Partial oxidation of landfill leachate in supercritical water: Optimization by response surface methodology

•Partial oxidation of landfill leachate in supercritical water was investigated.•The process was optimized by Box–Behnken design and response surface methodology.•GYH2, TRE and CR could exhibit up to 14.32mmol·gTOC−1, 82.54% and 94.56%.•Small amounts of oxidant can decrease the generation of tar and...

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Bibliographic Details
Published in:Waste management (Elmsford) 2015-09, Vol.43, p.343-352
Main Authors: Gong, Yanmeng, Wang, Shuzhong, Xu, Haidong, Guo, Yang, Tang, Xingying
Format: Article
Language:English
Subjects:
AMMONIA
Ammonia - analysis
CARBON
CARBON DIOXIDE
Carbon Dioxide - analysis
CARBONATES
Carbonates - chemistry
CHARS
China
Combustion
Gas composition
HYDROGEN
Hydrogen - chemistry
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Landfill leachate
Landfills
Leachates
MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
MATERIALS RECOVERY
Models, Theoretical
NITROGEN
Nitrogen - analysis
Optimization
OXIDATION
Oxidation-Reduction
OXIDIZERS
Partial oxidation
POLYNOMIALS
Response surface methodology
SANITARY LANDFILLS
Supercritical water
TAR
Temperature
WATER
Water Pollutants, Chemical - chemistry
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Summary:•Partial oxidation of landfill leachate in supercritical water was investigated.•The process was optimized by Box–Behnken design and response surface methodology.•GYH2, TRE and CR could exhibit up to 14.32mmol·gTOC−1, 82.54% and 94.56%.•Small amounts of oxidant can decrease the generation of tar and char. To achieve the maximum H2 yield (GYH2), TOC removal rate (TRE) and carbon recovery rate (CR), response surface methodology was applied to optimize the process parameters for supercritical water partial oxidation (SWPO) of landfill leachate in a batch reactor. Quadratic polynomial models for GYH2, CR and TRE were established with Box–Behnken design. GYH2, CR and TRE reached up to 14.32mmol·gTOC−1, 82.54% and 94.56% under optimum conditions, respectively. TRE was invariably above 91.87%. In contrast, TC removal rate (TR) only changed from 8.76% to 32.98%. Furthermore, carbonate and bicarbonate were the most abundant carbonaceous substances in product, whereas CO2 and H2 were the most abundant gaseous products. As a product of nitrogen-containing organics, NH3 has an important effect on gas composition. The carbon balance cannot be reached duo to the formation of tar and char. CR increased with the increase of temperature and oxidation coefficient.
ISSN:0956-053X
1879-2456
DOI:10.1016/j.wasman.2015.04.013