spartanwatertreatment.com Blog » rain water http://spartanwatertreatment.com/blog Ozone and Advanced Oxidation Systems Fri, 10 Feb 2012 15:34:22 +0000 en hourly 1 http://wordpress.org/?v=3.1.4 Ozone and UV Good Choices for Treating Water From Green Roofs http://spartanwatertreatment.com/blog/2010/07/29/ozone-and-uv-good-choices-for-treating-water-from-green-roofs/ http://spartanwatertreatment.com/blog/2010/07/29/ozone-and-uv-good-choices-for-treating-water-from-green-roofs/#comments Thu, 29 Jul 2010 16:15:10 +0000 Administrator http://spartanwatertreatment.com/blog/?p=338 Continue reading →]]> A recent report from the Texas Water Development Board entitled: Effect of Roof Material on Water Quality for Rainwater Harvesting Systems was recently published. As the title mentions, the study centered on the effect that different roof material have on the quality of collected rainwater. A survey of the most common roofing materials in Texas was completed, and found that the three most common were asphalt-fiberglass shingles, Galvalume® metal panels, and concrete tiles. In this post we will look at two specific issues in the study, dissolved organic carbon (DOC) and coliform contamination. The study looked at the impact of the first flush through third flush of water off the surface. As expected, the first flush contains the most contaminants.

Runoff from the green roof was lowest in both Total Coliform and Fecal Coliform compared to the other treatments, but both were present in all treatments after the first flush. Coliform can be eliminated with a UV or ozone disinfection system, but a green roof goes a long way towards eliminating it before filtration.

DOC tests measure the amount of organic material in a solution. Organic materials from plants and animals can break down to such small sizes that they can become dissolved in water. Because DOC is derived from living organisms, it makes sense that the water collected from the green roof had the highest levels of DOC’s.

The big implication here is on the use of chlorine to disinfect collected rain water. Chlorine reacts with DOC to form all sorts of undesirable byproducts such as trihalomethanes and haloacetic acids. To avoid this problem all together, collected rainwater from a green roof should be treated with a disinfectant other than chlorine before use. UV light and ozone are proven alternatives to chlorine.

]]> http://spartanwatertreatment.com/blog/2010/07/29/ozone-and-uv-good-choices-for-treating-water-from-green-roofs/feed/ 0 Federal Building in NYC to Harvest Rainwater with Ozone/UV Treatment http://spartanwatertreatment.com/blog/2010/01/07/federal-building-in-nyc-to-harvest-rainwater-with-ozoneuv-treatment/ http://spartanwatertreatment.com/blog/2010/01/07/federal-building-in-nyc-to-harvest-rainwater-with-ozoneuv-treatment/#comments Thu, 07 Jan 2010 16:47:36 +0000 Administrator http://spartanwatertreatment.com/blog/?p=210 Continue reading →]]> The Thursgood Marshall Federal Building in NYC will have a rain water harvesting system which will employ filtration, ozonation and UV to insure the water is safe for use in the building. While many rain water systems employ UV, the engineers for this building decided to add the extra protection of ozone.

Ozone water treatment leaves a residual of ozone in the water. By recycling the water in the tank through the ozone system, ozone disinfect both the water in the tank as well as prevents the formation of bio films on the tank walls. UV only treats the water that passes through the UV reactor. It can not prevent contamination of the storage tank or prevent secondary contamination down stream of the reactor. Combining the UV and ozone technologies provides seamless protection for the water system.

Spartan Environmental Technologies was chosen as the supplier of the ozone water treatment system. Spartan will be providing one of it’s SPARTOX ozonation systems for the application.

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