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The impact of physico-chemical water treatment on a novel flotation/filtration process

Scriven, RJ, Ouki, SK, Doggart, AS and Bauer, MJ (1999) The impact of physico-chemical water treatment on a novel flotation/filtration process

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Recent research explored the application of mechanical flocculation ahead of a novel flotation/filtration process (Counter Current Dissolved Air Flotation/Filtration -- COCO DAFF(TM)) and compared it to the process performance seen when hydraulic flocculation was used. The energy input to the system, expressed in terms of the mean velocity gradient, G (s-1), and retention time, t, were used as a guideline for comparison between the two types of flocculation. Generally, better COCO DAFF(TM) performance resulted from using mechanical flocculation as against that using hydraulic flocculation. High G values (in excess of 80 s-1) were found to give best results, as opposed to values of 30-60 s-1 utilised ahead of conventional treatment. The effect of flocculation contact time on the COCO DAFF(TM) process was also studied. Current design practice typically utilises 20-30 minutes flocculation contact time. It was found that process performance, in terms of water quality, did not deteriorate excessively if the contact time was reduced to as little as 2 minutes, but filter run times were found to be proportional to contact time.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions : Surrey research (other units)
Authors :
Scriven, RJ
Doggart, AS
Bauer, MJ
Date : 1999
DOI : 10.1016/S0273-1223(99)00279-6
Uncontrolled Keywords : Flocculation contact time, Counter Current Dissolved Air Flotation/Filtration (COCO DAFF(TM)), hydraulic flocculation, mean velocity gradient, G, mechanical flocculation
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 11:00
Last Modified : 23 Jan 2020 16:20

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