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Factors affecting microwave-enhanced advanced oxidation process for sewage sludge treatment
Anju A Kenge1, Ping H Liao, Kwang V Lo
1Department of Civil Engineering, University of British Columbia, Vancouver, BC, Canada.
Summary
Microwave-enhanced advanced oxidation process (MW/H(2)O(2)-AOP) effectively solubilizes nutrients and disintegrates sewage sludge. Optimal results for solids disintegration and nutrient release were achieved at 120°C with 0.80 g H(2)O(2)/g dry sludge.
Area of Science:
- Environmental Engineering
- Chemical Engineering
- Water Treatment Technologies
Background:
- Sewage sludge treatment presents challenges in nutrient solubilization and solids disintegration.
- Advanced oxidation processes offer potential solutions for sludge management.
- Microwave-enhanced processes can improve efficiency and reduce treatment times.
Purpose of the Study:
- To investigate the efficacy of microwave-enhanced advanced oxidation process (MW/H(2)O(2)-AOP) for sewage sludge treatment.
- To identify key operational parameters influencing nutrient solubilization and solids disintegration.
- To determine optimal conditions for maximizing sludge disintegration and nutrient release.
Main Methods:
- A screening experiment was conducted to evaluate the significance of four factors: temperature, hydrogen peroxide dosage, mixing, and solids concentration.
- The MW/H(2)O(2)-AOP was applied to sewage sludge under varying conditions.
- Orthophosphate, ammonia, soluble chemical oxygen demand (SCOD), and volatile fatty acids (VFA) were measured to assess process performance.
Main Results:
- Temperature and hydrogen peroxide dosage were identified as the most significant factors affecting the overall process.
- Temperature significantly influenced orthophosphate release, while hydrogen peroxide dosage was crucial for ammonia release.
- Solids disintegration (SCOD) was highly dependent on temperature and hydrogen peroxide dosage.
- Mixing significantly impacted volatile fatty acids (VFA) release, with higher temperatures and mixing leading to more VFA in the headspace.
Conclusions:
- The MW/H(2)O(2)-AOP is an effective method for sewage sludge treatment, promoting nutrient solubilization and solids disintegration.
- Optimal performance, characterized by maximum solids disintegration and nutrient release, was achieved at 120°C and 0.80 g H(2)O(2)/g dry sludge.
- Understanding the influence of operational parameters is crucial for optimizing sludge treatment using this advanced oxidation process.
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