By Wendy E. Condit , Abraham S.C. Chen
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Additional resources for Arsenic Removal from Drinking Water by Iron Removal U.S. EPA Demonstration Project at Sabin, MN Six-Month Evaluation Report
4% of the total amount of water treated. Table 4-5 summarizes the backwash settings established on January 30, 2006 during system startup and on July 21, 2006 to modify the minimum backwash time due to a HachTM turbidimeter malfunction. Backwash issues experienced during the first six months of system operation included backwash controls related to the frequency and duration of backwash, as well as backwash failure alarms. 1 Backwash Frequency Issues. On February 28, 2006, the vendor implemented a PLC programming change that added a decimal place to the hour meter readings to improve accuracy of daily filter run time and average system flowrate records.
Filtered water was sent to a 57,000-gal underground clearwell and then pumped to the water tower via two 20-hp high service pumps, which were operated on an alternating basis. 19 Kinetico FM-248-AS Arsenic Removal System Flow Turbidity Backwash Waste to Sewer by Others Feed Water at 50-100 psi Contact Vessels Filter #2 48" x 72" Chemical Metering Pump Filter #1 Flow 48" x 72" 63" x 86" 63" x 86" P P P Filtered Water to Storage/Distribution by Others N aOCl Existing Figure 4-4. Schematic of Kinetico’s FM-248-AS Arsenic Removal System Figure 4-5.
The presence of ammonia and other reducing species, such as As(III), Fe(II), and Mn(II) in raw water significantly increased the chlorine demand. 6% (as Cl2). 4 mg/L. Although speciation results showed that the levels of prechlorination were adequate for As(III) and Fe(II) oxidation, the variation in chlorine levels may have affected the rate of Mn(II) oxidation. The variation in chlorine levels could be caused by the control of the chemical feed pump and/or a declining NaOCl solution strength over time, which was refilled by the chemical supplier on a monthly to bi-monthly basis.
Arsenic Removal from Drinking Water by Iron Removal U.S. EPA Demonstration Project at Sabin, MN Six-Month Evaluation Report by Wendy E. Condit , Abraham S.C. Chen