Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Industrial Additives Functions
- Technologies
Features & Benefits
- Industrial Additives Features
- Features
- Calgon Carbon’s reagglomerated coal-based granular activated carbons have several properties which provide superior performance in a wide range of applications
- Produced in the United States from a pulverized blend of high quality, domestically mined bituminous coals resulting in a consistent, high quality product.
- Carbon granules are uniformly activated through the whole granule, not just the outside, resulting in excellent adsorption properties and constant adsorption kinetics.
- The reagglomerated structure ensures proper wetting while also eliminating floating material.
- High mechanical strength relative to other raw materials, thereby reducing the generation of fines during backwashing and hydraulic transport.
- Carbon bed segregation is retained after repeated backwashing, ensuring the adsorption profile remains unchanged and therefore maximizing the bed life.
- Reagglomerated with a high abrasion resistance, which provides excellent reactivation performance.
- High density carbon resulting in a greater adsorption capacity per unit volume.
- Recycling and Reactivation
Though FILTRASORB is 100-percent freshly manufactured virgin GAC, it can be recycled and reused through thermal reactivation to restore its adsorptive capacity. This eliminates the costs and long-term liability associated with the disposal of spent GAC, and provides customers with a consistent, reliable supply of filtration media.
Applications & Uses
- Markets
- Applicable Processes
- Applications
- Industrial Wastewater
- Groundwater
- Surface Water
- Pond/Aquarium/ Swim
- Bottle & Brewing
- Water Processing
- Pharmaceuticals
- Environmental Water
- Food & Beverage
- Drinking Water Industrial
- Water Reuse
- Drinking Water (Potable)
- Granular Activated Carbon
- Municipal
- Reactivation
FILTRASORB 820 is used primarily to treat surface water sources for the production of drinking water. This carbon is a coarser mesh media and is generally used in deep bed filters where pressure drop may be a concern. FILTRASORB 820 functions as a dual purpose media providing both filtration and adsorption.
Properties
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Apparent Density (Tamped) | 0.58 | g/cc | - |
| Effective Size | 1 - 1.2 | mm | - |
| Non-Wettable | max. 1 | % | - |
| Water Extractables | max. 1 | % | - |
| Uniformity Coefficient | max. 1.5 | - | - |
| Moisture Content (by Weight) | max. 2 | % | - |
| Screen Size (by Weight, US Sieve Series Through 20 mesh) | max. 4 | % | - |
| Screen Size (by Weight, US Sieve Series on 8 mesh) | max. 5 | % | - |
| Abrasion Number | min. 75 | - | - |
| Trace Capacity Number | min. 9 | mg/g | - |
| Iodine Number | min. 900 | mg/g | - |
Regulatory & Compliance
- Regulatory
FILTRASORB 820 is also formulated to comply with all the applicable provisions of the AWWA Standard for Granular Activated Carbon (B604), the stringent extractable metals requirements of NSF/ANSI 61, and the Food Chemicals Codex.
Technical Details & Test Data
- Typical Pressure Drop
Down Flow Pressure Drop at 13°C/55°F
Based on a backwashed and segregated bed
- Process
This activated carbon is made from select grades of bituminous coal through a process known as reagglomeration to produce a high activity, durable, granular product capable of withstanding the abrasion associated with repeated backwashing, hydraulic transport, and reactivation for reuse. The raw coal is mined and subsequently manufactured into GAC in the United States to ensure the highest quality and consistency in the finished product. Activation is carefully controlled to produce a significant volume of both low and high energy pores for effective adsorption of a broad range of high and low molecular weight organic contaminants.
- Typical Bed Expansion During Backwash
Bed Expansion During Backwash at 13°C/55°F
Based on a backwashed and segregated bed
- Conditioning and Backwashing
Backwashing and conditioning fresh GAC before placing into operation is critical to GAC performance. The reasons for backwashing before placing fresh media online are to: (1) size segregate the media so subsequent backwashing will return the media to the same relative position in the bed, (2) remove any remaining air from the bed, and (3) remove media fines which can lead to excessive pressure drop and flow restriction. In addition, proper backwashing is a crucial step to collecting the most representative and meaningful post-start up data on compounds of interest, such as metals listed in the NSF/ANSI 61 standard.
Below are the recommended steps for proper conditioning and backwashing of GAC based on Filtrasorb 820 GAC being backwashed at 55°F:
- Fully submerge GAC bed in clean, contaminant free water for at least 16 hours (overnight)
- Open backwash inlet and begin up-flow at 7 gpm/ft2 for 2 minutes
- Increase flow to 11 gpm/ft2 and maintain for 2 minutes
- Increase flow to 15 gpm/ft2 and maintain for 2 minutes
- Increase flow to 18.5 gpm/ft2 and maintain for 30 minutes (Duration representative of initial backwash conditions. Required duration during operational backwashes can be shorter but will vary by utility, solids load, and GAC throughput. Contact Calgon Carbon for more information)
- Decrease flow to 15 gpm/ft2 and maintain for 2 minutes
- Decrease flow to 11 gpm/ft2 and maintain for 2 minutes
- Decrease flow to 7 gpm/ft2 and maintain for 2 minutes
- Close backwash inlet and stop flow
- Design Considerations
As a replacement for existing filter media, the conversion to FILTRASORB 820 activated carbon imposes no major changes to a plant’s normal filtration operations. If more contact time is required, the height of the backwash troughs can be increased. Calgon Carbon Corporation can also provide complete modular adsorption systems as an add-on treatment stage if required.
Safety & Health
- Safety
Wet activated carbon can deplete oxygen from air in enclosed spaces. If use in an enclosed space is required, procedures for work in an oxygen deficient environment should be followed.