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Factors affecting nutrient solubilization from sewage sludge using microwave-enhanced advanced oxidation process.

Wayne T Wong¹, K Victor Lo, Ping H Liao

¹Department of Civil Engineering, University of British Columbia, Vancouver, BC, Canada.

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering

|May 3, 2007

Summary

Microwave-enhanced advanced oxidation process effectively solubilized phosphate and ammonia from sewage sludge. Key factors influencing phosphorus recovery included microwave temperature, heating time, and hydrogen peroxide addition.

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Area of Science:

Environmental Science
Chemical Engineering
Water Treatment

Background:

Secondary municipal sludge contains valuable nutrients like phosphate and ammonia.
Nutrient recovery from sludge is crucial for sustainable resource management and reducing environmental pollution.

Purpose of the Study:

To investigate the solubilization of phosphate and ammonia from secondary municipal sludge using a microwave-enhanced advanced oxidation process (MW-H2O2-AOP).
To identify the key factors influencing nutrient solubilization, particularly phosphorus recovery.

Main Methods:

A microwave-enhanced advanced oxidation process (MW-H2O2-AOP) was employed.
Experiments involved varying microwave heating temperature, heating time, hydrogen peroxide addition, and sulfuric acid treatment.
A screening design was used to assess the significance of these factors.

Main Results:

Microwave heating temperature was the most significant factor for phosphorus solubilization.
The combined effect of microwave heating temperature and hydrogen peroxide addition also significantly impacted phosphorus recovery.
Sulfuric acid addition was another important factor influencing nutrient solubilization.

Conclusions:

The MW-H2O2-AOP is a viable method for solubilizing phosphate and ammonia from municipal sludge.
Optimizing microwave temperature, heating time, and chemical additions is key for efficient nutrient recovery.