Pureflow systems for radium and uranium removal combine pretreatment chemical feed and NSF approved filter media with an automated process to provide an operator friendly filtration system requiring minimal attendance by maintenance personnel. Both disposable resin and coagulation/ filtration media processes are available.
The removal of radium and uranium from potable water supplies can be achieved by coagulation / filtration processes as follows: radium is removed by sorption onto preformed hydrous manganese oxides (HMOs) and the removal of the HMO/ radium by adsorption onto a filter media. Uranium is removed by sorption onto a ferric hydroxide floc, and by its adsorption onto a filter media. The Pureflow multi-media filter includes a highly active catalytic adsorptive media that adsorbs heavy metals, including iron, manganese, cadmium, zinc, etc., in essentially hydroxide forms. The filter media is cleaned by backwashing the filter with processed water. The backwash to filtration ratio is less than 2%.
Well water containing radium / uranium is chemically treated first with chlorine to oxidize any iron in the raw water. Ferric salt (if required) is then fed to remove the uranium by sorption onto the ferric hydroxide floc; an HMO is then fed to remove the radium by sorption onto the hydrous manganese oxide. Excess chlorine is fed to provide a free chlorine residual to the treated water distribution system.
Disposable resin media systems are provided when raw water quality allows sufficient media bed volumes to justify media replacement costs.
- ASME code pressure vessels up to 250 psi
- Chemical pretreatment equipment
- Multi-media filter load (NSF 61 Approved)
- Filter face piping
- Electrically operated butterfly valves
- Flow control valves
- Backwash flow control valves
- Filter and backwash flow meters
- Permanent and disposable media
- Stainless steel wedge-wire wrapped laterals
- Automatic control panel (PLC Based)
- NSF approved interior coating
- Chemical feed equipment
- Air relief valves