Iron & Manganese Removal From Hungerford & Terry

Prior to World War II, researchers in the water treatment field working with well-known chemical theories of oxidation and reduction, developed the basic technology of manufacturing manganese greensand from the mineral glauconite.

H&T perfected the manganese greensand process with the development of the Ferrosand CR (continuous regeneration) Process, which was patented in 1963.

In 2005, GreensandPlus, the next generation of manganese greensand was developed and has been marketed to the water industry.

Today, GreensandPlus is utilized as an exact replacement for manganese greensand for CR or IR (intermittant regeneration) application. It requires no changes in backwash or chemical feed rates. GreensandPlus ensures the complete oxidation of soluble iron, and manganese using stoichiomatric quantities of oxidizing agents without the need for long reaction times, dissolved oxygen, or elevated pH levels.

GreensandPlus advanced chemical properties allows it to be used in various methods of operation. This allows flexibility in the design of the water treating equipment with specific tailoring to the raw water characteristics.

Filtration
Important for A Wide Range of Water Sources
Drinking water from a wide range of sources can be made sparkling clear and free of turbidity, color, taste, odor, and suspended matter by a well-engineered, low-cost system employing the appropriate Hungerford & Terry filter technology.

Ferrosand Filtration
Effectively and economically treating iron and manganese in well water
Well waters containing iron, manganese, and hydrogen sulfide can be economically and effectively treated with our own Ferrosand filter technology. Ferrosand registered trade name for our filtration system. The GreensandPlus medium employs chemical oxidation and reduction in coordination with the catalytic properties to achieve the desired filtration.

GreensandPlus's unique properties permit it to be used in several distinct ways. This gives Ferrosand filtration systems an extraordinarily high degree of flexibility that makes our use of them highly responsive to the demands of the particular application and the specific features of the raw water to be treated.

GreensandPlus Catalytic Oxidation
The iron and manganese removal process
Since 1990, we have been achieving outstanding results by designing systems using the catalytic action of Ferrosand's manganese oxide coating in the presence of chlorine. Manganese oxides are maintained in a regenerated condition by the oxidizing environment provided by the chlorine. No potassium permanganate is needed with a catalytic iron and manganese removal process.

The flux rate for a catalytic system is usually much higher than that available in more traditional systems. The higher flux rate is derived from the nature of the process itself, from the catalytic nature of GreensandPlus, and from attributes of the system design. The process yields unusually long operational runs from 2 to 4 days. An optional air/water wash prior to backwashing maintains the GreensandPlus in a loose, clean state with little to no compaction. Because backwash volumes are very small -- usually 0.25% to 0.50% of system capacity -- no recovery is normally required. However, a recovery system to reclaim approximately 85% of the backwash waste can be provided.

The The Ferrosand System can be delivered as a completely assembled and packaged unit. It is fully automatic and uses the most advanced PLC controls with a panel mounted touchscreen operator interface terminal.