At certain drinking water production locations the water needs to be subjected to a discolouration step. The raw water at these locations contains relatively high levels of humic and fulvic acids, which are not removed by the regular treatment steps.
A very common method of removing these humic and fulvic acids involves the dosing of activated pulverised carbon. The humic and fulvic acids attach to the pulverised carbon, after which the carbon is removed from the water.
The carbon sludge is black and usually has a dry-matter content of 30% when disposed of. It is produced primarily in the provinces of North and South Holland.
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