• Journal of the Korean Society of Groundwater Environment
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• v.6 no.4
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• pp.206-212
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• 1999

In order to evaluate the applicability of steel mill slag as a AMD (Acid Mine Drainage) neutralizer and to compare capacity of slag with that of limestone lab scale experiments were conducted. The fixed treatment experiments of AMD with slag and limestone separately for 24 hours under the stagnant condition showed that slag has higher capacity of pH increase and removal of Fe. Al and other trace elements. During the 10 days continuous step experiment the pH has been maintained and any decrease in the removal capacity of Fe and Al has not bun observed. In the trace element removal experiment slag showed higher capacity for removal of Ni, Co. Cu and Zn than limestone. The removal of trace element was more effective in AMD than in distilled water that the pH was adjusted to the same level of AMD (synthetic acid solution). It means that Fe and Al in AMD adsorbed trace elements during or after precipitation as oxide forms. In the size effect experiment, the slag of the smaller size with larger specific surface area exhibited higher capacity of pH increase and removal efficiencies of Fe. Al and other trace elements.

• Journal of the Korean Geotechnical Society
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• v.19 no.3
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• pp.83-91
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• 2003

The electrokinetic technique has been applied to remove mainly the heavy metal and the ultrasonic technique to remove mainly organic substance in contaminated soil. In this study, the combined electrokinetic and ultrasonic remediation technique was studied far the removal of heavy metal and organic substance in contaminated soils. This study emphasized the coupled effects of electrokinetic and ultrasonic techniques on migration as well as remediation of contaminants in soils. The laboratory soil flushing tests combining electrokinetic and ultrasonic technique were conducted using specially designed and fabricated devices to determine the effect of both of these techniques. A series of laboratory experiments involving the simple, electrokinetic, ultrasonic, and electrokinetic & ultrasonic flushing test were carried out. A soil admixed with sand and kaolin was used as a test specimen, and Pb and ethylene glycol were used as contaminants of heavy metal and organic substance. An increase in out flow, permeability and contaminant removal rate was observed in electrokinetic and ultrasonic flushing tests. Some practical implications of these results are discussed in terms of technical feasibility of in situ implementation of electrokinetic ultrasonic remediation technique.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1997.05a
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• pp.30-38
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• 1997

고속도로변에 설치된 retention pond는 drainage system의 일부분으로 우기에 빗물의 양을 조절하고 고속도로 노면에서 운반되어 retention pond에 유입된 오염된 입자를 침전, 제거시키기 위해 설치되었다. 빗물에 입자상태로 이동된 납, 아연, 카드뮴를 제거하기 위해 설치된 retention pond의 효과를 평가하기 위해 수리지질학적 연구 및 부유퇴적물의 물리화학적 특징을 규명하기 위한 연구가 수행되었다. 부유퇴적물과 비교하기 위해 심하게 오염된 roadside soil과 오염되지 않은 background soil에 대해서도 연구가 수행되었다. 부유퇴적물의 중금속함량은 background Sologne soil에 비해 원소에 따라 2-8배 높다. 그러나, roadside soil의 중금속함량은 부유퇴적물에 비해 7-26배 높다. Sequential extraction methods를 이용하여 분석한 결과 심하게 오염된 roadside soil에 존재하는 납, 아연, 카드뮴은 대부분 쉽게 용해될 수 있는 상태 (Fraction FII, FIII)로 존재하며 반면에 규산염광물과 수반되는 금속함량의 비율은 매우 낮다. 부유퇴적물에서는 규산염광물과 수반되는 금속함량이 전체 금속함량의 1/3까지 크게 증가한다. Roadside soil 과 부유퇴적물사이의 중금속함량 차이가 매우 큰 것은 중금속의 대부분이 retention pond에 이르기 전에 고속도로변과 배수로 일부에 축적되어 모두 상실하기 때문이다.

• Resources Recycling
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• v.21 no.6
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• pp.51-57
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• 2012

The objective of this study was to research the mineralogical characteristics and removal of heavy metals of tailings from Gum-poong mine. From the result of mineralogical analysis, there are several sulphide minerals such as chalcocite, aresenopyrite, pyrite, sphalerite and galena. Cd and Zn have a good positive correlation from the statistical relation between Cd and other heavy metals(Cu, Pb, Zn). Residual heavy metals(As, Cd, Cu, Pb, Zn) from the Gum-poong tailings were removed under the warning criteria from the result of froth flotation with K.A.X.(Potassium Amyl Xanthate) and Aerofloat 211.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2006.04a
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• pp.224-225
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• 2006

점토성 오염토양을 원위치 정화하는데 효과적인 것으로 알려진 Electrokinetic정화기술을 이용하여 폐광산의 광미를 대상으로 실험을 수행하였다. 실험은 초기 인가 전류 0.01A, 170V의 정전압모드로 약 950시간동안 운전하였으며, 투입된 총전력량은 5671.455 WH으로시간당 5.97W의 전력이 투입되는 것이다. 중금속류(As,Pb,Cd,Zn,Cu,Ni)에 대하여 $50{\sim}90%$의 제거효율을 보였으며 중금속 농도는 점차 감소하고 중금속별로 $Zn{\cong}Cd>Ni>Cu{\cong}Pb{\cong}As$ 의 경향을 보였다.

• Resources Recycling
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• v.26 no.2
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• pp.11-17
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• 2017

Many problems are occurred by using industrial by-product and municipal solid waste in the cement manufacturing process. The main components of chlorine by-pass dust generated by the use of the wastes are $K^+$, $Cl^-$, and a slight amount of heavy metals is also contained. In terms of waste recycling, it is necessary to eliminate the heavy metals. Therefore, in this study, the experiments for the removal of heavy metals from KCl which was produced by chlorine by-pass dust were conducted. In order to find optimum conditions for the removal of heavy metals, we have controlled the amount of water and precipitator. The type and concentration of heavy metals in KCl were analyzed. The concentration of heavy metals decreased as amount of precipitator increased. The heavy metals such as Pb, Cd, and As were not detected in dust A and B, when the mixing ratios between dust A(B) and water were controlled to be 1:2 (1:2, 1:3.5) with the addition of 3% precipitator (NaOCl).

• Journal of Environmental Impact Assessment
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• v.32 no.6
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• pp.431-436
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• 2023

As the industry develops, the amount of heavy metals flowing into the ecosystem is increasing. Heavy metals are difficult to decompose and remain in the ecosystem for a long time and cause toxicity, which is removed by physicochemical methods such as adsorption, filtration, and chemical precipitation during water treatment. In this study, Alginate bead was selected as a chelating resin for adsorbing and removing heavy metals, and the Jellyfish Extract at Immunity reaction (JEI) were mixed to evaluate the adsorption efficiency of heavy metals accordingly. beads mixed with JEI showed high adsorption efficiency in lead (79-99%) and copper (64-70%) according to the characteristics of Alginate, and low adsorption efficiency in cadmium (25-37%) and zinc (5-6%). Although heavy metal adsorption did not increase in proportion to the content of JEI, 50% and 100% JEI beads showed significant increases. As a result of applying the reaction rate equation, it was found that it was more suitable for the pseudo-secondary reaction equation than the pseudo-first reaction equation.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.09a
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• pp.172-174
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• 2004

본 논문은 광산산성배수(AMD)에서 철 및 알루미늄 제거 효과가 입증되고 ARD(Acid Rock Drainage)에서의 비소제거 효과가 확인된 인회석을 침전제로 사용하여 철, 알루미늄 및 비소가 아닌 다른 중긍속의 제거효율을 알아보기 위해 도금폐수를 이용하여 실내실험을 실시하였다. 실험결과, 도금폐수의 수질분석결과에 의하면 '수질환경보존법 오염물질 배출허용기준' <가>지역 방출수 기준을 초과하는 것은 pH, Zn, Fe, Cu, Cr 및 P였다. 실험 결과 인회석 40번체 통과분-100번체 잔류분을 사용하는 것이 가장 적절할 것으로 생각되며 유속은 1kg의 인회석에 11의 도금폐수를 3시간 동안 반응시키면 경제적, 시간적 측면에서 가장 적절한 것으로 사료된다. 이 경우 pH는 1.98에서 5.30으로 증가하고 Cr, Fe, Cu 및 Zn은 각각 77.10%, 99.58%, 99.39% 및 40.77% 제거되는 것으로 나타났다. 용해율은 0.3619 g/min/kg으로 계산되었다. 그러나 3시간의 반응시간으로는 크롬 및 아연을 기준치 이하로 제거하지 못하므로 인회석 반응조를 다단계로 하는 실험을 수행해 그 결과를 평가해야 할 것이다.

• Journal of the Korea Organic Resources Recycling Association
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• v.31 no.3
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• pp.93-102
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• 2023

This study investigated the possibility of treating heavy metal pollutants existing in the air in addition to simultaneously removing NOx and SOx by injecting oxidizing and reducing agents into a scrubber into a microbubble device to create an eco-friendly method that does not generate secondary pollutants. Lead compound (Pb) was selected as the heavy metal substance in the air to be treated with microbubbles, and the removal efficiency was confirmed. By treating microbubbles by connecting them to a scrubber, it was confirmed that not only NOx and SOx but also heavy metal substances in the air were reduced, cost was reduced, and secondary environmental pollutants were not generated. Through this study, it was possible to simultaneously remove NOx, SOx, and heavy metals at low cost by applying an eco-friendly method, rather than the existing high-cost treatment method such as SCR. If oxidizing agent, reducing agent, and microbubbles are used appropriately, economical and efficient air pollution can be achieved. Since material processing was possible, it is expected to be helpful in the technological development of environmental prevention facilities.

• Applied Chemistry for Engineering
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• v.32 no.1
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• pp.97-101
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• 2021

Adsorption properties of heavy metals and organics in the mixed packed column of scoria and activated carbon, as well as physicochemical properties and functional groups of scoria were investigated. As the mixing ratio of scoria increased, the average removal ratios of cadmium, nickel, chromium, and lead ions increased, but that of benzene and toluene decreased. The mixed packed column of scoria and activated carbon could be effectively used for the simultaneous removal of heavy metals and organics. Scoria has Si-H and Si-O functional groups, and it was confirmed that Si-O functional groups greatly contributed to the adsorption of heavy metals.