I am looking for a definite percent range removal for Trihalomethane (THM) and Halo acetic acid (HAAs) by Granular Activated Carbon filters in Water Treatment processes. Till now, after some literature review, I could find out that the removal efficienciey for THM is abot 90-96% and HAAs is about 80% by GAC.
It is difficult to say anything just based on your question. Generally, the potential formation of TMHs and HAAs are largely dependent on the characteristics of DOM/NOM, which is also varying upon the biochemical degradation of terrestrial residues and hydrological pattern of a given aquatic system i.e. allochthonous or autochthonous origins. Secondly, unlike PAC, GAC is commonly installed as a tertiary treatment process. Pretreatment step can also influence the properties of DOM. In general, I can say 80-90% of DBPs removal is relatively high for a freshwater treatment by GAC solely.
There cannot be a defenite removal. In each case this will depend on the water matrix, size of the filter (contact time) and now much of the capacity of the carbon that is spend (time of use). In a large filter with new GAC the removal will be close to 100 % for both groups.
The % removal depends on many factors like initial concentration of TMHs and HAA in the water, amount of GAC used in the filter, flow rate of contaminated stream etc.
Instead of %removal, the % elimination provide more reliable picture of the removal.%Removal along with % Elimination is best approach and provide exact picture of effectiveness of the process.
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