Evaluations of catalysts for wet oxidation waste management in CELSS
| Autor: | Mitsuo Oguchi, Keiji Nitta |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Atmospheric Science
Nitrogen Guinea Pigs Aerospace Engineering Raw material Catalysis Ruthenium Ammonia chemistry.chemical_compound Waste Management Oxidizing agent Aluminum Oxide Animals Rhodium Wet oxidation Kjeldahl method Titanium Minerals Sewage Chemistry Chemical oxygen demand Astronomy and Astrophysics Carbon Dioxide Oxygen Geophysics Catalytic oxidation Space and Planetary Science General Earth and Planetary Sciences Rabbits Oxidation-Reduction Ecological Systems Closed Life Support Systems Palladium Nuclear chemistry |
| Zdroj: | Advances in Space Research. 12:21-27 |
| ISSN: | 0273-1177 |
| DOI: | 10.1016/0273-1177(92)90004-h |
| Popis: | A wet oxidation method is considered to be one of the most effective methods of waste processing and recycling in CELSS (Controlled Ecological Life Support System). The first test using rabbit waste as raw material was conducted under a decomposition temperature of 280 °C for 30 minutes and an initial pure oxygen pressure of 4.9 MPa (50 kgf/cm2) before heating, and the following results were obtained. The value of COD (Chemical Oxygen Demand) was reduced 82.5 % by the wet oxidation. And also the Kjeldahl nitrogen concentration was decreased 98.8%. However, the organic carbon compound in the residual solution was almost acetic acid and ammonia was produced. In order to activate the oxidation more strongly, the second tests using catalysts such as Pd, Ru and Ru+Rh were conducted. As the results of these tests, the effectiveness of catalysts for oxidizing raw material ws shown as follows: COD and the Kjeldahl nitrogen values were drastically decreased 99.65 % and 99.88 %, respectively. Furthermore, the quantity of acetic acid and ammonia were reduced considerably. On the other hand, nitrate was showed a value 30 times as much as without catalytic oxidation. |
| Databáze: | OpenAIRE |
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