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Reduction of Pb Leachability by Stabilization Using Fly Ash from Contaminated Soil of Ulaanbaatar in Mongolia : 플라이 애쉬를 사용한 안정화 기법으로 몽골 울란바토르시 지역 납 오염토 용출 감소 평가
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 박준범 | - |
dc.contributor.author | 아마르바야르 | - |
dc.date.accessioned | 2017-07-14T04:15:02Z | - |
dc.date.available | 2017-07-14T04:15:02Z | - |
dc.date.issued | 2014-08 | - |
dc.identifier.other | 000000022296 | - |
dc.identifier.uri | https://hdl.handle.net/10371/124272 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 건설환경공학부, 2014. 8. 박준범. | - |
dc.description.abstract | Reduction of Pb Leachability by Stabilization Using Fly Ash from Contaminated Soil of Ulaanbaatar in Mongolia
Amarbayar Jugdernamjil Department of Civil and Environmental Engineering The Graduate School Seoul National University The focus of this laboratory research is present the findings of a study on reduction of Pb leachability by stabilization using fly-ash from contaminated soil of Ulaanbaatar in Mongolia. Lead can be stabilized in soils based on two mechanisms which are lead precipitation and soil pH control. C-class fly-ash, Portland cement, quicklime can be used to treat trace element contaminated soil, reducing their mobility due to increased soil pH which enhances precipitation and adsorption, and also due to pozzolanic reactions and cementation. In the present study, the various additives including Portland cement and quicklime with fly-ash and their various proportions were employed to stabilize Pb contaminated soil. All the Pb-contaminated 20 soil samples were obtained from 10 different locations (5 samples from gher district, 3 samples from multistoried administrative and residential building, 2 samples from industrial area) of Ulaanbaatar field. In each sample, there were collected top and sub soil sample. The concentration of Pb immobilization and effectiveness of the treatment were evaluated using the Toxicity Characteristic Leaching Procedure (TCLP) and maximum permissible concentration (MPC) of Pb in TCLP is 5mg/L. Additional leaching solutions, Simulated Acid Rain Solution (SARS) and deionized water were prepared with TCLP solutions to assess the leachable Pb in different leaching conditions. After leaching test, the pH measurement was performed in each sample. Also, the total Pb amount was evaluated Korean test method extraction of trace elements soluble in aqua regia. Harvard miniature compaction test was performed to estimate optimum moisture content for improving activity of chemical reaction between soil and additives. The unconfined compressive strength properties of the stabilized soils were measured to estimate the possibility of civil works and stabilization. The both of top soil and sub soil with fly-ash and cement mixture samples were showed highest amount of strength. Out of many treatments, the soil with fly-ash, Portland cement and quicklime combination was shown most effective solution in every leaching solutions. Keywords: Lead, Fly-ash, Harvard Miniature Compaction Test, Leaching solution, Unconfined Compressive Strength Test, TCLP, etc. Student Number: 2011-22907 | - |
dc.description.tableofcontents | Contents
Chapter 1 Introduction 1 1.1 Background 1 1.2 Objectives and scopes 3 Chapter 2 Literature Review 4 2.1 Pb contamination of Ulaanbaatar city 4 2.1.1 General 4 2.1.2 Environmental pollution with Pb from UB 5 2.2 Environmental problems of Pb contaminated soils 9 2.3 Stabilization treatment principles 11 2.4 Source of C-class fly-ash in Ulaanbaatar 13 Chapter 3 Materials and Methods 14 3.1 Materials 14 3.1.1 Study area amd soil sampling 14 3.1.2 Stabilizing additives 17 3.2 Experimental procedure 19 3.2.1 Geochemical characteristics test 19 3.2.1.1 Extraction of Pb soluble in aqua regia procedure 19 3.2.1.2 Toxicity characteristic leaching procedure 20 3.2.1.3 Preparation of simulated acid rain solution 23 3.2.2 Geotechnical characteristics test 25 3.2.2.1 Harvard miniature compaction test 25 3.2.2.2 Unconfined compressive strength test 26 Chapter 4 Results and Discussions 27 4.1 Result of geotechnical characteristics test 27 4.1.1 Harvard miniature compaction test 27 4.1.2 Unconfined compressive strength 29 4.2 Result of geochemical characteristics test 31 4.2.1 pH variation of before and after stabilization 31 4.2.2 Extraction of Pb soluble in aqua reqia 33 4.2.3 Toxicity characteristic leaching procedure 36 Chapter 5 Conclusions 38 Bibliography 41 List of Tables Table 2.1 Heavy metal contamination in UB soil 8 Table 3.1 The major elements of additives 18 Table 4.1 Permissible level of lead contamination in soil 33 | - |
dc.format | application/pdf | - |
dc.format.extent | 1650063 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | lead contaminated soil | - |
dc.subject | UCS | - |
dc.subject | Harvard miniature compaction test | - |
dc.subject | TCLP | - |
dc.subject | Ulaanbaatar | - |
dc.subject.ddc | 624 | - |
dc.title | Reduction of Pb Leachability by Stabilization Using Fly Ash from Contaminated Soil of Ulaanbaatar in Mongolia | - |
dc.title.alternative | 플라이 애쉬를 사용한 안정화 기법으로 몽골 울란바토르시 지역 납 오염토 용출 감소 평가 | - |
dc.type | Thesis | - |
dc.contributor.AlternativeAuthor | Amarbayar Jugdernamjil | - |
dc.description.degree | Master | - |
dc.citation.pages | 52 | - |
dc.contributor.affiliation | 공과대학 건설환경공학부 | - |
dc.date.awarded | 2014-08 | - |
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