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수소생산을 위한 생물전기화학반응기의 성능향상방안

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Alternative Title
Performance Improvement Methods of Bioelectrochemical System for Hydrogen Production
Abstract
Microbial electrolysis cells (MECs) are capable of converting the chemical energy of organic waste into hydrogen gas. In MECs, an additional voltage is supplied to the cell and by lowering cathode potential, protons are reduced at the cathode to produce hydrogen gas. In present study, several experiments were performed to investigate lower-cathode cost materials for MECs and to enhance the performance of a scale-up MEC. Firstly, performance of a wire type cathode with a reduced Pt loading was assessed by comparing with a disk type cathode that has 7 times larger surface area than that of the wire type cathode. Secondly, different types of tubular anion exchange membranes (AMI and EDC) were evaluated for developing a scale-up tubular MEC. Thirdly, the optimal anion exchange membrane (EDC) was used to make membrane cathode assembly in a continuous-flow tubular MEC and seawater was evaluated as a catholyte to replace phosphate buffer solution in the cathode chamber. The summarized results of this study are as follows. 1. Although the wire type cathode has 1 cm^(2) surface area with sufficiently low Pt loading (0.02 mg Pt/cm^(2)), the performance of the MECs equipped with the wire type cathodes showed similar or better performances than that of the disk type cathodes (7 cm^(2), 0.5 mg Pt/cm^(2)) at various sodium acetate concentrations in terms of coulombie efficiency (CE), hydrogen production rates (Q), cathodic hydrogen recovery r_(cat)), energy recovery (ηE). The result of Electrochemical Impedance Spectroscopy (EIS) showed that film resistance and polarization resistance of the wire type cathode were lower than those of the disk type cathode because of thiner catalyst layer and high current density. 2. In order to find the optimum membrane cathode assembly in the tubular reactor, the performances of AMI and EDC membranes were evaluated. COD was completely removed in both reactors but MECs with EDC showed better performance in terms of CE, Q, r_(cat), and ηE than MECs with AMI. Also, EIS results showed the internal resistance of EDC was higher than that of AMI. 3. A continuous-flow tubular MEC was operated with the EDC membrane. At initial phase, PBS was used as a catholyte solution and after 3 days of the operation, artificial seawater was supplied to the cathode chamber instead of PBS. Similar performances were achieved in both conditions in terms of current density, COD removal, r_(cat) and and Q but energy efficiency with PBS was 8% higher than that with artificial seawater. When using artificial seawater, calcium and magnesium ions were removed by 59% and 53%, respectively. This shows that bioelectrochemical system can be used as a pretreatment step for seawater desalination to prevent inorganic fouling on reverse osmosis (RO) membrane.
Author(s)
김미진
Issued Date
2017
Awarded Date
2017. 8
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000008278
Alternative Author(s)
Kim, Mijin
Affiliation
제주대학교 일반대학원
Department
대학원 환경공학과
Advisor
감상규
Table Of Contents
Summary vii
I. 서론 1
II. 문헌연구 2
II.1. 바이오수소 생산 기술 3
II.1.1. 광합성에 의한 직접 물 분해 3
II.1.2. 광합성에 의한 간접 물 분해 4
II.1.3. 광합성 발효 4
II.1.4. 암발효 5
II.2. 미생물전해전지 8
II.2.1. 구조 8
II.2.2. 원리 10
II.2.3. 성능평가 지표 10
II.2.4. 환원전극 재료 13
II.2.5. 스케일-업 17
III. 재료 및 방법 21
III.1. 큐빅 반응기 및 운전조건 21
III.1.1. 반응기 형태 및 재료 21
III.1.2. 환원전극제조 23
III.1.3. 운전조건 23
III.2. 원통형 반응기 및 운전조건 25
III.2.1. 반응기형태 및 재료 25
III.2.2. 막 전극 접합체 제조 28
III.2.3. 운전조건 28
III.3. 측정 및 분석 28
III.3.1. 전기발생 모니터링 29
III.3.2. 화학적 분석 29
III.3.3. 가스 분석 29
III.3.4. 임피던스 측정 30
IV. 결과 및 고찰 32
IV.1. 큐빅 반응기에서 disk 형과 wire형 전극의 성능비교 32
IV.1.1. 전류밀도 및 COD제거율 32
IV.1.2. 수소생산 및 전환 37
IV.1.3. 에너지효율 40
IV.1.4. 환원전극의 임피던스 42
IV.2. 원통형 반응기에서 멤브레인간 성능비교 44
IV.2.1. 전류발생 및 COD제거율 44
IV.2.2. 수소생산 및 에너지효율 51
IV.2.3. 막 전극 접합체의 임피던스 55
IV.3. 원통형 반응기의 연속운전에서 성능평가 57
IV.3.1. 전류밀도와 전극전위 57
IV.3.2. 유출수 성상 59
IV.3.3. 수소생산 및 에너지효율 64
V. 결론 67
참고문헌 69
Degree
Master
Publisher
제주대학교 일반대학원
Citation
김미진. (2017). 수소생산을 위한 생물전기화학반응기의 성능향상방안
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General Graduate School > Environmental Engineering
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