The Study of Hydrogen Productivity of Anaerobic Photohydrogenesis by Plug-Flow Reactors in Various Organic Loadings and Operational Conditions

• Main Authors: Chi Yu Hua, 紀又華
• Other Authors: Lin Min Ray
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/76484455315421486582

碩士 === 國立臺中教育大學 === 環境教育研究所 === 94 === The main purpose of this study was that photohydrogenic bacteria —Rhodopsedo-monas palustris (purple nonsulfur bacteria, strain WP3-5), which screened out from NCHU laboratory of professor Li, was used in the tests by opened-system and conti-nuous-input plug-flow reactors for hydrogen productivity in various organic loadings (influent COD concentration, HRT) and operational conditions (pH, Temp.). In tests of various organic loading, the main ingredients of influent were beef extract and glucose, the range of organic loadings were between 3.0~19.2 kg-COD/m3•day. The results were shown below: The test of highest organic loading (19.2 kg-COD/ m3•day) was the best operation. The hydrogen productivity of per unit reactor volume was 45.82 mol-H2/m3•day, the hydrogen content of biogas was 55.23% and the hydro-gen productivity of per gram influent COD was 2.45 mmol-H2/g-CODin. Therefore the operational condition (the highest organic loading: 19.2 kg-COD/m3•day) was used in tests of various operational conditions (pH and Temp.). The formula of linear regression and correlations is: The hydrogen productivity of per unit reactor volume (mol-H2/m3•day) =2.738(organic loading) - 8.087. In tests of various operational conditions(pH, Temp.), the influent COD concentra-tion was 8,000 mg/L with HRT of 10 h, the illumination was 11,000 lux, the pHs were 4.5, 5.0, 5.5, 6.0, the Temp. were 21, 28, 35, 43℃. In tests of various pHs, the results were shown below: The test of pH 5.0 was the best. The hydrogen productivity of per unit reactor volume was 45.72 mol-H2/m3•day, the hydrogen content of biogas was 54.90% and the hydrogen productivity of per gram influent COD was 2.48 mmol-H2/g-CODin. This was the best operational condition of pH. And the second one was the test of pH 4.5. The test of pH 5.5 was the third. The θpH (correction coefficient of pH tests) is 0.776. In tests of various temperatures, the results were shown below: The test of Temp. 35℃ was the best one. The hydrogen productivity of per unit reactor volume is 45.72 mol-H2/m3•day, the hydrogen content of biogas was 54.90% and the hydrogen productivity of per gram influent COD was 2.48 mmol-H2/g-CODin. This was the best operational condition of Temp. tests. And the second one was the test of Temp. 28℃. The test of Temp. 43℃ was the third. The θT (correction coefficient of Temp. tests) is 0.975. The formula of linear regression and correlations for all is: The hydrogen productivity of per unit reactor volume (mol-H2/m3•day) =〔2.738(organic loading)-8.087〕× , which was tested in 3.0~19.2 kg-COD/ m3•day, pH=4.5~ 6.0, Temp. 21~43℃. The results of this study can be provided as a reference of control and operation for anaerobic photohydrogenic reactors.