An advanced treatment involving purification if the treatment of water during trickling filter is?
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Answer:
Over the last 40 years all TF's in the EU that I knew have been replaced by CAS or AAS because of its inherent limitations even when well designed and built. A TF is a biofilm system which implies that it can only metabolize "fast food" and mineral nutrients (ammonia, phosphate, ...) at sufficient concentration (concentration gradient needed) to diffuse through the biofilm as to get to the encapsulated microbes (mainly bacteria). In addition TF is a blackbox for process control because it is impossible to monitor and control the operating conditions at microbial level within the biofilm as opposed to suspended growth systems like CAS and AAS. Hence the only process control in TF is the recycle flow rate.
I agree about the waste solids in terms of SVI as compared to most CAS systems because CAS has no/little means to control the biosludge quality in terms of density and microbial activity as opposed to AAS. That's why many CAS system struggle with light and bulking sludge (SVI > 200 ml/gDS).
Explanation: