Definition - What does Manganese Greensand mean?
Manganese greensand is greensand coated with manganese oxide, which is a unique medium used in conjunction with a filtration system to oxidize, precipitate and remove iron, manganese and hydrogen sulfide.
Manganese greensand, by design and operation, possesses great flexibility as an oxidizing filter media. It has established itself as the one of the most popular technologies for iron and manganese removal from municipal and industrial well waters, as well as other waters containing these substances.
Corrosionpedia explains Manganese Greensand
Manganese greensand is capable of reducing iron, manganese and hydrogen sulfide in water through oxidation and filtration. Manganese greensand is processed from glauconite, an iron, potassium, alumino-silicate material of marine origin. The glauconite is stabilized, then coated with manganese oxide in various valence states. Its manufacturing process uses the ion exchange properties of its stabilized glauconite (greensand) substrate to form an active manganese oxide coating. When the oxidizing capacity power of the manganese greensand bed is exhausted, the bed must be regenerated with a weak potassium permanganate solution.
Advantages of the manganese greensand process over aeration and filtration include:
- Single pumping (as the process generally employs pressure filtration)
- High-quality effluent
- Ease of operation
There are two different treatment processes associated with the use of manganese greensand, intermittent regeneration (IR) and continuous regeneration (CR), both of which have become industry standards. In addition, manganese greensand can, under certain conditions, remove manganese by catalytic oxidation.
Both the CR and IR processes are relatively uncomplicated in both their design and operation, and result in an efficient, reliable method for iron and manganese removal. Generally, the CR method is used where iron predominates with only small amounts of manganese, while the IR or catalytic oxidation process is used for water where manganese removal, with or without the presence of iron, is required.