Arsenic Removal
Inorganic arsenic (arseniite and arsenate) can be removed by MetalEase-ALF. The process is very pH
sensitive and capacity decreases rapidly when the pH is below 5.5 or above 6.0. Arsenite is not
removed nearly as well as arsenate; therefore, prechlorination to convert arsenite to arsenate
may be required. Arsenic removal is also affected by temperature and by the TDS of the feedwater.
Increasing temperature increases capacity while increasing TDS decreases capacity.
Equilibrium capacity for arsenate (1,000 ppm TDS, 25°C, 1 mg/L As) is approximately 0.66 lbs/cu.ft.
Operating capacity to a 10% leakage end point is approximately 10% of the equilibrium capacity. Regeneration
can be accomplished by using 3 to 4 lbs/cu.ft. of 2 to 4% sodium hydroxide, over 20 to 30 minutes, followed
by nuetralization with acid to a pH of 5 to 6.
Lead Removal
Dissolved lead is adsorbed by MetalEase-ALF and is not normally regenerable. Capacity for lead is at
least 0.4 lbs/cu.ft. while maintaining greater than 98% lead removal. This process is not dramatically
affected by flow rate, temperature, or TDS. However, pH should be maintained above 6.0 as lead removal
drops under acidic conditions, and below 10 as lead precipitates under basic conditions.
Fluoride Removal
Fluoride is removed by MetalEase-ALF by a chemical reaction with the media. The process is flow and pH
sensitive. The best results are obtained when the flow is limited to about 1 gpm/cu.ft. and the pH is held
at 5.5. Higher flows and higher or lower pH causes a significant loss of capacity. The best capacity
obtainable is approximately 0.2 lbs/cu.ft. Leakage of fluoride is generally less than 0.1 mg/L to breakthrough.
Regeneration can be accomplished using 3 to 4 lbs/cu.ft. of 2 to 4% sodium hydroxide over 20 to 30 minutes,
followed by neutralization with acid to a pH of 5 to 6.
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Warning
For safety and handling purposes, avoid contact with eyes, skin, and clothing. Avoid
breathing the dust and always use adequate ventilation. Wash thoroughly after handling.
Keep away from heat and easily oxidizable materials. |
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Features & Benefits: |
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Does not release arsenic, lead, or fluoride except during regeneration
and can be sent to landfill when used in single pass applications (ie. cartridges, exchange
tanks, rebedding, etc.) |
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Removes metals through a combination of adsorption and chemical reaction
with the media, thus the removal is not dependent on ion exchange |
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Uniform particle size with minimal shrinkage or swelling and low pressure loss |
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Physically stable and can be used over a wide pH range |
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Certified to NSF/ANSI Standard 61 for drinking water applications |
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| TYPICAL PROPERTIES |
| Part Number |
METALEASE ALF |
| Chemical Structure |
Crystalline Aluminum Oxide |
| Physical Form |
Tough Uniform Granules |
| Surface Area |
315 m²/gr |
| Mesh Size |
12 x 40 |
| pH Range |
4 to 10 |
| Water Retention |
Less than 5% |
| Solubility |
Nil |
| Shipping Weight |
50 lbs/cu.ft. |
| Packaging |
1 cu.ft. box |
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| SUGGESTED OPERATING CONDITIONS |
| Max. Temperature |
100°C (212°F) |
| Max. Free Chlorine |
1 ppm |
| Min. Bed Depth |
36 inch minimum
(5 to 7 foot preferred) |
| Backwash Rate |
To achieve 10 to 25% expansion |
| Service Flow Rate |
1 to 2 gpm/cu.ft. |
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View SWT Filtration Media Guide |
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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.
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CAUTION
Do not mix ion exchange resin with strong oxidizing agents. Nitric acid and other strong oxidizing
agents can cause explosive reactions when mixed with organic materials, such as ion exchange resins. |
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| MetalEase-ALF™ is a trademark of Safe Water Technologies, Inc. |
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