A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development of programmes to investigate the antimicrobial efficacy of domestic dishwashers
Dishwashers have undergone a drastic change both in design and programme variation since their conception. Trends in water and energy conservation, as well as the public perception of topics such as environment protection, have pushed for a dishwashing service that delivers highly efficient cleaning while remaining ecologically friendly. Over the years, different methods have been used to assess the combined effects of different factors that play a role in the antimicrobial efficacy of domestic dishwashers. However, the extent of their individual capabilities remained unknown, as no factor could be tested separately with the commercially available settings. With the aid of a dishwasher with programmable parameters, a method was developed that would allow for the testing of the different factors in a way that separates their microbicidal activities from one another as much as possible. The work of cleaning agents was excluded from any trials, as they are expected to only benefit the microbial reduction. Furthermore, the methodology used in this thesis work presents an opportunity to investigate the energy consumption levels of different steps in traditional dishwashing processes and find potential targets for future reduction in water and energy usage. The study discovered that mechanical action, water quantity and the duration of the main cleaning cycle induce an equal reduction of around 4 logarithmic steps, when tested at room temperature. The main source of energy consumption during these experiments was found to be the spray arm pump with values 0.06 and 1.27 Wh per minute for the lowest and highest setting tested, respectively. The temperature increases caused the largest change in both logarithmic reduction and energy consumption. The highest achieved logarithmic reduction occurred during tests with a cleaning temperature of 75 ℃, with the value being roughly doubled to that of the tests at room temperature. The energy consumption values also drastically increase to a mean of 37 Wh during the heating part ...
Development of programmes to investigate the antimicrobial efficacy of domestic dishwashers
Dishwashers have undergone a drastic change both in design and programme variation since their conception. Trends in water and energy conservation, as well as the public perception of topics such as environment protection, have pushed for a dishwashing service that delivers highly efficient cleaning while remaining ecologically friendly. Over the years, different methods have been used to assess the combined effects of different factors that play a role in the antimicrobial efficacy of domestic dishwashers. However, the extent of their individual capabilities remained unknown, as no factor could be tested separately with the commercially available settings. With the aid of a dishwasher with programmable parameters, a method was developed that would allow for the testing of the different factors in a way that separates their microbicidal activities from one another as much as possible. The work of cleaning agents was excluded from any trials, as they are expected to only benefit the microbial reduction. Furthermore, the methodology used in this thesis work presents an opportunity to investigate the energy consumption levels of different steps in traditional dishwashing processes and find potential targets for future reduction in water and energy usage. The study discovered that mechanical action, water quantity and the duration of the main cleaning cycle induce an equal reduction of around 4 logarithmic steps, when tested at room temperature. The main source of energy consumption during these experiments was found to be the spray arm pump with values 0.06 and 1.27 Wh per minute for the lowest and highest setting tested, respectively. The temperature increases caused the largest change in both logarithmic reduction and energy consumption. The highest achieved logarithmic reduction occurred during tests with a cleaning temperature of 75 ℃, with the value being roughly doubled to that of the tests at room temperature. The energy consumption values also drastically increase to a mean of 37 Wh during the heating part ...
Development of programmes to investigate the antimicrobial efficacy of domestic dishwashers
Yotov, Nikola Vladislavov (author)
2022-03-07
Theses
Electronic Resource
English
DDC:
690
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