AI SearchApplication of in-line flocculation microfiltration with pulsation cleaning technique
Call Number: AIT Thesis no. EV-90-15 Material type:
SeriesSeries: Asian Institute of Technology. Thesis ; no. EV-90-15Publication details: Bangkok : Asian Institute of Technology, 1990Description: 102 pSubject(s): Online resources: Dissertation note: Thesis (M.Eng.) - Asian Institute of Technology, 1990 Summary: Crossflow microfiltration is a pressure driven membrane process allowing better permeate flux by shearing action of flow. It can remove most of the impurities found in water and wastewater. But there are still main problems to be solved due to fouling, deposition and internal clogging , which reduce the efficiency of separation. In-line flocculation microfiltration with pulsation cleaning technique is one of the desirable techniqes to avoid or minimize these drawbacks. Laboratory-scale microfiltration with Kaolin clay suspension was carried out to study the effect of pulsation cleaning technique at various pulsation time of flux. It was found that the higher permeate flux was obtained when the operation of pulsation was more frequent . Also the study performed showed that this technique improved the permeate flux by 63 % up to certain time of filtration (in this experiment 50 minutes filtration) and does not affect much from that time on. A series of experiments conducted with alum dose showed that there was no significant influence both of pulsation cleaning technique and of alum dose on turbidity removal in Kaolin clay suspension although in-line alum addition in microfiltration increased the permeate flux significantly. In domestic wastewater treatment, alum and PAC were added as a flocculant and adsorbent respectively to investigate the performance of this system. There was a clear optimum of alum and PAC dose which corresponded to maximum flux. An increase in f locculant and adsorbent dose above this optimum value did not result in an increase in permeate flux. But more alum and PAC doses produced better effluent quality (i.e. lower effluent COD, TKN and T-P ) . The comparison of pulsation performance at different chemicals doses indicated that this technique was more effective in improving the permeate flux when PAC along with alum was added than no chemicals or any alum was added. The improvement was around 26 %.
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A thesis submitted in partial fulfilment of the requirements for the degree of Master of engineering, School of Environment, Resources and Development
Thesis (M.Eng.) - Asian Institute of Technology, 1990
Crossflow microfiltration is a pressure driven membrane process allowing better permeate flux by shearing action of flow. It can remove most of the impurities found in water and wastewater. But there are still main problems to be solved due to fouling, deposition and internal clogging , which reduce the efficiency of separation. In-line flocculation microfiltration with pulsation cleaning technique is one of the desirable techniqes to avoid or minimize these drawbacks. Laboratory-scale microfiltration with Kaolin clay suspension was carried out to study the effect of pulsation cleaning technique at various pulsation time of flux. It was found that the higher permeate flux was obtained when the operation of pulsation was more frequent . Also the study performed showed that this technique improved the permeate flux by 63 % up to certain time of filtration (in this experiment 50 minutes filtration) and does not affect much from that time on. A series of experiments conducted with alum dose showed that there was no significant influence both of pulsation cleaning technique and of alum dose on turbidity removal in Kaolin clay suspension although in-line alum addition in microfiltration increased the permeate flux significantly. In domestic wastewater treatment, alum and PAC were added as a flocculant and adsorbent respectively to investigate the performance of this system. There was a clear optimum of alum and PAC dose which corresponded to maximum flux. An increase in f locculant and adsorbent dose above this optimum value did not result in an increase in permeate flux. But more alum and PAC doses produced better effluent quality (i.e. lower effluent COD, TKN and T-P ) . The comparison of pulsation performance at different chemicals doses indicated that this technique was more effective in improving the permeate flux when PAC along with alum was added than no chemicals or any alum was added. The improvement was around 26 %.
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