water consulting - industrial wastewater treatment

Iron and Manganese Removal
Quantum DMI-65 Media

arsenic removalDMI-65, silica sand based filtration media, is designed for the removal of Iron and Manganese without the use of potassium permanganate. The unique microporous structure of DMI-65 efficiently removes dissolved iron to as low as 0.005 PPM and manganese to 0.001 PPM. After initial activation, the DMI-65 acts as an oxidation catalyst with immediate oxidation and filtration of the insoluble precipitates.

The media has been used extensively in a wide variety of applications. It has been used in many countries for drinking water applications for over 20 years. DMI-65 is also being used in the United States for iron removal in steel mill cooling water to prevent plugging of spray nozzles, and in boiler feed water systems to protect RO membranes. DMI-65 is manufactured in Australia and for availability, contact K2O Consulting.

Technical Specifications
Physical Properties Operating Conditions
Color Brown to Black pH Range 5.8 - 8.6
Bulk Density 91.0 lbs. / ft 3 Maximum Water Temp. 113 F (45 C)
Specific Gravity 2.69 Minimum Bed Depth 24 Inches (600 mm)
Effective Size 0.48 mm Freeboard 40% Minimum
Uniformity Coefficient 1.3 Service Flow Rate 2-12 GPM / ft2
Mesh Size 20-50 Backwash Flow Rate 10-20 GPM / ft2
Annual Attrition 1-5% Backwash Expansion 15-50%
Advantages of DMI-65 Media
  • Eliminates the need for potassium permanganate - Operates with continuous injection of sodium hypochlorite at low residual levels (0.1-0.3 PPM).
  • Certification - DMI-65 is NSF and ANSI 61 Certified so it can be used for drinking water applications.
  • Wide pH Range - Stable and satisfactory performance at pH 5.8 8.6
  • High Flow Rates - DMI-65 can operate at linear filtration velocities up to twice that of conventional media with a corresponding reduction in capital equipment costs.
  • Higher Operating Temperature - Maximum operating temperature of 113 F (45 C).
  • Long Life - DMI-65 is not consumed in the process, providing considerable advantages over other processes or media.
  • Regeneration not Required - After initial activation, only sodium hypochlorite feed is required.
  • System Compatibility - Physical properties are similar to that of competitive media allowing conversion to DMI-65 without major hardware modifications.

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