| Supercritical water oxidation of polyvinyl alcohol and desizing wastewater：Influence of NaOH on the organic decomposition |
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| 引用本文： | Jie Zhang,Shuzhong Wang,Yang Guo,Donghai Xu,Yanmeng Gong,Xingying Tang. Supercritical water oxidation of polyvinyl alcohol and desizing wastewater：Influence of NaOH on the organic decomposition[J]. 环境科学学报(英文版), 2013, 25(8): 1583-1591. DOI: 10.1016/S1001-0742(9)60193-4 |
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| 作者姓名： | Jie Zhang Shuzhong Wang Yang Guo Donghai Xu Yanmeng Gong Xingying Tang |
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| 作者单位： | Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China |
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| 基金项目： | the National High Technology Research and Development Program of China，the Program for New Century Excellent Talents in University of Chinese Education Ministry，the Opened Fund of Jiangsu Key Lab for Clean Energy and Power Machinery Engineering |
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| 摘 要： | Polyvinyl alcohol is a refractory compound widely used in industry. Here we report supercritical water oxidation of polyvinyl alcohol solution and desizing wastewater with and without sodium hydroxide addition. However, it is difficult to implement complete degradation of organics even though polyvinyl alcohol can readily crack under supercritical water treatment. Sodium hydroxide had a significant catalytic effect during the supercritical water oxidation of polyvinyl alcohol. It appears that the OH ion participated in the C-C bond cleavage of polyvinyl alcohol molecules, the CO2-capture reaction and the neutralization of intermediate organic acids, promoting the overall reactions moving in the forward direction. Acetaldehyde was a typical intermediate product during reaction. For supercritical water oxidation of desizing wastewater, a high destruction rate (98.25%) based on total organic carbon was achieved. In addition, cases where initial wastewater was alkaline were favorable for supercritical water oxidation treatment, but salt precipitation and blockage issues arising during the process need to be taken into account seriously.
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| 关 键 词： | supercritical water oxidation polyvinyl alcohol sodium hydroxide catalysis desizing wastewater |
| 收稿时间： | 2012-10-23 |
| 修稿时间： | 2012-12-06 |
Supercritical water oxidation of polyvinyl alcohol and desizing wastewater:Influence of NaOH on the organic decomposition |
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| Jie Zhang,Shuzhong Wang,Yang Guo,Donghai Xu,Yanmeng Gong and Xingying Tang. Supercritical water oxidation of polyvinyl alcohol and desizing wastewater:Influence of NaOH on the organic decomposition[J]. Journal of environmental sciences (China), 2013, 25(8): 1583-1591. DOI: 10.1016/S1001-0742(9)60193-4 |
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| Authors: | Jie Zhang Shuzhong Wang Yang Guo Donghai Xu Yanmeng Gong Xingying Tang |
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| Affiliation: | Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China |
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| Abstract: | Polyvinyl alcohol is a refractory compound widely used in industry. Here we report supercritical water oxidation of polyvinyl alcohol solution and desizing wastewater with and without sodium hydroxide addition. However, it is difficult to implement complete degradation of organics even though polyvinyl alcohol can readily crack under supercritical water treatment. Sodium hydroxide had a significant catalytic effect during the supercritical water oxidation of polyvinyl alcohol. It appears that the OH- ion participated in the C-C bond cleavage of polyvinyl alcohol molecules, the CO2-capture reaction and the neutralization of intermediate organic acids, promoting the overall reactions moving in the forward direction. Acetaldehyde was a typical intermediate product during reaction. For supercritical water oxidation of desizing wastewater, a high destruction rate (98.25%) based on total organic carbon was achieved. In addition, cases where initial wastewater was alkaline were favorable for supercritical water oxidation treatment, but salt precipitation and blockage issues arising during the process need to be taken into account seriously. |
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| Keywords: | supercritical water oxidation polyvinyl alcohol sodium hydroxide catalysis desizing wastewater |
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