• Title, Summary, Keyword: column leaching

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Evaluation of Leaching Potential of Heavy Metals from Bottom Ashes Generated in Coal-fired Power Plants in Korea (국내 석탄 화력발전소 배출 바닥재의 중금속 용출 가능성 평가)

  • Park, Dongwon;Choi, Hanna;Woo, Nam C.;Kim, Heejoung;Chung, David
    • Journal of Soil and Groundwater Environment
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    • v.18 no.7
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    • pp.32-40
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    • 2013
  • This study was objected to evaluate the potential impact on the groundwater environment of the coal bottom ash used as fill materials on the land surface. From four coal-fired power plants, bottom-ashes were collected and analyzed through sequential extraction and column leaching tests following the meteoric water mobility procedure. The column tests shown leaching heavy metals including Pb, As, B, Cu, Zn, Mn, Ni, Ba, Sr, Sb, V, Cr, Mo, and Hg. The relatively high concentrations of B, Sr, Ba, and V in leachate were attributed to both the higher concentrations in the bottom ash and the relatively higher portion of leachable state, sorbed state, of metals. Bottom-ash samples from the D-plant only show high leaching potential of sulfate ($SO_4$), probably originated from the coal-combustion process, called the Fluidized Bed Combustion. Consequently, to manage recycling bottom ashes as fill materials, an evaluation system should be implemented to test the leaching potentials of metals from the ashes considering the absolute amount of metals and their state of existence in ashes, and the coal-combustion process.

Potential Environmental Influences in Soil by Accidental Fluorine (F) Leakage, Using Leaching Test (용출시험을 통한 불산 누출사고지역의 토양 내 불소(F)의 거동특성)

  • Kim, Doyoung;Lee, Junseok;Kwon, Eunhye;Lee, Hyun A;Yoon, Hye-On;Lee, Sanghoon
    • Journal of Korean Society of Environmental Engineers
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    • v.37 no.4
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    • pp.234-239
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    • 2015
  • Various leaching tests were applied to the soil affected by accidental leakage of HF in an industrial area in Korea. Three different leaching methods including pH-stat, continuous batch leaching, and column tests were adopted to assess leaching characteristics and mobility of fluorine(F) in soil and the potential risks to ecosystem. Both natural and spiked samples were used for the leaching tests. F concentrations in the batch tests increased by leaching rapidly in the early stage of leaching and then maintained rather constant levels. Column leaching test also show similar result to that of the batch test. pH also controlled the leaching behavior of the soil. With increasing pH, more F was released in the pH-stat test. This is mainly due to the competition and exchange with hydroxyl ions, as pH increase to the alkaline range. Most of the F released by the accident seem to have removed in the very early stage of leaching, whereas some natural proportion from soil minerals are thought to have been released very slowly. Therefore, little F released during the accident remained, based on the results of this study on the samples after two years of the accident. We could conclude that soil contaminated by external effects such as chemical accidents should be managed immediately, especially with F.

Long Term Leaching Characteristics of the Solidified Landfill Sludge (고화처리물(固化處理物)의 매립(埋立)에 따른 장기용출특성(長期溶出特性))

  • Kwon, Gi-Hong;Jeong, Dong-Jun
    • Journal of the Korean Society of Industry Convergence
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    • v.1 no.1
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    • pp.51-58
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    • 1998
  • This study was carried out to investigate the leaching characteristics by the landfill of solidified sludge. pH of leachate was 3.7 - 5.8 and 8.0 - 10.4 in each column using sand as a top-soil layer on filled municipal waste and solidified cake. $NH_3$-N in leachate was increasing in the each column using sand as a top-soil layer on filled dewatered sludge and solidified cake, but decreasing in the each column using sand and solidified cake by top-soil layer on filled municipal waste. Also the concentration of $NO_3$-N was on the way of stabilizing but was difficult to find any tendency until now. Zn and Mn in leachates were the highest in the column filled with the solidified sludge, Cr, Pb and Cd were low concentration at each column.

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Adsorption and Leaching of cis and frans-Permethrin in the Soil (토양 중 cis 및 trans-Permethrin의 흡착 및 침출)

  • Sam Edward Feagley
    • Journal of Environmental Science International
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    • v.4 no.4
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    • pp.379-386
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    • 1995
  • Permethrin [3-phenox yben zyl(1RS)-cis,tans-3-(2,2-dichloroviny1)-2,2- dimethylcyclopropane carboxylate] insecticides were selected to study adsorption and leaching potentials related to pollution on Commerce silty clay loam soil near Baton Rouge, Louisiana, USA. GLC-ECD chromatogram of permethrin included 32.5 % of cis-pemehin and 67.4 % of trans-permethrin. Extraction efficiencies of is and trmu-pemetun were 92.5 % and 92.3 % in fortified water, respectively and 85.9 % and 88.8 % in fortified soil, respectively. At a 1:10 moi]/water ratio,the Koc values for sis and fan isomers of permethrin were 938 and 877, respectively. Leaching of permethrin was evaluated in soil columns$(5.4 cm i.d. \times 26 cm length)$. Total recoveries of the permethrin applied to the soil column were $84.5\pm3.1%$. When the soil columns were leached with three pore volumes of water, the distributions of cis-permethrin leached were 6.10 % and 0.07 % of amount applied in the untreated zone soil and leachate water, respectively Trans-pemethrin distributions were 5.20 % in the untreated zone soil and 0.05 % in leachate water. Cis and trans-pemethrin was strongly adsorbed to soil. The results of the study showed the strong relationship between adsorption and leaching. Cis and trans-permethrin to be leached into the groundwater in soils with shallow aquifers were suggested a low leaching potential.

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Long-term Leaching Characteristics of Lead Contaminated Soils treated with Soluble Phosphate (액상인산염으로 처리된 납 오염토양 복원의 장기용출 특성)

  • Lee Eui-Sang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.7 no.3
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    • pp.453-457
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    • 2006
  • A long-term leaching column experiment was performed to evaluate the teachability of the stabilized lead-contaminated soil using soluble phosphate. The study shows that Pb in the leachate was little detected and the remaining $PO_4-P$ concentration kept below 0.1 mg/L due to the formation of geochemically stable lead phosphate minerals from the reactions of labile soil Pb forms with the added soluble phosphate salt. After the experiment, there was no Pb migration from the top to the bottom of the stabilized soil column. But the Pb concentrations of the 12 soil samples from the control column decreased with the increase of the soil depth.

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농경지 토양에서 N과 P의 거동 특성

  • 최태범;장윤영;이기철
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • pp.451-454
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    • 2003
  • Nonpoint source pollution of groundwater and subsurface water from irrigated agriculture is a major concern in many areas. In this study we aimed to investigate the effect of the water applied by irrigation in agricultural area on the transport of nitrogen and phosphorus originated from fertilizers applied to the surface of soil in agricultural activities. We first conducted investigation on the resdual concentrations of soil N and P in a selected agricultural area. And simulating the target area by column studies in the laboratory leaching extent of various components from the composite and urea fertilizers applied on the soil surface during irrigation was studied. Infiltration of water enhanced the leaching of nitrogen and phosphorus in both the rice paddy field soil and the patch soil. The downward N and P transport with infiltrating water was more pronounced in the patch soil column and the increased residual concentrations of N and P in the lower sections in the patch soil column was found with time.

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Recovery of Pt from the Chloride Leaching Solution of Spent Catalysts by using Column Extractor (폐촉매(廢觸媒) 염산침출액(鹽酸浸出液)에서 컬럼형 추출기(抽出器)에 의한 백금(白金) 회수(回收))

  • Sun, Pan-Pan;Lee, Man-Seung
    • Journal of the Korean Institute of Resources Recycling
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    • v.22 no.6
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    • pp.26-32
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    • 2013
  • In order to recover Pt from the hydrochloric acid leaching solution of spent catalysts, bench scale Karr reciprocating column was employed. At an optimum flow rate and vibration frequency, iron and Pt was completely extracted by using TBP and Aliquat 336. At the same vibration frequency, iron and Pt was completely stripped by HCl and $HClO_4$ after adjusting the flow rate. In the case of extraction of HCl from the raffinate with TEHA, it was difficult to maintain the stability of the column extractor. A comparison of the operation results between column extractor and mixer-settler is reported.

Leaching behaviour of the systemic insecticide carbofuran and the herbicide pretilachlor in soil columns (토양 column중 침투성 살충제 carbofuran과 제초제 pretilachlor의 용탈)

  • Lee, Jae-Koo;Kyung, Kee-Sung;Jung, In-Sang;Ahn, Ki-Chang;Kwon, Jeong-Wook
    • The Korean Journal of Pesticide Science
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    • v.2 no.2
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    • pp.59-67
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    • 1998
  • 토양중 침투성 살충제 carbofuran과 제초제 petilachlor의 용탈행적을 구명하기 위하여 물리화학적 성질이 상이한 2종의 논토양으로 충전된 토양 column (내경 5cm ${\times}$ 길이 30cm)에 $^{14}C$-표지 화합물을 각각 처리한 후 벼 (Oryza sativa L.)를 생육시키면서 벼를 심지 않은 경우를 대조구로 하여 8주 동안 주당 95.2 ml씩 용탈시켰다. Carbofuran의 경우 토양 column에서 용탈된 $^{14}C$ 방사능의 양은 벼를 재배하지 않은 토양 A와 B에서 각각 총처리 방사능의 74.8와 92.3%였으며, 벼를 재배한 토양에서는 각각 45.1%와 69.7%였다. 반면에 petilachlor의 경우 벼를 재배한 토양 column에서는 각각 총처리 방사능의 2.4%와 5.0%가 용탈되었으며, 벼를 재배한 경우는 각각 3.1%와 8.2%가 용탈되었다. 토양에 처리한 [$^{14}C$]화합물 모두 벼의 생육유무에 관계없이 양이온치환용량, 유기물 및 점토의 함량이 적은 토양 B에서 $^{14}C$ 방사능의 용탈이 증가되었다. 토양 column중 carbofuran의 이동성은 매우 높은 반면에 petilachlor는 매우 낮았으며, 이는 그들의 토양흡착과 수용성에 기인된 것으로 판단된다.

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Sorption and Leaching Studies of Fenitrothion and Tebuconazole in Granular Activated Carbon and Charcoal (Fenitrothion과 Tebuconazole의 입상 활성탄 및 차콜에 의한 흡착과 용탈에 관한 연구)

  • Lee, Dong-Ik;Chun, So-Ul;Joo, Young-Kyoo
    • Asian Journal of Turfgrass Science
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    • v.20 no.1
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    • pp.47-55
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    • 2006
  • Golf course community has always been concerned about water quality regarding to pesticide and fertilizer managements. This study conducted to investigate sorption and leaching behavior of common pesticides used for golf course in granular activated carbon I (GAC 1), granular activated carbon II(GAC II), and charcoal. We used batch study to investigate the influence of concentrations of Smithion and Folicur and particle sizes of GAC I, GAC II, and charcoal on sorption. Also, column study was used to investigate the leaching effect of Smithion in GAC I and charcoal. We found that sorption of Smithion and Folicur were higher in less $45{\mu}m$ of particle size for GAC I, GAC II, and charcoal compared to $1.7{\sim}2.0mm$ size, and the sorption of Smithion and Folicur in less $45{\mu}m$ of particle size ranged from 90 to 99%. In the column study, there was no difference in leaching effect between GAC I and charcoal. Overall, we found that charcoal might offer a cost effective adsorbent as a pesticides in leachate.

Comparative Investigation of the Contamination characteristics on As contaminated Sites (비소 오염지역의 오염특성 비교조사)

  • Yu, Chan;Yun, Sung-Wook;Baek, Seung-Hwan;Park, Jin-Chul;Lee, Jung-Hoon
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1647-1654
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    • 2008
  • The characteristics of arsenic(As) contamination were investigated on soils of 3 abandoned metal mine sites in Gangwon-do, Korea. Total forty nine soils were sampled to conduct standard methods(extraction by 1HCl), sequential extraction and column leaching test. Concentration of As extracted by 1N HCl was ordered as follows: A mine > B mine > C mine, and the concentration of arsenic in the soils of A mine was significantly greater than that at any other cases and all samples of A mine were exceeded the national regulation of $6mg \;kg^{-1}$. In the results of sequential extraction, the potential contamination risk for groundwater and plants was ordered as follows: C mine > B mine > A mine because the C mine showed the relatively greater mobility and bioavailability of fraction than any other mines. And, in colume test, concentration of As was ordered as follows: C mine > B mine > A mine, and it was expected that these results were connected with fraction characteristics of the mine sites. Therefore adequate leaching investigations should be used to simulate the effect of natural leaching conditions, and to predict both the potential mobility of metals to groundwater and their bioavailability to plants under natural conditions.

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