Kinetics of pulp mill effluent treatment by ozone-based processes
Chun-Han Ko1, Po-Hung Hsieh, Meng-Wen Chang
1School of Forestry and Resource Conservation, National Taiwan University, Section 4, Taipei 106, Taiwan.
Journal of Hazardous Materials
|March 24, 2009
Summary
Advanced oxidation processes effectively treat pulping wastewater. Ozonation with activated carbon significantly enhances chemical oxygen demand (COD) and color removal by regenerating the carbon during treatment.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Chemical Oxidation Processes
Background:
- Pulping and paper production generate wastewaters with high chemical oxygen demand (COD) and color.
- Traditional biological and physicochemical treatments struggle to meet stringent discharge standards.
- Advanced oxidation processes (AOPs) are emerging as effective polishing treatments for industrial effluents.
Purpose of the Study:
- To evaluate various ozone-based AOPs for treating simulated hardwood Kraft pulping black liquor wastewater.
- To investigate the efficacy of direct ozonation, ozonation with activated carbon, and ozonation with hydrogen peroxide.
- To develop kinetic models for predicting COD and color removal rates in ozone-based treatment systems.
Main Methods:
- Simulated wastewater prepared from hardwood Kraft pulping black liquor was treated using different ozone-based processes.
- Evaluated direct ozone oxidation, ozonation combined with activated carbon adsorption, and ozonation with hydrogen peroxide addition.
- Developed and applied kinetic models to analyze the removal rates of COD and color.
Main Results:
- Direct ozone oxidation and activated carbon adsorption were primary methods for COD and color removal.
- Activated carbon addition significantly enhanced both COD and color removal during ozonation.
- Hydrogen peroxide addition improved color removal but had a lesser impact on COD removal compared to activated carbon.
Conclusions:
- Ozonation in the presence of activated carbon offers superior COD and color removal for pulping wastewater.
- The enhanced performance is attributed to the synergistic effect of ozonation and activated carbon regeneration.
- Developed kinetic models provide a valuable tool for designing and optimizing ozone-based treatment reactors for pulping effluents.
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