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A Comprehensive Guide to Activated Carbon Filters! Please click!
Release Date:
2022-12-12
Activated carbon filters are suitable for odor and color removal in municipal water supply systems; water purification in the food industry; advanced treatment in reclaimed water systems; reuse systems for domestic sewage; and removal of heavy metal ions from industrial wastewater. They also serve as ideal pre-treatment equipment for raw water in geothermal water, well water, purified water, reverse osmosis, electrodialysis, ion exchange, and other processes. This product is available in manual and automatic versions: the manual type primarily controls filter operation, cleaning, and backwashing by adjusting valves, while the automatic type uses an automated control head to perform these functions. Filter vessel materials include fiberglass-reinforced plastic tanks, carbon steel tanks, and stainless steel.
Activated carbon filters are suitable for odor and color removal in municipal water supply systems; water purification in the food industry; advanced treatment in reclaimed water systems; reuse systems for domestic wastewater; and removal of heavy metal ions from industrial wastewater. They also serve as ideal pre-treatment equipment for producing purified water in geothermal water, well water, ultrapure water, reverse osmosis, electrodialysis, ion exchange, and other raw-water applications. This product is available in manual and automatic versions: the manual type controls filter operation, cleaning, and backwashing primarily through valve adjustments, while the automatic type uses an automated control head to perform these functions. Filter vessels can be constructed from fiberglass-reinforced plastic, carbon steel, or stainless steel, and can be customized according to customer requirements.
There are two methods for backwashing activated carbon filters: air–water backwashing and water-only backwashing.
1. Air–water backwashing: This method leverages the mutual friction between air bubbles in the ambient air and the granular activated carbon media, as well as the frictional forces among the individual particles of the media itself. Additionally, it utilizes the friction generated when the media is flushed with water. These four factors work synergistically to maximize the effectiveness of the backwash, enabling the activated carbon media to be repeatedly reused after each backwash. This technique is typically employed in filtration tanks with relatively large volumes and coarse-grained filter media. Its advantages include a relatively short backwashing duration and low water consumption.
2. Water backwashing: This method primarily relies on the friction between the activated carbon filter media and the water, as well as the friction among the sand particles, to remove impurities from the water. It consumes a large volume of water; for a small activated carbon filter, the backwashing duration is typically relatively short, with the backwash water volume generally equal to twice the design operating flow rate. Its key features are: no need for an external air supply, significant impact of water consumption, and simple operation.
During transportation, installation, and operation, activated carbon filters must be used in accordance with the specified procedures to ensure optimal performance. Over time, dust accumulates on the surface of the filter media, making backwashing and cleaning difficult, which leads to a decline in the filter’s efficiency and an increase in pressure drop, thereby compromising the cleanliness of the supplied air. Under such circumstances, the activated carbon filter media should be replaced promptly.
To fully leverage the performance of activated carbon filters, during selection and operation, the face velocity should not exceed 2.5 m/s for coarse- and medium-efficiency activated carbon filters, and should not exceed 1.5 m/s for sub-high-efficiency and high-efficiency activated carbon filters. This approach not only helps ensure filter efficiency but also extends service life and reduces costs.
During equipment operation, do not perform filter replacements. If the replacement schedule has been reached and it is impossible to shut down the system for the replacement, only the coarse- and medium-efficiency activated carbon filters may be replaced without stopping the fan. However, before replacing the sub-high-efficiency and high-efficiency activated carbon filters, air flow must be completely halted. Furthermore, the connection frame between the activated carbon filter and its gasket must be tightly sealed with no leaks to ensure optimal filtration performance.
Keywords:
Activated carbon filter
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