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Degradation mechanisms and byproducts formation of geosmin and 2-MIB during UV photolysis and combined UV/chlorine reaction : 자외선/염소반응 및 광분해를 통한 지오스민과 2-MIB 의 제거기작 및 부산물생성 규명에 관한 연구
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 조경덕 | - |
dc.contributor.author | 김태경 | - |
dc.date.accessioned | 2017-07-19T03:11:06Z | - |
dc.date.available | 2017-07-19T03:11:06Z | - |
dc.date.issued | 2016-02 | - |
dc.identifier.other | 000000132654 | - |
dc.identifier.uri | https://hdl.handle.net/10371/128242 | - |
dc.description | 학위논문 (석사)-- 서울대학교 보건대학원 : 보건대학원 환경보건학과 환경보건학 전공, 2016. 2. 조경덕. | - |
dc.description.abstract | The treatment and control of Geosmin (GSM) and 2-methylisoborneol (2-MIB) have become a priority task in the drinking water industry because these odorants have been associated with the quality and safety of drinking water. While the removals of common taste and odor (T&O) compounds by ozonation, ultrasonication and UV/AOP have been widely reported, only a little were reported on the formation of by-products during the treatment. GSM and 2-MIB have no health effect. However, these compounds have the possibility to be the precursors of THM as well as other hazardous by-products due to their strong oxidation potential. Therefore, the investigation of their by-products formed during treatmentis needed.In this study, chlorination, UV photolysis and combined UV/chlorine reactions were conducted to investigate the degradation mechanisms and byproducts formation of geosmin (GSM) and 2-methylisoborneol (2-MIB) in aqueous system. Chlorination was ineffective for the removal of GSM and 2-MIB, while UV irradiation and UV/chlorine reactions efficiently removed both compounds. Kinetics during UV photolysis and UV/chlorination followed the pseudo first-order reaction. Chloroform was found as a chlorinated byproduct during UV/chlorine reaction of both GSM and 2-MIB with the yield up to 87% while other chlorinated byproducts were not detected. The pH affected on both removal rate and chloroform production. The removal rate was highest at pH 5-7 and formation of chloroform was lowest at this condition. The byproducts of GSM and 2-MIB were identified by GC/MS and LC-MS/MS. The identified open ring and dehydration compounds were1,4-dimethyl-adamantane, 1,3-dimethyl-adamantane, 2-methylenebornane, 2-methyl-2-bornene, respectively. These byproducts were removed with further reaction. Furthermore, possible degradation pathways for the UV/Chlorine of both compounds were suggested. | - |
dc.description.tableofcontents | 1. Introduction 1
1.1. Background 1 1.2. Removals in water treatment 2 1.3. Objectives 3 2. Materials and Methods 4 2.1. Chemicals 4 2.2. Experimental procedures 5 2.3. Analytical methods 6 3. Results and Discussion 8 3.1 Degradation kinetics and mechanisms 8 3.2 pH dependence 14 3.3 Formation of chlorinated byproducts during the UV/chlorine process 15 3.4 Proposed degradation pathways of GSM and 2-MIB by UV irradiation and UV/Chlorine processes 18 4. Conclusions 27 5. References 28 국문초록 33 | - |
dc.format | application/pdf | - |
dc.format.extent | 542788 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 보건대학원 | - |
dc.subject | geosmin | - |
dc.subject | 2-MIB | - |
dc.subject | UV/chlorine | - |
dc.subject | Degradation kinetics | - |
dc.subject | Byproduct | - |
dc.subject.ddc | 363 | - |
dc.title | Degradation mechanisms and byproducts formation of geosmin and 2-MIB during UV photolysis and combined UV/chlorine reaction | - |
dc.title.alternative | 자외선/염소반응 및 광분해를 통한 지오스민과 2-MIB 의 제거기작 및 부산물생성 규명에 관한 연구 | - |
dc.type | Thesis | - |
dc.contributor.AlternativeAuthor | Tae-Kyoung, Kim | - |
dc.description.degree | Master | - |
dc.citation.pages | 33 | - |
dc.contributor.affiliation | 보건대학원 환경보건학과 | - |
dc.date.awarded | 2016-02 | - |
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