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carbon [2019/03/19 10:59] thierry |
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| Activated carbon is utilized in water filtration in two basic forms: Granular Activated Carbon (GAC) and carbon block. | Activated carbon is utilized in water filtration in two basic forms: Granular Activated Carbon (GAC) and carbon block. | ||
| - | ===== Why Carbon Block is a Better Choice than Granule Active Carbon ===== | + | ===== Why Carbon Block is a better than Granule Active Carbon ===== |
| Carbon block is mainly comprised of activated carbon granules and a binding agent that allows the carbon granules to maintain a static position relative to each other. Carbon block immobilizes carbon particles, stopping water from channeling, achieving a higher effectiveness in contaminant reduction. | Carbon block is mainly comprised of activated carbon granules and a binding agent that allows the carbon granules to maintain a static position relative to each other. Carbon block immobilizes carbon particles, stopping water from channeling, achieving a higher effectiveness in contaminant reduction. | ||
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| Carbon block water filters employ three processes to remove or reduce contaminants from drinking water. | Carbon block water filters employ three processes to remove or reduce contaminants from drinking water. | ||
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| - **mechanical filtration**. Carbon blocks can mechanically filter particles as small as one-half micron (submicron). | - **mechanical filtration**. Carbon blocks can mechanically filter particles as small as one-half micron (submicron). | ||
| - **electrokinetic adsorption.** This process works as water passes through one outer wrap, which causes the material in the wrap to acquire a positive molecular charge that attracts negative ions of certain pollutants. | - **electrokinetic adsorption.** This process works as water passes through one outer wrap, which causes the material in the wrap to acquire a positive molecular charge that attracts negative ions of certain pollutants. | ||
| - **physical adsorption**. The carbon itself attracts pollutants. Specially formulated binders used in compressed carbon blocks can avoid masking the surface of the carbon, thereby optimizing its ability to reduce levels of pollutants. | - **physical adsorption**. The carbon itself attracts pollutants. Specially formulated binders used in compressed carbon blocks can avoid masking the surface of the carbon, thereby optimizing its ability to reduce levels of pollutants. | ||
| - | ===== Compressed vs. Extruded ===== | + | Filters a usually rated by size of the particles it can remove. Typical ratings are from 50 micron (least effective) to 0.5 micron (most effective). We generally use 10 micron carbon blocks in our systems, because it gives us very effective absorption capabilities in combination with acceptable water flow rates. |
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| - | Carbon block is manufactured using one of two processes: extrusion or compression molding. | + | |
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| - | **Extruded carbon blocks** are manufactured using a mixture of carbon, binder and other media that is forced through a die to form a continuous block. The block is then trimmed to size. | + | |
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| - | **Compressed carbon blocks** are manufactured individually in a mold under great pressure and high heat. | + | |
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| - | Advantages of compression molding: | + | |
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| - | * more consistent filtration properties | + | |
| - | * more porous binder material can be used, resulting in superior performance and increased capacity when comparing same sized blocks | + | |
| ===== Raw Material Selection ===== | ===== Raw Material Selection ===== | ||
carbon.1552993176.txt.gz · Last modified: 2019/03/19 10:59 by thierry
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