title: Hydrogen generation from polyvinyl alcohol-contaminated wastewater by a process of supercritical water gasification.
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, and TOC analyzer. 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 (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.
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, Guangdong 510640, China. yanbo2007@163.com
authors.forename: Bo
authors.initials: B
authors.lastname: Yan
authors.forename: Chao-hai
authors.initials: CH
authors.lastname: Wei
authors.forename: Cheng-sheng
authors.initials: CS
authors.lastname: Hu
authors.forename: Cheng
authors.initials: C
authors.lastname: Xie
authors.forename: Jun-zhang
authors.initials: JZ
authors.lastname: Wu
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry; D002248:Carbon Monoxide / Q000737:chemistry; D002384:Catalysis; D003246:Conservation of Energy Resources / Q000379:methods*; D006859:Hydrogen / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry; D008697:Methane / Q000737:chemistry; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D017680:Potassium Compounds / Q000737:chemistry; D011312:Pressure; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006878:Hydroxides; D017680:Potassium Compounds; D014874:Water Pollutants, Chemical; D014867:Water; D002245:Carbon Dioxide; D002248:Carbon Monoxide; D006859:Hydrogen; D011142:Polyvinyl Alcohol; D008697:Methane; C029943:potassium hydroxide