| Summary: | An investigation was conducted focusing on how NOM affects coagulation in a United States south eastern coastal surface water. Current water treatment practice at Savannah Water I and D was
investigated to determine the efficacy of NOM removal using existing coagulation
methods. A robust assessment of alum and ferric sulfate for use as coagulants in the
removal of disinfection byproduct (DBP) precursor material was conducted using
composite water created from sample sites within the SWID watershed. Both coagulants
were optimized for the removal of NOM.
Pragmatic methods of NOM size analysis and its reactivity with chlorine was
investigated. UF membranes were used in conjunction with a permeation coefficient
model (PCM) to determine an apparent molecular weight distribution of NOM present in
the watershed. Individual size classes were assessed for their potential to form
trihalomethanes (THMs) upon chlorination. Coagulation using alum and ferric sulfate
was assessed to determine removal efficiency of individual NOM size classes under
various coagulation scenarios.
Finally, UV254 absorbance (UVA) was assessed to determine its potential use as an
indicator of DOC concentration in raw and treated water at SWID. Additionally, an
investigation into the relationship between specific UVA (SUVA) and THM formation
potential (THM-FP) was conducted.
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