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GreensandPlus - Iron & Manganese Removal Systems
H&T developed and patented the continuous regeneration process for iron and manganese removal in 1963. This process used a feed of chlorine and potassium permanganate upstream of a manganese greensand filter to keep the catalytic manganese dioxide coating of the manganese greensand media regenerated. Our method became the industry standard for the next 40 years. In 2005, H&T introduced GreensandPlus, the next generation in manganese dioxide–coated catalytic filter media. GreensandPlus has all the same physical properties of manganese greensand, so it can be used interchangeably, but GreensandPlus has many operational advantages over the old media.
First and foremost, it does not need potassium permanganate for regeneration. It can be regenerated using only chlorine or any strong oxidant. It is also much more durable, withstanding differential pressure up to, and above 20 psi. (Manganese greensand crushes into fines at differentials higher than 12 psi.). It has higher capacity, resulting in less frequent backwashes and a lower percentage of waste, and can operate at higher flux rates than the older product. H&T has many water-treatment installations operating at 8 gpm/ft2 and some as high as 12 gpm/ft2. If necessary, we can incorporate an air/water wash system that simultaneously uses air and water to backwash the media when treating water with elevated levels of manganese.One of our many underdrain designs uses a 5-inch square stainless steel expansive port distributor. The slot opening is controlled by a movable spline that prevents plugging and offers many advantages over a strainer with a fixed-slot opening, which is irreversible once it becomes plugged. The H&T iron and manganese filter system has been refined and modernized over the 50 years we have designed and built this type of equipment. It remains the most reliable system that can meet the most demanding requirements and widest variety of applications on the market today.
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.
