Resource utilization of landfill leachate gasification in supercritical water

被引：42
作者：
Chen, Yunan [1 ]
He, Youyou [1 ]
Jin, Hui [1 ]
Guo, Liejin [1 ]
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn SKLMF, Xian 710049, Shaanxi, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2020年 / 386卷
基金：
中国国家自然科学基金;
关键词：
Landfill leachate; Supercritical water; Hydrogen production; COD removal; NH3-N removal; HYDROGEN-PRODUCTION; CATALYTIC GASIFICATION; BIOMASS GASIFICATION; NITROGEN REMOVAL; ELECTRO-FENTON; HEATING RATE; OXIDATION; SLUDGE; DECOMPOSITION; RECOVERY;
D O I：
10.1016/j.cej.2020.124017
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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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页数：11
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