Advanced Oxidation Process Using Hydrogen Peroxide/ Microwave System for Solubilization of Phosphate

An advanced oxidation process (AOP) combining hydrogen peroxide and microwave heating was used for the solubilization of phosphate from secondary municipal sludge from an enhanced biological phosphorus removal process. The microwave irradiation is used as a generator agent of oxidizing radicals as well as a heating source in the process. This AOP process could facilitate the release of a large amount of the sludge-bound phosphorus from the sewage sludge. More than 84% of the total phosphorous could be released at a microwave heating time of 5 min at 170°C. This innovative process has the potential of being applied to simple sludge treatment processes in domestic wastewater treatment and to the recovery of phosphorus from the wastewater.

Keywords:

• Advanced oxidation process
• Hydrogen peroxide
• Microwave heating
• Phosphorous release
• Sludge

ACKNOWLEDGMENTS

We acknowledge the research funding provided by the Natural Science and Engineering Research Council of Canada.

Notes

*Set 1 experiment performed with n = 5 replicates; set 2 experiments performed with n = 3 replicates.