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Open AccessArticle

Water Quality Study on the Hot and Cold Water Supply Systems at Vietnamese Hotels

Department of Environmental Science, International College of Arts and Science, Fukuoka Women’s University, Kasumigaoka, Higashi-ku, Fukuoka 813-8529, Japan
Urban Institute & Departments of Urban and Environmental Engineering, School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
Water and Lifestyle Research Laboratory, 31-3, Munakata, Fukuoka 811-4141, Japan
Author to whom correspondence should be addressed.
Academic Editor: Enedir Ghisi
Water 2017, 9(4), 251;
Received: 14 December 2016 / Revised: 3 March 2017 / Accepted: 8 March 2017 / Published: 3 April 2017
This study was conducted as part of the Joint Crediting Mechanism (JCM) of the Japanese Ministry of Economy, Trade and Industry, and the Ministry of the Environment project’s preparation in Vietnam. Samples were taken from hot and cold water supplies from guest rooms’ faucets in 12 hotels in Hanoi city, Vietnam, and 13 hotels in Japan for comparison. A simple water quality measurement and determination of Legionella was carried out. The results showed that residual effective chlorine—which guarantees bactericidal properties—was not detected in tap water supplied in hotel rooms in Vietnam, and nitrite (an indicator of water pollution) was detected in 40% of buildings. In the hotels in Japan, the prescribed residual chlorine concentration met the prescribed levels, and nitrite was not detected. Additionally, while there was no Legionella detected in the Japanese cases, it was detected in most of the Vietnamese hotels, which were found to manage the hot water storage tank at low temperatures of 40–50 °C. It was found that there were deficiencies in cold and hot water supply quality, and that there was no effective system in place for building operation maintenance and management. View Full-Text
Keywords: water saving; water quality; Legionella; Vietnamese hotel water saving; water quality; Legionella; Vietnamese hotel
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Toyosada, K.; Otani, T.; Shimizu, Y.; Managi, S. Water Quality Study on the Hot and Cold Water Supply Systems at Vietnamese Hotels. Water 2017, 9, 251.

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