Removal Of Natural Organic Matter By
Conventional And Enhanced Coagulation
In Nicaragua
Author(s)
I. García & L. Moreno
Abstract
Enhanced coagulation was applied to raw water from a drinking water plant in
Nicaragua through bench scale jar test in order to reduce the presence of natural
organic matter (NOM) and decrease the trihalomethanes (THMs) formation
which has been linked to carcinogenic diseases. Due to the lack of information
about the presence of chlorination by-products (CBPs) like trihalomethanes, a
study of their formation by varying pH, contact time, temperature and chlorine
dose was also performed; following conventional or enhanced coagulation
treatment. The results show that enhanced coagulation decreases considerably
the formation of THMs because it reduces strongly the presence of organic
matter due to the fact that higher alum doses were used in comparison with
conventional coagulation utilized at the facility. The removal of dissolved
organic carbon (DOC) was improved from 44% at the facility to 67% with
enhanced coagulation. Trihalomethanes concentration increases drastically when
extreme conditions of the four parameters evaluated were applied exceeding the
maximum contaminant levels of USEPA (80 µg/L) but not the Nicaraguan target
value (460 µg/L) for both coagulation types.
Keywords: enhanced coagulation, fulvic acid, humic acid, natural organic
matter, SUVA, trihalomethanes.
Keywords
enhanced coagulation, fulvic acid, humic acid, natural organic
matter, SUVA, trihalomethanes.
Related Book
Other papers in this volume
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