and cadmium removal from tailings using apatite at the Ulsan Abandoned Iron Mine, and to develop a stabilization technique. The results of this study show that the permeability is decreased proportionally to the amount of apatite when it is added below 8%, while this is almost constant when the amount of apatite is added above 10%. The water extraction test from tailings using deionized water for several days shows that pH (7.4-8.4) is almost constant or slightly increased when apatite is added below 8%, while it is slightly decreased when apatite is added above 10%. According to TCLP test, reduction of concentrations of heavy metals in leachate is proportional to amount of apatite added. It seems that precipitates generated from leachate-apatite chemical reaction are not redissolved. As a result, cadmium and arsenic in leachate is mostly removed when apatite is added above 10%, and it is suggested that a proper technique should be selected for field application because either mixed or layered method shows almost same removal efficiencies of cadmium and arsenic in tailings.

고로폐광산 침출수 처리대책 설계

최정찬,이민희,Choi, Jung-Chan,Lee, Min-Hee 한국지하수토양환경학회 2004 지하수토양환경 Vol.9 No.2

본 연구의 목적은 석회석 및 인회석을 이용한 실내실험을 실시하여 ARD 내의 비소저감 효율성을 평가하고 인회석 배수 체계를 설계하는 것이다. 실내실험 결과, pH, 비소저감율 및 석회석/인회석의 용해량은 유속에 반비례 하였으며 인회석은 유속 0.6 ml/min/kg에서 비소를 100% 제거하였다. 인회석의 용해율은 석회석보다 10배 정도 높은 것으로 사료된다. 비소화합물은 비산염인회석 그리고/또는 칼슘비산염수화물의 형태인 것으로 추측된다. 실내실험에 근거하여 인회석 배수체계를 설계하였으며 그 결과는 다음과 같다; 1년 6개월 마다 인회석 62톤을 새로 충진시켜줘야 하며 침전물은 매 3개월 마다 침전조에서 제거해줘야 할 것이다. The purpose of this study is to evaluate a laboratory test on arsenic reduction efficiency for ARD (Acid Rock Drainage) using limestone and apatite, and to design an apatite drain system. As a result of the laboratory test, results of this study show that pH, arsenic removal ratio, and dissolution amount of limestone & apatite are inversely proportional to flow rates, and apatite removes 100% of arsenic at 0.6 ml/min/kg flow rate. It is supposed that dissolution rate of apatite is ten times higher than that of limestone. The arsenic compounds are assumed to be Johnbaumnite, and/or Ca-arsenic hydrate. According to the results of the laboratory test, apatite drain system is designed as follow; Sixty two tons of apatite will be needed per one year and six months, and the precipitates will be removed from the precipitation pond per 3 months.

Field Experiment on Iron and Aluminum Removal from Acid Mine Drainage Using an Apatite Drain System

최정찬,Choi, Jung-Chan,West, Terry R. The Korean Society of Economic and Environmental G 1996 자원환경지질 Vol.29 No.3

An apatite drain was constructed on September 30, 1994 at the Green Valley Abandoned Coal Mine site near Terre Haute in west central Indiana. The primary objective of this experiment is to evaluate the long-term ability of the apatite drain to mitigate acid mine drainage (AMD) under field conditions. The drain 9 m long, 3.3 m wide, and 0.75 m deep, contain 95 rum to No. 30 mesh-size apatite ore (francolite) and receive AMD seepage from reclaimed gob piles, and designed according to the laboratory testing. The apatite drain was covered with limestone riprap and filter fabric to protect the drainage system from stormwater and siltation. The drain consists of about 50 metric tons of apatite ore obtained from a phosphate mine in Florida. A gabion structure was constructed downstream of the apatite drain to create a settling pond to collect precipitates. Apatite effectively removed iron up to 4,200 mg/l, aluminum up to 830 mg/l and sulfate up to 13,430 mg/l. The pH was nearly constant for the influent and effluent, ranging between 3.1 and 4.3. Flow rate measured at the gabion structure ranged from 3 to 4.5 l/m. Precipitates of iron and aluminum phosphate (yellow and white suspendid solids) continued to accumulate in the settling pond.

Evaluation on Heavy Metals Removal Efficiencies in the Plating Factory Wastewater Using Apatite

최정찬(Jung Chan Choi) 대한지질학회 2006 지질학회지 Vol.42 No.2

국내 시설농업단지의 수리지질 특성을 고려한 인공함양 민감도 분석 : 수리전도도 및 주입정과 양수정의 이격거리

최정찬 ( Jung Chan Choi ),강동환 ( Dong-hwan Kang ) 한국환경과학회 2019 한국환경과학회지 Vol.28 No.9

In this study, the sensitivity analysis of hydraulic conductivity and separation distance (distance between injection well and pumping well) was analyzed by establishing a conceptual model considering the hydrogeologic characteristics of facility agricultural complex in Korea. In the conceptual model, natural characteristics (topography and geology, precipitation, hydraulic conductivity, etc.) and artificial characteristics (separation distance from injection well to pumping well, injection rate and pumping rate, etc.) is entered, and sensitivity analysis was performed 12 scenarios using a combination of hydraulic conductivity (10^-1 cm/sec, 10^-2 cm/sec, 10^-3 cm/sec, 10^-4 cm/sec) and separation distance (10 m, 50 m, 100 m). Groundwater drawdown at the monitoring well was increased as the hydraulic conductivity decreased and the separation distance increased. From the regression analysis of groundwater drawdown as a hydraulic conductivity at the same separation distance, it was found that the groundwater level fluctuation of artificial recharge aquifer was dominantly influenced by hydraulic conductivity. In the condition that the hydraulic conductivity of artificial recharge aquifer was 10^-2 cm/sec or more, the radius of influence of groundwater level was within 20 m, but In the condition that the hydraulic conductivity is 10^-3 cm/sec or less, it is confirmed that the radius of influence of groundwater increases sharply as the separation distance increases.

경상남도 합천군 신설도로의 SL-2 암반사면에 대한 지질공학적 고찰

최정찬(Jung-Chan Choi),송용선(Yong-Sun Song),라원진(Won-Jin La),김남훈(Nam-Hoon Kim) 한국암석학회 2005 암석학회지 Vol.14 No.3

경상남도 합천군에 건설 중인 도로사변에 당초 설계와는 다른 암질 및 불연속면이 분포하고 있다. 따라서 당초 설계와는 달리 소규모 산사태가 발생되어 정상적인 공사추진에 애로사항이 있으므로, 현장조사 및 실내작업을 통하여 지정된 사변에 대한 전체적인 지질공학적인 분석을 하는 것이 본 연구의 목적이다. 이를 위해 측량, 슈미트해머(Schimidt Hammer) 시험, 불연속면 조사를 시행하였고 실내에서 DIPS 프로그램을 이용하여 사면의 안정성을 분석하였다. 분석결과, 평면, 전도 및 쐐기파괴의 가능성이 있으며 용출수가 집중되는 곳이 있으므로 이에 대한 보강 공사가 요구되고 있다. The road slope at Hapcheon-Gun, Gyeongsangnam-Do is under construction, but actual rock quality & discontinuities on the cut slope are something different from the primary design. Therefore, object of this study is to analyze whole engineering-geological characteristics for this slope through site investigation and laboratory analyses because small scale landslides have been occurred during this road construction. For this object, various analyses were performed such as surveying, Schimidt Hammer test, discontinuity investigation and laboratory analysis using DIPS for evaluating slope stability. As the result, it is identified that reinforcement work is needed because plane, toppling & wedge failures will be possibly occurred and seepages are concentrated at several points.

황령산 산사태 원인 분석에 대한 연구

최정찬 ( Jung Chan Choi ),백인성 ( In Sung Paik ) 대한지질공학회 2002 지질공학 Vol.12 No.2

미국 인디아나주 남서부의 Friar Tuck 폐판광에 대한 환경평가 및 최종 복구설계

최정찬 ( Jung Chan Choi ),( Terry R. West ) 대한지질공학회 1996 지질공학 Vol.6 No.2

아스팔드 표면에 사용되는 자갈골재 평가 과정 개발에 대한 연구

최정찬 ( Jung Chan Choi ) 대한지질공학회 1998 지질공학 Vol.8 No.3