Catalytic Wet Air Oxidation of Ammonia Solutions with Addition of Cu/La/Ce
碩士 === 國立中山大學 === 環境工程研究所 === 90 === ABSRACT This study was to investigate the removal efficiency and kinetics in oxidation of ammonia solutions (NH3-N) in ranging from 400 mg/L to 1000 mg/L by adding Cu/La/Ce catalyst in process of Wet Air Oxidation (denoted by WAO). All experiments were conducted...
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ndltd-TW-090NSYS55150102015-10-13T10:30:05Z http://ndltd.ncl.edu.tw/handle/56391703160335924384 Catalytic Wet Air Oxidation of Ammonia Solutions with Addition of Cu/La/Ce 添加Cu/La/Ce觸媒於濕式氧化程序處理含氨水溶液之研究 Chia-Hua Lin 林家驊 碩士 國立中山大學 環境工程研究所 90 ABSRACT This study was to investigate the removal efficiency and kinetics in oxidation of ammonia solutions (NH3-N) in ranging from 400 mg/L to 1000 mg/L by adding Cu/La/Ce catalyst in process of Wet Air Oxidation (denoted by WAO). All experiments were conducted in semi-batch and continuous reactors in series. The major parameters included temperature, pressure, concentration and pH. In the semi-batch type of WAO experiments, the major parameters were performed at the following conditions: an initial concentration NH3-N of 400 mg/L, temperatures ranging from 423 K to 503 K, a total pressure of 4.0 Mpa, and a pH of 12.0. A removal efficiency of 32.7%was obtained in WAO process at 503 K for180 min, but it could be significantly promote to 95.1% after adding a catalyst of molar ratio 7:2:1.The kinetics of WAO with this catalyst in oxidation of NH3-N solutions, using a test of half-life, was developed nearly to a zero order. The reaction constants were 10.12 KJ/mol, 9.12 KJ/mol, and 6.57 KJ/mol at 503 K, 473 K and 423 K. In the continuous type of WAO experiments, the major parameters were performed at the following conditions: an initial concentration NH3-N of 400 mg/L, a temperature of 503 K, a total pressure of 2.0 Mpa, a pH of 12.0 and a liquid space velocity of 4.5 hr-1 (averagelyresidence time 14 min) . A removal efficiency of NH3-N of 6.5 % only was achieved in WAO process for a space velocity of 4.5 hr-1 (averagely residence time 14 min) , but after adding a catalyst of molar ratio 7:2:1 it increased to 72.3 % for a same residence time and a better efficiency of above 91 % was found for 1.5 hr-1 (averagely residence time 40 min) . For increasing the initial concentration of NH3-N into 600 mg/L, 800 mg/L, and 1000 mg/L the removal efficiency of NH3-N decreased with 85 %,75 % and 69 % for 1.5 hr-1 . Thus, the initial concentration of NH3-N in influent inhibits the removal efficiency in the oxidation process. The higher initial concentration the lower removal efficiency. Chi-Chung Lou 樓基中 2002 學位論文 ; thesis 172 zh-TW |
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碩士 === 國立中山大學 === 環境工程研究所 === 90 === ABSRACT
This study was to investigate the removal efficiency and kinetics in oxidation of ammonia solutions (NH3-N) in ranging from 400 mg/L to 1000 mg/L by adding Cu/La/Ce catalyst in process of Wet Air Oxidation (denoted by WAO). All experiments were conducted in semi-batch and continuous reactors in series. The major parameters included temperature, pressure, concentration and pH.
In the semi-batch type of WAO experiments, the major parameters were performed at the following conditions: an initial concentration NH3-N of 400 mg/L, temperatures ranging from 423 K to 503 K, a total pressure of 4.0 Mpa, and a pH of 12.0. A removal efficiency of 32.7%was obtained in WAO process at 503 K for180 min, but it could be significantly promote to 95.1% after adding a catalyst of molar ratio 7:2:1.The kinetics of WAO with this catalyst in oxidation of NH3-N solutions, using a test of half-life, was developed nearly to a zero order. The reaction constants were 10.12 KJ/mol, 9.12 KJ/mol, and 6.57 KJ/mol at 503 K, 473 K and 423 K.
In the continuous type of WAO experiments, the major parameters were performed at the following conditions: an initial concentration NH3-N of 400 mg/L, a temperature of 503 K, a total pressure of 2.0 Mpa, a pH of 12.0 and a liquid space velocity of 4.5 hr-1 (averagelyresidence time 14 min) . A removal efficiency of NH3-N of 6.5 % only was achieved in WAO process for a space velocity of 4.5 hr-1 (averagely residence time 14 min) , but after adding a catalyst of molar ratio 7:2:1 it increased to 72.3 % for a same residence time and a better efficiency of above 91 % was found for 1.5 hr-1 (averagely residence time 40 min) . For increasing the initial concentration of NH3-N into 600 mg/L, 800 mg/L, and 1000 mg/L the removal efficiency of NH3-N decreased with 85 %,75 % and 69 % for 1.5 hr-1 . Thus, the initial concentration of NH3-N in influent inhibits the removal efficiency in the oxidation process. The higher initial concentration the lower removal efficiency.
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author2 |
Chi-Chung Lou |
author_facet |
Chi-Chung Lou Chia-Hua Lin 林家驊 |
author |
Chia-Hua Lin 林家驊 |
spellingShingle |
Chia-Hua Lin 林家驊 Catalytic Wet Air Oxidation of Ammonia Solutions with Addition of Cu/La/Ce |
author_sort |
Chia-Hua Lin |
title |
Catalytic Wet Air Oxidation of Ammonia Solutions with Addition of Cu/La/Ce |
title_short |
Catalytic Wet Air Oxidation of Ammonia Solutions with Addition of Cu/La/Ce |
title_full |
Catalytic Wet Air Oxidation of Ammonia Solutions with Addition of Cu/La/Ce |
title_fullStr |
Catalytic Wet Air Oxidation of Ammonia Solutions with Addition of Cu/La/Ce |
title_full_unstemmed |
Catalytic Wet Air Oxidation of Ammonia Solutions with Addition of Cu/La/Ce |
title_sort |
catalytic wet air oxidation of ammonia solutions with addition of cu/la/ce |
publishDate |
2002 |
url |
http://ndltd.ncl.edu.tw/handle/56391703160335924384 |
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