Hydrogen generation from polyvinyl alcohol-contaminated wastewater by a
process of supercritical water gasification |
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Authors: | YAN Bo WEI Chao-hai HU Cheng-sheng XIE Cheng and WU Jun-zhang |
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Institution: | College of Environmental Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China |
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Abstract: | Gasification of polyvinyl alcohol (PVA)-contaminated wastewater in supercritical water (SCW) was investigated in a continuous flow reactor at 723-873 K, 20-36 MPa and residence time of 20-60 s. The gas and liquid products were analyzed by GC/TCD, TOC analyzer and GC/MS. The main gas products were H2, CH4, CO and CO2. Pressure change had no significant influence on gasification efficiency. Higher temperature and longer residence time enhanced gasification efficiency, and lower temperature favored the production of H2. The effects of KOH catalyst on gas product composition were studied, and gasification efficiency were analyzed. The TOC removal efficiency (TOCR), carbon gasification ratio (CGR) and hydrogen gasification ratio (HGR) were up to 96.00%, 95.92% and 126.40% at 873 K and 60 s, respectively, which suggests PVA can be completely gasified in SCW. The results indicate supercritical water gasification for hydrogen generation is a promising process for the treatment of PVA wastewater. |
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Keywords: | hydrogen generation supercritical water gasification polyvinyl alcohol wastewater gasification supercritical water process wastewater generation results promising treatment hydrogen carbon removal efficiency effects catalyst product composition lower temperature production Pressure significant influence analyzer |
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