Supercritical water oxidation of polyvinyl alcohol and desizing wastewater： Influence of NaOH on the organic decomposition

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 polyvi...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2013-08, Vol.25 (8), p.1583-1591
Main Authors: Zhang, Jie, Wang, Shuzhong, Guo, Yang, Xu, Donghai, Gong, Yanmeng, Tang, Xingying
Format: Article
Language:English
Subjects:
acetaldehyde
carbon
catalysis
chemical bonding
desizing wastewater
industry
NaOH
neutralization
organic acids and salts
Organic Chemicals - chemistry
oxidation
Oxidation-Reduction
polyvinyl alcohol
Polyvinyl Alcohol - chemistry
sodium hydroxide
Sodium Hydroxide - chemistry
supercritical water oxidation
Waste Water - chemistry
wastewater
Water - chemistry
Water Pollutants, Chemical - chemistry
water treatment
俘获反应
分解
氢氧化钠
聚乙烯醇溶液
超临界水处理
超临界水氧化
退浆废水
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Summary: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.
ISSN:1001-0742
1878-7320
DOI:10.1016/S1001-0742(9)60193-4