Usually, BAF is a biological aerated filter, and GAC granular activated carbon. So completely different systems - one is biological removal, the other adsorption.
if you meant BAC (biological activated carbon) then that is a GAC system operated with some air with the aim of encouraging biomass growth on the activated carbon to degrade some of the adsorbed organics.
Dear Alagar
I agree with Dr Jermey
BAF is a biological aerated filter, while GAC granular activated carbon
there are two different systems.
here you can find papers about Combination of ozonation and biological aerated filter (BAF) for bio-treated coking wastewater and for domestic waste water
http://www.sciencedirect.com/science/article/pii/S1383586614003669
https://www.researchgate.net/publication/26694623_The_Biological_Aerated_Filter_BAF_as_alternative_treatment_for_domestic_sewage_Optimization_of_plant_performance
alos here you can find a paper about Combination of ozonation, activated carbon, and biological aerated filter for advanced treatment of dyeing wastewater for reuse.
https://www.ncbi.nlm.nih.gov/pubmed/25843826
all the best
Article The Biological Aerated Filter (BAF) as alternative treatment...
Odour problems can arise in all types of raw waters.
• Many of these problems occur either from algae blooms or discharges from industries.
• Sometimes substances with weak odour characteristics may be transformed by chlorine to substances
with strong odour (phenol ? chlorphenol, THM-precursors ? THM) by the treatment
process (prechlorination).
• Newly formed THMs, or already existing THM-levels, will be partially removed by ozone/GAC
filter significantly in a steady state phase.
• Ozone is an excellent chemical to eliminate odour problems. If THM precursors are present in the
raw water ozone will reduce them significantly.
• The combination ozone/GAC is the most effective technique to eliminate organic matter.
• The mutagenicity of a raw water will be reduced by ozone as major oxidising agent and even
improved by a downstream GAC filter.
• About one third of the DOC can be removed with the combination ozone plus GAC as a steady
state result.
• Higher fraction of DOC can be successfully removed if the GAC is operated as adsorptive filter.
This will definitely produce higher operating costs, either by reactivation or by complete exchange
of GAC filter material.
• Especially where a GAC filter is operated as a biological active filter, a significant part of the
AOC will be removed.
• The risk of bacterial regrowth in the network is therefore minimised.
• Furthermore, the lifetime of the GAC can be improved drastically and in some cases no reactivation
is necessary, resulting in a substantial saving of operating cost.
• The combination ozone/GAC will minimize the addition of any oxidizing chemical to the final
treated water. This will eliminate the problem of creating a new odor problem by such chemicals.
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