Pilot Test Dennis, MA
Clayton, NJ – GreensandPlus, a high-performance water filtration media distributed by Inversand Company, has significantly outperformed the other proprietary media in pilot testing as well as increased the efficiency and lowered the operational costs of removing iron and manganese from the water supply for Dennis, MA.
During April and May of 2007, Earth Tech Inc.– Concord, MA conducted a pilot study examining the effectiveness of potential treatment options for iron and manganese removal at several of the Dennis Water District’s groundwater supplies.
Two separate treatment technologies were evaluated on each well during the study; a multimedia pressure filter with Inversand’s GreensandPlus media (GreensandPlus system) and a pressure filter with Layne Christensen’s LayneOx media (LayneOx system). The primary piloting objective was to demonstrate stable system performance while meeting drinking water treatment objectives for select parameters including iron and manganese. Here is a summary of the operational and analytical results obtained from the pilot study.Once optimized, both pilot systems were able to produce their respective water quality treatment objectives by consistently producing finished water with levels less than the SMCLs of 0.3 mg/L of iron (Fe) and 0.05 mg/L of manganese (Mn). However, the GreensandPlus system was able to consistently produced water with better quality over that produced by the LayneOx system.During the extended filter runs the GreensandPlus system produced approximately 15% more water than the LayneOx system during the extended run at Well No. 20 and the GreensandPlus system produced approximately 34% more water than the LayneOx system during the exteneded run at Well No. 8. Using the pilot data to estimate filter run times of 96 hours for the GreensandPlus system and 48 hoursfor the LayneOx system, we calculated the process efficiencies. The GreensandPlus system is 0.37% more efficient than the LayneOx system. This translates to a savings of 10.8 million gallons per year inbackwash supply water (assumes operation at 4 mgd non-stop for two facilities)
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