Centerville WSC has two wells: in house well has 120 gpm capacity and remote well has 165 gpm capacity. At any given time only one well runs so the aerator is designed for 200 gpm of flow. For Centerville WSC, WETS supplied a forced draft fiberglass aerator on a GST. The 200 GPM municipal water treatment aerator was utilized to remove THM from the contaminated water. Aeration was considered as the ideal water treatment solution for this project.
The formation of Trihalomethanes (THMs) in water is caused by the presence of organic matter and chorine. The amount of THMs in water depends on several factors such as the amount and type of organic matter, composition and structure of the organic matter, temperature, pH, chlorine dosage, contact time between chlorine and the organic matter, and bromide concentration. THMs have been suspected as carcinogenic and must therefore be reduced from drinking water. The four THMs are chloroform, bromodichloromethane, dibromochloromethane and bromoform. Clean drinking water must comply with the maximum contaminant limit of 80 ppb set by the state regulatory agency TCEQ.
Through the pilot study, WETS determined that the most ideal way to reduce the THM levels at Centerville would be through the implementation of an aeration system. The process engineers at WETS designed an aerator with a 3 ft diameter and 10 ft height. Because the aerator was designed for only 200 gpm of flow, well pumps would alternate in operation. An air loading rate of 1030 cfm was selected to ensure THMs were adequately removed. Exhaust vents on the aerator are used as a medium through which the THMs can safely be discharged into the atmosphere. BETE nozzles on the aerator disperse water onto the LANPAC XL Polypropylene packing to allow for enhanced mass transfer when the water comes into contact with air. The aerator was installed on the largest GST and currently supplies water to all three GSTs.
Client : Centerville WS – Groveton, TX
Year : 2021
Category : Aerator