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UV Treatment versus peak demand

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JeffNY

Civil/Environmental
Mar 5, 2010
2
It has been a while since my days in private consulting that I worked on small water systems. Now I'm in the public sector but am helping designing a small system for a park.

This is a non-community water system (2,030 gpd) and I am trying to apply a UV treatment system to provide 4-log virus removal. The Health Department has determined that the groudnwater well may be under influence from surface water (GUDI), hence the UV treatment. The difficulty I am having is sizing an appropriate UV treatment system and where to place it.

Average daily demand is 3-4 gpm (for 12 or 8 hour day). The system serves one building that will hosue a conference center for 200 people (no kitchen for cooking, catered and simple kitchen needs). The project architect has projected 100 fixtures units in the building and a peak demand of 67 gpm at 45 psi (flushometer needs).

My thought was to put the UV treatment betwen the well and hydropneumatic tank to "mask" the UV from the peak demand. Well yield was 5+ gpm with pump sized accordingly. This way, the filtration-UV only passes the 5-8 gpm from the well pump and I could add storage tank volume beyond the hydropneumatic tank to deal with the instantaneous 67 gpm.

As an aside, I would also inject chlorine after the UV to have a system residual, with some CT log removal bonus but the storage tanks are not sized for chlorine contact time for 4-log exclusively.

Does this sound viable?

Insights and ideas are appreciated.
 
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