Evaluation of Contaminant Mixing in Rainwater Harvesting First Flush Diverters

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Title: Evaluation of Contaminant Mixing in Rainwater Harvesting First Flush Diverters
Author: Mechell, Justin K.
Abstract: As the world population increases , the demand increases for quality drinking water . The harvesting of rainwater has the potential to assist in alleviating pressures on current water supplies and storm water drainage systems . Diversion of a portion of the collected water away from storage is a technique used to improve harvested rainwater water quality prior to storage . Six configurations of a downspout first flush diverter were constructed and tested in the laboratory . The configurations of diverters were evaluated for their affinity to allow diverted water in the diverter chamber to interact with the flow of water to storage . Experiments were conducted at flow rates ranging from 0 .76 L /min to 113 .56 L /min . This range of flow rates adequately represents a wide range of common storm intensity patterns across the United States to which downspout first flush diverters are subjected . The diverter chamber to downspout transition fittings tested on a 10 .16 cm diameter diverter chamber , upward and downward oriented sanitary and straight tee , do not have a significant impact on the mean difference in initial and final total dissolved solids concentrations observed at multiple sample ports . No statistical difference was observed when comparing upward and downward oriented sanitary tees used as diverter chambers to downspout transition fittings on 10 .16 and 15 .24 cm diverter chambers . Utilizing a straight tee as a transition fitting with a floating ball , acting as a barrier between water collected in the diverter chamber of a downspout first flush diverter and the flow passing through the transition fitting , limited diverted water from interacting with the subsequent flow of harvested rainwater . There is not a significant difference between the use of a downspout first flush diverter with diverter chamber diameters of 10 .16 and 15 .24 cm utilizing upward and downward oriented sanitary tees as downspout to diverter chamber transition fittings . Tests at flow rates less than or equal to 12 .11 L /min exhibited limited changes in total dissolved solids concentrations in the downspout first flush diverters with 15 .24 cm diameter diverter chambers . Tests at flow rates less than or equal to 1 .51 L /min exhibited limited changes in total dissolved solids concentrations in the downspout first flush diverters with 10 .16 cm diameter diverter chambers . The diverter chamber drain flow rate and volume impacts the observed differences in initial and final TDS concentrations at all sample ports on the diverter chamber of a downspout first flush diverter regardless of flow rate . The diverter chamber drain flow rate impacts the flow rate of water entering the diverter chamber through the transition fitting .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -08 -7181
Date: 2010-01-14

Citation

Evaluation of Contaminant Mixing in Rainwater Harvesting First Flush Diverters. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -08 -7181 .

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