Call for treatment options for pond-to-potable water supply 1

[Hoagie]

I have a client who'd like to explore the possibility of collecting treated storm water within an on-site reservoir for a larger high-density, mixed-use project with approximately 2000 units. Assuming that there is adequate space (for the pond) and financial resources, has anyone successfully permitted a drinking water supply by way of an onsite pond? The client is interested exploring treatment options, including some of the green types that are currently available. Any input or ideas are greatly appreciated?

H.

 

[Muggle]

I son't see where the pond as potable water source needs to be permitted per se - other then the standard permitting that may be required locally for a pond of "X" size/gallonage. Where the water comes from for the potable water source is immaterial - it's the "post" treatment water for potable use that has to meet Federal, State, and possibly County codes.

That said, 2000 units would be an average of 300,000 gpd - figuring each unit has it's own dishwasher and washing machine. I would suggest something along the line of Honeywell 's "Exceed" system with probably 3-micron Amiad self cleaning filter on the incoming side of the filter system, and then either ozone or UV/ozone if going to a storage tank. Chlorine or chlorine dioxide will be federally required on the water to the units.
Dave/Aquatic Technologies

 

[bimr]

If you review Recommended Standards for Water Works, under source development, it says "The designing engineer must prove to the satisfaction of the reviewing authority that an adequate quantity of water will be available, and that the water which is to be delivered to the consumers will meet the current requirements of the reviewing authority with respect to microbiological, physical, chemical and radiological qualities."

Further, "A sourcewater protection plan enacted for continued protection of the watershed from potential sources of contamination shall be provided as determined by the reviewing authority".

It may be possible to do this, but one would have to question whether it is economical.

 

[oxilume]

Hoagie,

Before running down the road and using storm water runoff, you should wait until the LT2 treatment regulations are published in October or November.

The new cryptosporidium regulations in combination with an analysis of the pond water will determine which "bin" the Drinking Water Treatment Plant will fall into.

This will then guide the P.E. as to what type of plant will be required to meet the LT2 regs.

Using the EPA's guideline of 400 gallons/day per person with an average of 4 people per home, than 2000 units would require about a 1.6 mgd plant. You are talking about $2 to $5 million for a 2 mgd plant.

Muggle - the source water is extremely important in designing a WTP. It is the key that drives surface water or well water regulations. Likewise, finished water (potable or drinking water) is regulated based upon source water quality.





Todd

http://www.oxilume.com

 

[Hoagie]

Many thanks Todd, bimr, and Muggle for the insight and tips.