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

Journal Article · Mon May 01 04:00:00 EDT 2000 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie990528g· OSTI ID:20076070

Chen, G; Lei, L; Yue, P L; Cen, P

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.

• Research Organization: Hong Kong Univ. of Science and Technology, Kowloon (HK)
• OSTI ID: 20076070
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 5 Vol. 39; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
BIODEGRADATION
KINETIC EQUATIONS
PVA
TEXTILE INDUSTRY
WASTE WATER
WET OXIDATION PROCESSES