Dear M Jalili, let me answer ...
Published by Igor Dundovic
Dear M Jalili, let me answer some of your questions.
1. European Union has it's own legislation regarding drinking water quality. The Drinking Water Directive (Council Directive 98/83/EC of 3 November 1998 on the quality of water intended for human consumption) concerns the quality of water intended for human consumption. You can easily search online for all the parameters, explanations, etc.
2. Drinking water business is one of most growing businesses in the world today. As everything is driven by the money, so is this topic. If we calculate good investment return period and economic benefit, there would be investors interested in this solution. But, I remember a case from some decade or two ago, when an automobile tires company put into market a non-inflation car tire which cant blow as there is no air in it. But, it didn't find its place on market as tire services didn't have equipment for it's installation, didn't want to invest in it - train it's stuff, etc., and the idea broke down. I see your case similar to the tire example I gave. There need to be a huge change in domestic installation services provided by plumbers, big change in utility companies, and so on. But again, if there is a good case for it, if water production price is high enough so you can make big savings and afford doubling the network, why not.
3. No :)
Best regards and please continue whit this kind of interesting discussions.
1 Comment
Dear Igor,
Many thanks for your interesting answer.
It should be noted that dual water system is not necessarily dual water network.
In the case that quality of available water does not meet required standard of drinking water but can be accepted for other domestic consumption (e.g. bathing, dishwashing, …) people may use bottled water or take drinking water from local water kiosks, or may use domestic water treatment plant to provide water for their drinking (and perhaps cooking) need. In all mentioned cases drinking water is separated from other domestic consumption by a "non-conventional dual water system".
Based on this definition, many cities and villages use non-conventional dual water system. For example in some cities and villages in Asia and Africa, where TDS or Nitrate level of network water is higher than the drinking standard value, drinking water is distributed by local water kiosks and the lower-quality water of main pipe network is used for other domestic consumption (e.g. bathing, dishwashing, …). In this case, main concern is not about drinking water but about using the non-drinking part which obviously doesn’t have quality of water drinking standard (e.g. WHO Guidelines for Drinking-water Quality, 2011).
Suppose people take shower with water which has high level of Nitrate or TDS value, is it dangerous for their health in short or long time? Does any standard of water quality exist for this? Same questions exist about water quality of dishwashing.
Published by M Jalili