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World Journal of Engineering Research and Technology

( An ISO 9001:2015 Certified International Journal )

An International Peer Reviewed Journal for Engineering Research and Technology

An Official Publication of Society for Advance Healthcare Research (Reg. No. : 01/01/01/31674/16)

ISSN 2454-695X

Impact Factor : 7.029

ICV : 79.45

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Indexing

Abstract

INVESTIGATION OF THE EFFECTS OF FINES CONSISTENCY ON FINES FLOCCULATION USING COFACTOR-POLYETHYLENE OXIDE SYSTEM AND FIND OUT THE AFFECTIVE PARAMETERS

Dr. Mohammad Raji Abdallah Qasaimeh*

ABSTRACT

The objective of this work was to investigate the effect of the finesconsistency ( ) fn C on the fines flocculation characteristics using a cofactor(CF) - polyethylene oxide (PEO) retention aid. One result of this work hasshown that the floc size (A) and the flocculation rate ( ) f r started toincrease with the increase in the fn C , reached maximum, plateaued andthen started to decrease. Deflocculation with the rate ( ) d r was alsorecorded in the all runs. The flocculation rate constant ( ) f k , thedeflocculation rate constant ( ) d k , and the reverse equilibrium constant( ) equi K were all determined and plotted versus the fn C . The flocculation rates as functions of thefn C values were verified with Longmuir equation and Smoluschowski isotherm, and theattachment rate constants ( ) att k were found. The increase in f r with the increase in fn C wasascribed to the increase in the collision frequency () that caused increases in both theattachment forces and the countered viscous forces. When the rate f r reached maximum, theattachment forces balanced the viscous forces, but with more increase in fn C the viscous forcesincreased over the attachment forces, thus resulting negative slopes (negative att k ) and a decreasein flocculation rate f r .

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