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Microwave Heating as a Method to Improve Sanitation of Sewage Sludge in Wastewater Plants
Linköping University, Department of Science and Technology, Physics, Electronics and Mathematics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-4136-0817
Combitech AB, Sweden.
Combitech AB, Sweden.
Combitech AB, Sweden.
2019 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 142308-142316Article in journal (Refereed) Published
Abstract [en]

For long-term sustainable agriculture, it is critical that we recycle nutrition to the soil that it came from. One important source is sewage sludge, but it must be sanitized from undesired pathogens before it may be spread on arable land. One common method today is deposition in about six months or more. Not only is such a long deposition-time costly due to the required storage-space, in the future usage of the method is likely to be more restricted from a regulatory perspective. To heat up sewage-sludge is a known method to speed up the sanitation process. However, achieving an even guaranteed temperature is not easy with porous sewage sludge. This is mainly due to the limited heat conductivity of the sludge. Microwaves at a frequency of 2.45 GHz have a penetration depth of a few centimeters and therefore has an advantage compared to other heating methods which only heats the surface. In the proposed system, the sewage sludge is continuously processed through a series of microwave cavities. The pathogen removal effectiveness was studied for different exposure settings, e.g., conveyor speed and applied microwave power in each cavity.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2019. Vol. 7, p. 142308-142316
Keywords [en]
Electromagnetic heating; Wastewater; Microwave ovens; Microwave technology; Temperature sensors; Biohazard; high power microwave generation; microwave ovens; microwave technology; sanitary engineering; sustainable development; waste handling; wastewater
National Category
Computer Systems
Identifiers
URN: urn:nbn:se:liu:diva-162567DOI: 10.1109/ACCESS.2019.2944210ISI: 000497156000176OAI: oai:DiVA.org:liu-162567DiVA, id: diva2:1376220
Note

Funding Agencies|Norrkoping Foundation for Research and Development

Available from: 2019-12-09 Created: 2019-12-09 Last updated: 2020-01-21

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