Hydrogen generation from polyvinyl alcohol-contaminated wastewater by a process of supercritical water gasification

作者：Yan Bo; Wei Chao hai^*; Hu Cheng sheng; Xie Cheng; Wu Jun zhang

来源：Journal of Environmental Sciences, 2007, 19(12): 1424-1429.

DOI：10.1016/S1001-0742(07)60232-0

• hydrogen generation
• supercritical water
• gasification
• polyvinyl alcohol wastewater

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, and TOC analyzer. The main gas products were H-2, 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 (R-TOC), carbon gasification ratio (R-CG) and hydrogen gasification ratio (R-HG) 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.

• 出版日期2007
• 单位华南理工大学