Effect of the Cleanliness of Spray Nozzle on the Concentration of Microorganisms in the Spray Water in Warm-Water Bidet Toilet Seats.

IF 0.9 4区 农林科学 Q4 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Toru Iyo, Keiko Asakura, Kazuyuki Omae
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引用次数: 0

Abstract

Bidet-toilets are widely used in households and public spaces in Japan. The effect of nozzle cleanliness on spray water quality of warm-water bidet toilet seats is unknown. We conducted a long-term experimental model-based study (2015-2016) and two survey-based studies (A: 2018-2019 and B: 2020-2021) at a university campus. Survey A measured the effect of nozzle cleansing on total viable count (TVC) and heterotrophic plate counts (HPCs) in spray water. Survey B measured the total organic carbon, residual chlorine concentration, TVC, and HPC of different fractions of sprayed water. We found no upstream migration of microbes from the nozzle to water tanks. While daily cleaning of the nozzle surface could reduce bacterial count in spray water, continuous discharge of water washed away bacterial contamination. Fecal indicator bacteria were in traces in spray water, indicating proper maintenance of these toilet seats.

喷头清洁度对温水坐浴盆座圈喷雾水中微生物浓度的影响
在日本,坐浴盆式厕所在家庭和公共场所被广泛使用。喷头清洁度对温水坐浴盆坐便器喷淋水质的影响尚不清楚。我们在某大学校园进行了一项基于长期实验模型的研究(2015-2016)和两项基于调查的研究(a: 2018-2019和B: 2020-2021)。调查A测量了喷嘴清洗对喷雾水中总活菌数(TVC)和异养板数(HPCs)的影响。调查B测量了不同馏分喷洒水的总有机碳、余氯浓度、TVC和HPC。我们没有发现微生物从喷嘴上游迁移到水箱。每天清洗喷嘴表面可以减少喷雾水中的细菌数量,连续的放水可以冲走细菌污染。在喷雾水中发现了粪便指示细菌,说明马桶座圈得到了适当的维护。
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来源期刊
Biocontrol science
Biocontrol science BIOTECHNOLOGY & APPLIED MICROBIOLOGY-
CiteScore
2.60
自引率
8.30%
发文量
21
审稿时长
>12 weeks
期刊介绍: The Biocontrol Science provides a medium for the publication of original articles, concise notes, and review articles on all aspects of science and technology of biocontrol.
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