Granular activated carbon Percolation

In the soft drink industry it has become common practice to super-chlorinate water used in processing. It is then percolated through a bed of granular activated carbon to remove any residual chlorine by catalytic action and also to adsorb any remaining taste. 

Nonbiodegradable dissolved organic COD conesponds to macromoleculat OM that is unaffected by biological purification (e.g. sulfonates and naphthenates). It can be measured by slow percolation (space velocity of 2) on granular activated carbon (GAC). 

Soluble nonbiodegradable HC such as aromatics make up a fourth category which rarely but nevertheless effectively undergoes treatment such as steam stripping for high concentrations and percolation on granular activated carbon (GAC) for low concentrations. 

Bone char, the forefather of activated carbon, has long been in the forefront of adsorbents for sugar refining. The granular char is placed in columns through which the hot syrups percolate until the char is exhausted, as evidenced by the appearance of color in the filtrate. The bone char is then regenerated by thermal means for re-use.3... 

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