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Pilot-scale peroxidation (H2O2) of sewage sludge
E Neyens1, J Baeyens, M Weemaes
1Department of Chemical Engineering, Katholieke Universiteit Leuven, de Croylaan 46, 3001 Heverlee, Belgium. elisabeth.neyens@cit.kuleuven@ac.be
Journal of Hazardous Materials
|March 12, 2003
Summary
Fenton's reagent pre-treatment significantly reduces sludge volume and improves dewaterability. This process offers substantial cost savings for wastewater treatment plants, making sludge disposal more efficient.
Area of Science:
- Environmental Engineering
- Chemical Engineering
Background:
- Wastewater treatment plants generate significant sludge volumes, posing disposal challenges.
- Improving sludge dewaterability and reducing overall sludge production are critical for efficient waste management.
Purpose of the Study:
- To evaluate the effectiveness of Fenton's reagent (H2O2 oxidation catalyzed by iron salts) as a pre-treatment for sludge.
- To optimize the conditions for H2O2-oxidation of sludge and assess its impact on dewatering and volume reduction.
Main Methods:
- Pilot-scale experiments were conducted using optimized conditions from laboratory tests.
- Sludge pre-treatment involved catalytic oxidation with hydrogen peroxide (H2O2) and iron (II) salts at specific dosages, pH, and ambient conditions.
Main Results:
- Optimized Fenton's reagent pre-treatment reduced dry solids (DS) per equivalent inhabitant per day from 60 to 33.1 g DS/IE.d.
- Sludge cake dewaterability improved significantly, achieving 47% DS compared to 20-25% in traditional methods.
- Economic assessment indicated potential net savings of approximately 950,000 Euro per year for a 300,000 IE plant.
Conclusions:
- Fenton's reagent pre-treatment is a viable and cost-effective method for sludge volume reduction and enhanced dewatering.
- The process offers significant economic benefits through reduced disposal costs and improved sludge handling.