期刊
CHEMICAL ENGINEERING JOURNAL
卷 386, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124017
关键词
Landfill leachate; Supercritical water; Hydrogen production; COD removal; NH3-N removal
资金
- Basic Science Center Program for Order-ised Energy Conversion (OEC) of the National Natural Science Foundation of China [51888103]
In this paper, original landfill leachate gasification in supercritical water was studied in high heating rate batch reactor. The experiments were carried out in the temperature range of 500-650 degrees C, residence time range of 0-30 min, and pressure range of 22.5-26.0 MPa. The effects of temperature, pressure, residence time, catalysts and oxidant on gasification, chemical oxygen demand (COD) and NH3-N removal rate were examined. As a result, high heating rate could promote landfill leachate gasification in supercritical water better. High temperature and long residence time could improve gasification efficiency. The highest carbon gasification efficiency (CE) reached 99.2% and hydrogen yield reached 26 mol/kg with KOH at 650 degrees C, 30 min. KOH could also improve COD and NH3-N conversion significantly. The highest COD and NH3-N removal rate was 94.6% and 51.0%, respectively. The addition of oxidant had the same effect on NH3-N elimination obtained with KOH. The results of experiments might predicate that the combination of catalytic and partial oxidation might be an effective method to remove NH3-N for landfill leachate gasification in supercritical water.
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