Green Sand Filters & applications

In large flows such as with industrial water filtration, it is typically accomplished with chlorine and / or potassium permanganate, a strong oxidizer. Because the oxidation reaction required to convert the soluble material into solid particles, followed by successful filtration must be accomplished in 1-2 minutes of filter residence time, the water chemistry must be conducive to rapid reaction kinetics. Technical literature typically recommends pH in the 6.2 to 6.5 range. Our experience with waters in the SE US demonstrates pH 6.8 to be optimal. Alkalinity must be ≥ 120 ppm. These parameters can be adjusted by metering a dilute caustic and / or a soda ash solution into the water upstream of the filter to adjust pH and alkalinity, respectively. For iron alone, chlorine fed at a concentration of 1.0 to 1.2 times the iron should be adequate to oxidize the iron and “regenerate” the manganese greensand. Since excess chlorine is not deleterious to green sand filtration, it is possible to feed enough to provide adequate free chlorine residual in the filtered water sufficient for introducing into the clear well and pumping to service.

Catalytic Oxidation (CO):  At the same time in the water industry, we also refer to this as continuous operation. Before the Greensand filter, the catalytic oxidation operation involves feeding a strong oxidant directly into the raw water before feeding it to the raw water. It is Chlorine (Cl2) that uses the most common oxidant.

Intermittent Regeneration (IR):In this manner, the greensand catalytic function occurs on the surface of the Green sand media. Once the greensand media has reached capacity it’s going to not be capable of take away dissolved iron. It’ll have turn out to be exhausted and require regeneration. This regeneration method is similar to that of a water softener. The largest distinction is the regenerate chemical this is used. The most common chemical used to regenerate Green sand media is potassium permanganate.

The Green Sand Plus is used to remove and filter manganese, soluble iron, hydrogen sulfide, radium from water. It is also used to remove and filter manganese, soluble iron, hydrogen sulfide, arsenic, and radium from water products. When the Greensand Plus media is coated with manganese dioxide, this coating provides the catalyst in the oxidation reaction of iron and manganese. This coating provides the catalyst in the oxidation reaction of iron and manganese.

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