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The Pasteurization of Tap Water

Printed From: Dairy Science and Food Technology
Category: Thermal processing
Forum Name: Thermal processing
Forum Description: Effects of heat on food, enzymes and microorganisms
Printed Date: 02 Dec 2020 at 3:10pm
Software Version: Web Wiz Forums 12.03 -

Topic: The Pasteurization of Tap Water
Posted By: Guests
Subject: The Pasteurization of Tap Water
Date Posted: 22 Mar 2010 at 11:05pm
In some developed countries, people drink tap water directly. However, Chinese people enjoy drinking boiled water, partly because we like drinking tea, which is prepared with hot water. But the most important reason is that it is believed that there may be some harmful micro-organisms in tap water.

Boiling water can cost a lot of energy, Chinese people are used to boil water to 100C, which is believed as the safe point.

I have noticed some principles, which may be reduce the energy cost of preparing drinking water.

1. The boiling water will be cool to about 70C soon after be boiled.
2. The pasteurization can kill harmful micro-organisms effectively.
3. Heat-exchange could reduce the energy cost.

So, I plan to design an Eco-boiler for Chinese family.

First, take a common electrical water boiler, adding heat preservation rind onto it. The boiler will be off at about 70C. Then, keep the temperature for a couple of minutes, pasteurization can kill harmful micro-organisms. The water is still hot after pasteurization, so it could be used to preparing tea.

In addition, people who would like to drink cool boiled water may employ a heat-exchanger to reduce energy cost. I think the most easy method is to connect two boiler, adding heat preservation rind onto them but there is not heat preservation layer between the two boiler, when one is full of 70C hot water, adding cool tap water to another boiler, which is gain heat from the former.

How do you think about this idea?

I must find out the Temperature-Time factor of Pasteurization for tap water, and how much energy would be saved by this technology.


Posted By: Guests
Date Posted: 22 Mar 2010 at 11:05pm
Welcome back Tong!

I hope that you have been enjoying the games?

Sorry not really a topic for me to respond to. I wish you well however. I know one or two engineers that may comment.



Posted By: Guests
Date Posted: 22 Mar 2010 at 11:05pm
Yeah, I watch the games on TV every day, China take many metals this time, but I cannot go to Beijing.

Thank you all the same!

I get this idea from the pasteurization of milk,

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