The city of Warm Springs is a small community of approximately 500 residents located in central Georgia. In 2010, water testing found a radium level between 8 to 11 pCi/L and a gross alpha level of 25 pCi/L, both above state and U.S. EPA drinking water regulations of 5 pCi/L and 15 pCi/L, respectively.
Later that same year, Engineering Management Inc. conducted a pilot test of a manganese-dioxide-coated media for the removal of both radium and gross alpha particulate material from the water. After successful piloting of the treatment approach and through an award process, EMI contracted AdEdge Water Technologies to design, manufacture and commission a radium and gross alpha removal system for the city of Warm Springs.
The resulting treatment solution consisted of a co-precipitation process within a WaterPOD containerized system rated for 250 gpm. The model, APU26-4860CS-6-AVH, utilizes AdEdge ADGS+ media in a six-vessel carbon steel configuration in parallel. The radium and gross alpha removal system is pre-packaged and housed within a 40-foot modularized structure equipped with HVAC, pedestrian doors, ventilation windows and lighting.
Sitting on a concrete foundation, the WaterPOD was selected for its cost and schedule advantages over traditional building approaches. The vessels are loaded with ADGS+ filtration media for the removal of radium and gross alpha, which is NSF 61 certified for use in potable water. The raw water from the well is injected with sodium hypochlorite and a manganese salt prior to being treated in the vessels for optimal radium co-precipitation and removal. Chemical feed dosing is pulse-controlled by the treatment system’s programmable logic controller (PLC). The feed rate is adjusted based on system flow rates, while the PLC performs all automated functions needed for proper operation of the control valves. Backwashing of the treatment vessels occurs two or three times a week depending on the incoming radium and gross alpha levels, as well as the volume of treated water to remove any particulates and prevent hydraulic channeling. Backwash water is disposed of in a sanitary sewer.
This project was the first installation of this type in the state of Georgia. The system was started up and put into operation in October 2014.
Case Study Fast Facts
Client: Engineering Management Inc.
Location: Warm Springs, GA
Date: October 2014
Contaminants treated: Radium/Gross Alpha
Flow rate: 250 gpm