Agenda - Council Work Session - 10/20/2020 - Special

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3.1.1 3.1.2 3.1.3 Figure 2 - Pilot Study Train 2 Aeration Chlorine Detention Basin LPotassium Permanganate Filtration Forced Draft Aerator The SEH pilot water plant utilized a forced draft aerator, which consists of an aerator column, packing material, and a blower. During treatment of the water for Train 2, water was pumped from the well into the pilot water plant aerator, and then percolated down through the packing material in the aerator column as air was blown up through the packing material. Aeration of water is done to oxidize the iron into solids so that they can be filtered out. Aeration of water can also remove dissolved gases in water such as hydrogen sulfide. Detention Tank After aeration during Train 2, a detention lank in the pilot water plant was used to provide additional reaction time for chlorine to oxidize iron and potassium permanganate to oxidize manganese in the water. For this study, the system was set up to provide 30 minutes of detention before filtration. Chemical Feed System The chemicals used for the pilot study included chlorine, in the form of sodium hypochlorite, and potassium permanganate (KIV1n04). While chlorine is used for oxidizing iron, potassium permanganate is used for the oxidation of manganese. Both chemicals are commonly used in trealment systems for the removal of iron and manganese. The sodium hypochlorite solution was fed at a strength of 15 grams per liter (gp1). Potassium permanganate was fed at a strength of 4 gpl, The chemical feed systems used in the pilot study included Odos peristaltic metering pumps capable of feeding a maximum of 31 gallons per hour (gph). Chemical addition was measured using calibration columns for each chemical feed pump. The voiume (in milliliters) of each chemical pumped was measured per unit of time and the dosage was calculated based on the flow to the individual treatment trains. PILOT STUDY REPORT RAMSY 154354 Page 3