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Title: Treatment of desizing wastewater containing poly(vinyl alcohol) by wet air oxidation

Abstract

The effectiveness of wet air oxidation (WAO) is studied in a 2-L autoclave for the treatment of desizing wastewater from man-made fiber textile plants. At an oxygen pressure of less than 2 MPa, over 30-min, chemical oxygen demand (COD) removal was found to increase from 15 to 65% when the temperature was raised from 150 to 250 C. The biodegradability of the wastewater was also simultaneously increased. Up to 90% of the COD could be removed within 120 min. A simplified reaction mechanism is proposed which involves a direct mineralization step in parallel with a step in which an intermediate is formed prior to mineralization. A kinetic model for COD removal was developed based on this reaction mechanism. The model was tested with experimental COD results over the temperature range of the experiments. The dependence of the specific reaction rate constants was found to follow the Arrhenius type of equation. The direct oxidation of poly(vinyl alcohol) (PVA) to carbon dioxide and water is the dominant reaction step. The intermediates formed are not likely to be the acetic acid but may be short segments of PVA that are easily oxidized.

Authors:
; ; ;
Publication Date:
Research Org.:
Hong Kong Univ. of Science and Technology, Kowloon (HK)
OSTI Identifier:
20076070
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 39; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; TEXTILE INDUSTRY; WASTE WATER; PVA; WET OXIDATION PROCESSES; BIODEGRADATION; KINETIC EQUATIONS

Citation Formats

Chen, G., Lei, L., Yue, P.L., and Cen, P. Treatment of desizing wastewater containing poly(vinyl alcohol) by wet air oxidation. United States: N. p., 2000. Web. doi:10.1021/ie990528g.
Chen, G., Lei, L., Yue, P.L., & Cen, P. Treatment of desizing wastewater containing poly(vinyl alcohol) by wet air oxidation. United States. doi:10.1021/ie990528g.
Chen, G., Lei, L., Yue, P.L., and Cen, P. Mon . "Treatment of desizing wastewater containing poly(vinyl alcohol) by wet air oxidation". United States. doi:10.1021/ie990528g.
@article{osti_20076070,
title = {Treatment of desizing wastewater containing poly(vinyl alcohol) by wet air oxidation},
author = {Chen, G. and Lei, L. and Yue, P.L. and Cen, P.},
abstractNote = {The effectiveness of wet air oxidation (WAO) is studied in a 2-L autoclave for the treatment of desizing wastewater from man-made fiber textile plants. At an oxygen pressure of less than 2 MPa, over 30-min, chemical oxygen demand (COD) removal was found to increase from 15 to 65% when the temperature was raised from 150 to 250 C. The biodegradability of the wastewater was also simultaneously increased. Up to 90% of the COD could be removed within 120 min. A simplified reaction mechanism is proposed which involves a direct mineralization step in parallel with a step in which an intermediate is formed prior to mineralization. A kinetic model for COD removal was developed based on this reaction mechanism. The model was tested with experimental COD results over the temperature range of the experiments. The dependence of the specific reaction rate constants was found to follow the Arrhenius type of equation. The direct oxidation of poly(vinyl alcohol) (PVA) to carbon dioxide and water is the dominant reaction step. The intermediates formed are not likely to be the acetic acid but may be short segments of PVA that are easily oxidized.},
doi = {10.1021/ie990528g},
journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 5,
volume = 39,
place = {United States},
year = {2000},
month = {5}
}