Ultrasound Disinfection in Domestic Drinking Water System
F.A. Floriana Ayumurti Kukuh (TU Delft - Civil Engineering & Geosciences)
Luuk C. Rietveld – Mentor (TU Delft - Sanitary Engineering)
G Liu – Graduation committee member (TU Delft - Sanitary Engineering)
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Abstract
The quality of treated drinking water in the distribution network might deteriorate even though the quality of water leaving the treatment plant has been set to be at the highest level. Regrowth of microorganisms or known as microbiological instability is found to be one of the responsible causes for the change of the water quality. This instability might also occur in household connections due to the higher temperature, longer residence time, and the possibility of mixing with contaminated water from the household. However, chlorination is not desired to be applied in the treatment process, especially in the Netherlands. Moreover, the Dutch future heating system will be replaced with a heat pump system where the temperature of the water will be estimated at around 40°C, as it is a comfortable temperature for showering. Whilst, the hot water supply system in current situation heats the water until around 60°C and then is combined with cold water until it reaches the comfortable temperature. The future heating system will enhance the risk of microbial contamination since the temperature is within the range where Legionella can survive. Ultrasound disinfection emerges as a solution as it offers a physical disinfection method, which does not change the quality of the water chemically. According to this opportunity and the risk of bacterial regrowth in the household connection, an investigation on the efficacy of ultrasound disinfection in microbial growth control in the household is desired. At the end of this research, an experimental set-up and research plan are established to investigate the efficacy of ultrasound disinfection for microbial growth control in household water system provide water of 40°C.