Filtration Media
SWT logo MTM® Filtration Media
MANGANESE GREENSAND EQUIVALENT

MTM® is a granular manganese dioxide filtering media used for reducing iron, manganese, and hydrogen sulfide from water. Its active surface coating oxidizes and precipitates soluble iron and manganese. Hydrogen sulfide is oxidized to a sulfur. The precipitates are filtered out in the granular bed and removed by backwashing.

MTM consists of a light weight granular core with a coating of manganese dioxide. The coating provides an example of contact filtration where the media itself provides the oxidizing potential. This allows for a much broader range of operation than many other iron removal medias. A pH level as low as 6.2 can be treated. Dissolved oxygen is not essential. The media’s light weight reduces backwash water requirements.
 
Physical Properties
Color   Dark brown
Bulk Density   45 to 50 lbs./cu.ft.
Specific Gravity   2.0 gm/cc
Effective Size   0.43 mm
Uniformity Coefficient   2.0
Mesh Size   12 x 50
 
Conditions for Operating
Water pH Range   6.2 to 8.5
Maximum Water Temp.   100°F (38°C)
Bed Depth   24 to 36 inches
Freeboard   50% of bed depth (min.)
Service Flow Rate   Continuous 2 to 5 gpm/sq.ft.
(Intremittent flows up to
10 gpm/sq.ft.)
Backwash FLow Rate
@ 60°F		   8 to 10 gpm/sq.ft. for tanks 12 inch dia. or less,
10 to 12 gpm/sq.ft. for tanks 13 inch dia. or more
Backwash Expansion Rate   20 to 40% of bed depth (min.)
     
Maximum Practical Limit
Iron   15 ppm
Manganese   5 ppm
Hydrogen Sulfide   2 ppm
     
Influent and Backwash Limitations
Oil   None present
Polyphosphates   None present
Air Scour   Not allowed
     
Continuous Regeneration
Use Cl2, KMnO4 or both
     
Intermittent Regenerations
KMnO4 Dosage   1.5 to 2.0 oz (by dry wt.) per cu.ft.
Regeneration Time   greater than 30 minutes
Rinse   until all traces of KMnO4 are gone
     
Packaging
1 cu.ft. bags — 40 bags / pallet
 

Features:

  • Broad operating range for iron reduction
  • Lower pressure loss through the bed with high flock holding capacity
  • Effective hydrogen sulfide, iron, and manganese reduction
  • Light weight requires lower backwash rates and reduces pumping requirements
  • Chlorine can be beneficial in extending filter run times
  • Low attrition loss for long bed life
  • Lower shipping cost
 
 
 
 
 
 

When the oxidizing power of MTM is reduced, the bed has to be regenerated with a weak solution of potassium permanganate (KMnO4), thus restoring its oxidizing capacity. A regenerating solution of 1½ to 2 ounces (dry weight) of potassium permanganate per cubic foot is sufficient for normal regeneration. Upon start-up a new bed should be backwashed and caution taken to insure that the lightweight media is not backwashed to drain. A new bed should be regenerated the evening of installation. Operating the filter after its oxidizing capacity is exhausted will reduce its service life and may cause staining.

MTM requires either intermittent or continuous regeneration to maintain its oxidizing capacity. A solution of potassium permanganate (or chlorine then potassium permanganate) can be pre-fed to maintain capacity. In the latter case, the manganese dioxide coating acts as a catalyst to enhance the oxidation reaction and as a buffer to reduce any excess potassium permanganate concentration and prevent it from entering the service lines.

The addition of other chemicals to influent or backwash water which contacts MTM media may inhibit iron, manganese, or hydrogen sulfide removal, or may break down or coat MTM media. Before adding any chemical to the influent or backwash water, other than chlorine or potassium permanganate, the chemical's compatibility with MTM should be thoroughly tested.
 
NOTE: Based upon actual field installations we noticed that like Manganese Greensand, MTM can be stripped of its active surface coating if not regenerated properly. MTM will turn a whitish color over time while Manganese Greensand is difficult to determine by eye whether it is stripped or not. We prefer MTM media, being considered a newer media, not be put in manual regenerating installations because the human variable of not regenerating timely and thus giving the media a poor evaluation.
    
Certified to
NSF/ANSI
Standard 61
 
 
This information has been gathered from standard materials and or test data that is believed to be accurate and reliable. Nothing herein shall be determined to be a warranty or representation expressed or implied with respect to the use of such information or the use of the goods described for any particular purpose alone or in combination with other goods or processes, or that their use does not conflict with existing patent rights. No license is granted to practice any patented invention. It is solely for your consideration, investigation and verification.

MTM is a registered trademark of Clack Corporation.
 
 
Previous Page
Home | Products

Ultraviolet Systems | Drinking Water Systems | Reverse Osmosis Systems
Residential Systems | Commercial & Industrial Systems | POE Components
Filtration Media | Ion Exchange Resins | Filter Housings & Cartridges
Air Injectors | Chemical & Static Mixers | Chemical Feed Pumps | Reagents | Test Kits
Misc. Products | Product Manuals
 
Safe Water Technologies, Inc.
996 Bluff City Boulevard
Elgin, IL 60120 USA
  
 
Telephone: +1.847.888.6900
Facsimile: +1.847.888.6924
E-mail: info@swtwater.com
http://www.swtwater.com

Last Updated: March 5, 2008