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Ventilation of potable water concrete storage reservoir

Ventilation of potable water concrete storage reservoir

Ventilation of potable water concrete storage reservoir

(OP)
I'm looking for guidelines about ventilation of potable water storage facilities as concrete reservoirs (ex: natural or powered?, if natural: how many pipe exits per square meter? if powered: how many air changement per hour?, etc.)

Thanks.

RE: Ventilation of potable water concrete storage reservoir

I never saw such type of installation so far, nor I heard. Having said that I don't totally strike out the idea. What we generally do is to check the oxygen percentage before entering the water storage tanks (infact any confined spaces). It should be minimum 19%. An open manhole is just sufficient unless your tank is too deep.

Regards,

RE: Ventilation of potable water concrete storage reservoir

Michel11,

I believe that you are talking about a clear water cistern that is used to store water in between treating it and pumping it up to mains pressure so that your water towers do not have to be rather huge. Am I correct?

You probably could get away with a wind turbine ventilator as far as maintaining oxygen level for when somebody opens the manhole to peek inside and take a water sample with a long instrument. You could also use radon exhaust blowers but for the energy expenditure you might as well aerate the water. If you only need ventilation for infrequent inspection then you could use an electrical outlet for a portable blower that provides 3 air changes in a reasonable amount of time

If you want to keep up the dissolved oxygen content of the water then a modest regenerative blower or small air compressor could be used to aerate the water. The leftover oxygen will contribute to lesser ventilation time before doing an inspection. Rotron and Gast are 2 manufacturers of blowers and air compressors in the capability range that you need.

You could go over to www.h2o2.com and download U.S. Peroxides white papers and data sheets on using hydrogen peroxide in combination with chlorine to fully disinfect water against cryptosporidium and so forth. If you initially treat with hydrogen peroxide plus a trivalent iron catalyst and flocculant such as ferric chloride or sulfate you can get rid of man-made and natural organic compounds that tend to ruin the taste of water. It only takes about 0.4 parts per BILLION of trichlorophenol to make drinking water taste like it was used to hose down a coke oven. Once the organics are oxidized you would then disinfect with chlorine with essentially zero worries about generating chloroform or other carcinogens. If you then do a third treatment with hydrogen peroxide you would bump up the dissolved oxygen content of the water for more shelf life in your clear water cistern and water towers.

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