关键词: reaction kinetic;textile wastewater;wet air oxidation;wastewater treatment

Abstract: This work described the application of wet air oxidation (WAO) to the treatment of desizing
wastewater from natural fiber processing. A two-liter autoclave batch reactor was used for
the experiments. The range of operating temperature examined was between 150 and 290℃, and
partial pressure of oxygen ranged from 0.375 to 2.25 MPa standardized at 25℃. Variations
in Chemical Oxygen Demand(COD) and Total Organic Carbon(TOC) were monitored during each
experiment and used to assess the performance of the process. Experimental results showed
that WAO can be an efficient method for the treatment of desizing wnstewater. Furthermore,
Catalytic Wet Air Oxidation (CWAO) was applied to reduce the reaction temperature and
pressure in WAO process. A higher COD removal ratio was achieved under more mild reaction
condition with the aid of CWAO. A mathematical model was also proposed to simulate the WAO
process of desizing wastewater, in which three distinct kinetics steps were considered to
describe the degradation of starch. The model simulations were in well agreement with the
experimental data.

Key words: reaction kinetic, textile wastewater, wet air oxidation, wastewater treatment