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carbon [2019/03/19 10:52] thierry created |
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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 the Better Choice ===== | + | ===== 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. | ||
| - | 1. **mechanical filtration**. Carbon blocks can mechanically filter particles as small as one-half micron (submicron). | ||
| - | 2. **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. | + | - **mechanical filtration**. Carbon blocks can mechanically filter particles as small as one-half micron (submicron). |
| - | 3. **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. | + | - **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. | ||
| - | ===== Compressed vs. Extruded Carbon Block Manufacturing Processes ===== | + | 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. 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. | + | ===== Raw Material Selection ===== |
| - | Compressed carbon blocks are manufactured individually in a mold under great pressure and high heat. | + | |
| - | Compression molding utilizes a more labor intensive manufacturing process with a lower production rate. However, compression molding also provides a final product with more consistent filtration properties, due somewhat to needing less binder material to manufacture a cohesive carbon block. Another advantage of compression molding is the broader array of binding materials from which to choose. Due to the greater temperatures and pressures employed in the compression molding process, specially formulated binders that are more porous may be used to prevent the binder from masking the carbon’s inherent porosity. This results in superior performance and increased capacity when comparing same sized blocks. | + | |
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| - | ===== Carbon Filter Design Parameters — Raw Material Selection ===== | + | |
| There are a variety of raw materials used to make carbon block filters. Some of the most common sources of carbon are bituminous coal, wood, and nutshells. | There are a variety of raw materials used to make carbon block filters. Some of the most common sources of carbon are bituminous coal, wood, and nutshells. | ||
carbon.1552992735.txt.gz · Last modified: 2019/03/19 10:52 by thierry
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