AWWA B605-18 pdf download.Reactivation of Granular Activated Carbon
The following definitions shall apply in this standard:
1. Activated carbon: A family of carbonaceous substances manufactured by processes that develop internal porosity, thereby creating adsorptive properties.
2. Adsorption: A process in which dissolved substances are concentrated on a surface by chemical forces, physical forces, or both.
3. Bag: A plastic, paper, or woven container that may contain approximately 2.0–5.0 ft 3 of GAC.
4. Bulk containers: These are specially constructed trucks that may contain 20,000–40,000 lb of GAC.
5. Commingled GAC: A mixture of spent media from different spent media sources so long as the GAC was used for potable water treatment. Reactivated/ regenerated media from a single source that are mixed with virgin media are not considered to be commingled.
6. Custom segregated reactivation (custom reactivation): A process that segregates a purchaser’s spent GAC such that it is stored and reactivated with no intermingling with a spent GAC from another source. Thus, the purchaser receives back the original GAC in a reactivated condition.
7. Day: A day is defined as a 24-hour period.
8. Effective size: That size sieve opening that will just pass 10 percent of a representative sample of a filter material. For example, if the size distribution of the particles is such that 10 percent of a sample is finer than 0.45 mm, the filter material has an effective size of 0.45 mm.
9. Extruded activated carbon: A form of granular activated carbon in which the particles are uniform cylinders or cylindrical pellets. Effective size and uniformity coefficient are not applicable for extruded carbons. The diameter is normally listed.
10. Makeup GAC: Virgin GAC or additional reactivated GAC from the same potable water facility that is used to account for spent GAC losses that occur during transport, handling, and reactivation of a spent GAC. Commingled reactivated GAC may be used if approved by state or local regulations and with approval by the purchaser.
11. Manufacturer: The party that manufactures, fabricates, or produces materials or products.AWWA B605-18 pdf download.