Aquatic environment

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


YAN Bo , WEI Chao-hai , HU Cheng-sheng , XIE Cheng , WU Jun-zhang

DOI:

Received February 10, 2007,Revised April 04, 2007, Accepted , Available online

Volume 19,2007,Pages 1424-1429

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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 H2, CH4, CO and CO2. Pressure change had no significant influence on gasification e ciency. Higher temperature and longer residence time enhanced gasification e ciency, 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 (RTOC), carbon gasification ratio (RCG) and hydrogen gasification ratio (RHG) 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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