Coagulation filtration is a process that introduces a coagulant, typically an iron or aluminum salt, to pretreat water contaminated with arsenic, iron, manganese, and/or sulfides. The process allows for significantly higher flow rates per square foot of media, creates less backwash water than other conventional treatment approaches, and has a smaller footprint which allows for lower operating and capital costs. This process involves a chemical addition, automated processes which decrease operator involvement and expense, and does not generate a hazardous waste.
AdEdge uses ADGS+ black filter media for removing soluble iron, manganese, hydrogen sulfide, arsenic and radium from water supplies in the coagulation/filtration process. The manganese dioxide coating the surface of GS+ acts as a catalyst in the oxidation-reduction reaction of iron and manganese. The silica sand core of GS+ allows it to withstand operating conditions in waters that are low in silica, TDS and hardness. When using GS+, you can eliminate the aluminate feed. GS+ is effective at higher operating temperatures and higher differential pressures than ordinary manganese greensand. Tolerance to higher differential pressure can provide for longer run times between backwashes and a greater margin of safety.
GS+ is a proven technology for iron, manganese, arsenic, radium and hydrogen sulfide removal. Unlike in situ treated media feeds, there is no need for extensive preconditioning of filter media or lengthy startup periods, during which required water quality may not be met.
Coagulation/Filtration Treatment System Benefits
- Use of a coagulant (i.e., ferric chloride) to aid in arsenic removal
- Arsenic (III) is oxidized to Arsenic (V)
- Low operating costs
- Effective for arsenic concentrations greater than 50 ppb
- More reliable and efficient removal of iron, manganese and sulfide than conventional approaches using different medias
- Superior handling properties, stability and NSF 61 certification
- Long life cycle, with typically over 10 years before replacement
- Performance over wide range of incoming water quality
- Backwash water can be recycled using an H2Zero Backwash/Recycle system