Design Guide for Community Water Systems - The Water, Sanitation ...

a. Give thorough mixing of compressed air with water being treated;b. Provide screened and filtered air, free of obnoxious fumes, dust, dirt,and other contaminants;c. Have the necessary delivery capacity of air at 5 psi to 10 psi pressure,depending upon depth of water in the basin;d. Give a detention period of 5 to 15 minutes based on design flow; ande. Provide from 0.005 cubic foot to 0.2 cubic foot per gallon of wateraerated.4.6.3. Spraying.a. Distribute water through spray nozzles with a pressure ofapproximately ten psi at the throat;b. The area covered by the spray from each nozzle from about 10 to 200square feet;c. The output per nozzle from 40 to 175 gallons per minute, dependingupon the type of nozzle; andd. Protection from loss of spray water by wind carriage by enclosure withlouvers sloped to the inside at an angle of approximately 45 degrees.4.6.3 Other methods of aeration.Other methods of aeration may be used if applicable to the treatment needs,subject to the approval of the department.4.6.4 Protection of aerators.All aerators except those discharging to lime softening or clarification plantsshall be protected from contamination from birds, insects, and windbornedebris.4.6.5 Disinfection.Groundwater supplies exposed to the atmosphere by aeration must receivechlorination as the minimum additional treatment.4.6.6 Bypass.A bypass shall be provided for all aeration units.4.6.7 Corrosion control.The aggressiveness of the water after aeration should be determined andcorrected by additional treatment, if necessary.Aug. 29, 2003Page 77