REMOVAL OF HUMIC SUBSTANCES IN WATER BY COAGULATION

Danka BARLOKOVÁ, Ján ILAVSKÝ

Abstract

Basic characteristics of humic substances and their negative influence on water quality and its treatment are described in the paper. Humic substances are unwanted therefore their removal is
necessary. This can be done by coagulation which plays an important role in surface water treatment. This  statement was confirmed in laboratory experiments.  In order to remove humic substances from surface  water  of  the  water  reservoir  in  Hri Ė ová  coagulation  was  used.  As  the  coagulation  reagent either  ferric  sulfate  or  aluminium  sulfate  was  used  as  well.  An  optimum  coagulant  dosage  was soughed. A treatment with ferric sulfate as well as aluminium sulfate can be sufficient if the acceptable limit  for  humic  substances  is  2.5  mg/L,  our  experiments  showed.  To  reach  a  reduction  of  humic substance contents below its level of 1 mg/L dosage of 16 mg/L of 1% solution Fe2(SO4)3  (Prefloc), which is the equivalent of 4,47 mg/L Fe3+ was sufficient.

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