Potable rainwater system for Gulf State Park
Commercial scale rainwater system for a new Gulf State Park / USA / 2014
Trinkwasser von Regenwasser
Ecovie is proud to announce that it has contracted with Bernhard MCCfor all equipment for a commercial scale potable rainwater system to supply water for the new Gulf State Park Interpretive Center in Gulf Shores, Alabama. It will be one of the first commercial scale potable rainwater systems in the US. Ecovie worked with Integral Group from conception through engineering design. Ecovie is working with Aqua Treatment Services (ATS) for the main water treatment. The system will haveINTEWA PURAIN pre-filtration and a Xerxes 11,000 gallon fiberglass cistern as the facility’s sole water supply. There will be no well or municipal back up supply.
The project will be Living Building Challenge (LBC) certified with the rainwater system fulfilling the “water petal” qualification of achieving true net zero for water with no outside water being used and with no stormwater runoff. Collected water will be used for all building needs including drinking water and non-potable uses.
This is not the first commercial scale potable rainwater system in the US. We know of only one in full operation and that is one at the Chesapeake Bay Foundation’s BrockEnvironmental Centerin Virginia. It has been in operation since 2014 and has had great results. The Gulf State Park System will use the same 3rd party EPA UVDGM validated treatment system from our development partner, ATS. A second system was recently installed in Virginia at the Chesapeake Public Safety Building and awaits commissioning. Ecovie has several other commercial potable rainwater systems in various stages of development. In addition to these commercial scale potable rainwater systems, there are hundreds of single family residential; scale systems in operation, many of which Ecovie has designed and installed.
Many of you may wonder how it is possible to use captured rainwater from a rooftop as a potable water source. I will get to that in a minute, but first it is important to emphasize that roof captured rainwater is a primo water source typically with a lot less contaminants that what is found in other typical water sources such as surface water and groundwater. By just keeping rainwater from hitting the ground keeps it away from contaminants that come from things like farm and industrial runoff, animal activity, and even discharge from our own water treatment plants. This means that treatment of roof captured rainwater need not be overly complicated or complex since it does not contain the pathogens, pesticides, heavy metals, hydrocarbons, drugs, and other toxins found in other source waters.
Like all Ecovie rainwater systems, the design starts with the basic fundamentals of rainwater collection and storage, following ARCSA/ASPE 63 guidelines. Our PURAIN jump filter efficiently pre-filters rain from the 6,300 square foot rooftop as it enters the cistern (NSF 61 certified).
From the tank, water is pumped on demand through treatment which is quite similar to residential scale potable systems with sediment and carbon filtration with UV. What differs is that for commercial scale we use a treatment which is fully 3rd party validated drinking water test proving actual bacteria, virus, and protozoa (cryptosporidium) elimination with at least a 4 log removal of pathogens (99.99% removal). The test results in fact showed over 7 log reduction (99.99999%), far exceeding the requirement. This is done using ATS multi-barrier treatment. For more information on this treatment and test results click here. The ATS SKMB treatment is the only total disinfection treatment system tested with live organisms for MS2, Cryptosporidium, Bacillus Globigii, and Adenovirus with the EPA as well as having UVDGM 3rd party validation. This validation was done on each individual component and with the system as a whole. And perhaps more importantly, it is the only system already used successfully on a commercial scale potable rainwater system yielding clean, safe, great tasting water.
In order for the State of Alabama to permit the system, chlorine injection is required in addition our validated system to provide a low level residual disinfection downstream. While we are not crazy about putting a known carcinogen in our beautiful water, we completely understand the reasoning for adding a final level of protection for this first system in Alabama. Chlorine has been a standard water treatment method for over a century and most local standards still require this 19th century technology.
The system will have an upload of equipment and water quality data to a building management system (BMS). This will help with reporting requirements to the State. Parameters such as free chlorine, pH, and turbidity will be monitored continuously as well as equipment status with the filtration, UV, and pumping system.