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Reduktion av mikroorganismer i diskmaskiner  med vattenånga.
2017 (Swedish)Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
Abstract [en]

Bacteria are a type of microorganism that causes several kinds of problems in dishwashers, one problem being that the bacteria create strong and difficult smells. Bacteria arise from the fact that food residue on the dirt tray serves as nutrition for the bacteria for a long time. To minimize the bad smell, use a dishwashing program with hot water and usually a dishwasher detergent. This is independent of the amount of dirty disk actually in the dishwasher. It will be both a cost issue and an environmental issue through a waste of natural resources. The optimum is a solution that is directly aimed at removing and reducing existing microorganisms on the counter as well as in the dishwasher that does not use machine dishwashing and minimal water and electricity. This then does not need a more intensive program. The purpose of the study is to show how hot steam can be used to reduce the amount of bacteria on the dirty disk.The method used to test the reliability of the vapor treatment system was to use a solution of yeast cells with sodium chloride which had grown into a 24-hour heat sink in a pressure plate with agar solution used as a yeast cell feed. Then they were brought into a specially configured dishwasher where hot steam was injected into the system to work to reduce the bacteria on the plates.The number of microorganisms was compared before and after the treatment of the vapor. The tests were conducted until there was a clear connection between water use, the time of steam treatment and the reduction of yeast cells. This continued until a 95 percent reduction of microorganisms had been achieved throughout the dishwasher regardless of where the contaminated plates were located.The conclusion is that the steam treatment was more expensive than the existing technology, and the dishwasher needed to be supplemented by a method of heating the water to 100 °C. A simple rinse with hot water gave similar results and was cheaper and easier as the machines were already equipped with such a functionThere is a market for the steam method, as the method is especially interesting for individuals with additional disinfection needs, for example for people with poor immune system.

Place, publisher, year, edition, pages
2017. , p. 38
Keywords [sv]
Diskmaskin, vattenånga, bakteriereduktion
National Category
Energy Systems Energy Engineering
Identifiers
URN: urn:nbn:se:kau:diva-65329OAI: oai:DiVA.org:kau-65329DiVA, id: diva2:1163067
External cooperation
Asko Appliances AB
Subject / course
Ecophilosophy
Educational program
Bachelor of Science in Enviromental and Energy Engineering, 180 hp
Presentation
2017-05-31, Rejmer 9C204, Universitetsgatan 2, Karlstad, 11:50 (Swedish)
Supervisors
Examiners
Available from: 2017-12-06 Created: 2017-12-05 Last updated: 2017-12-06Bibliographically approved

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Energy SystemsEnergy Engineering

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CiteExportLink to record
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Citation style
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