10.1021/es301905n.s001
Zhikang Wang
Zhikang
Wang
Junsung Kim
Junsung
Kim
Youngwoo Seo
Youngwoo
Seo
Influence of Bacterial
Extracellular Polymeric Substances
on the Formation of Carbonaceous and Nitrogenous Disinfection Byproducts
American Chemical Society
2016
aeruginosa EPS
Bacterial Extracellular Polymeric Substances
HAA species
dichloroacetic acid
chemical composition
water distribution systems
EPS content
DBP formation
nitrogen content
Pseudomonas strains
haloacetic acids
Nitrogenous Disinfection ByproductsConsidering
carbonaceous DBPs
disinfection byproduct
chlorine
putida EPS
nitrogenous DBPs
2016-02-20 08:54:34
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Influence_of_Bacterial_Extracellular_Polymeric_Substances_on_the_Formation_of_Carbonaceous_and_Nitrogenous_Disinfection_Byproducts/2477833
Considering the regulatory presence of residual chlorine
in water
distribution systems, untreated organic matter may not be the sole
contributor to disinfection byproduct (DBP) formation, given the presence
of microbial biofilm with extracellular polymeric substances (EPS).
This study investigated the influence of bacterial EPS on the formation
of carbonaceous DBPs (C-DBPs) and nitrogenous DBPs (N-DBPs), reacting
chlorine with <i>Pseudomonas</i> strains that produce different
quantities and composition of EPS. When biomass is reacted in excess
to chlorine, both C-DBPs and N-DBPs were produced without preference
for speciation. However, under an excess of chlorine compared to biomass,
increased EPS content led to enhanced formation of DBPs. The DBP yield
of haloacetic acids (HAAs) was higher than that of trihalomethanes
where dichloroacetic acid was dominant in HAA species. Additionally,
chemical composition of EPS influenced the yields of DBPs. The N-DBP
yield from <i>P. putida</i> EPS was two times higher than
that of <i>P. aeruginosa</i> EPS, which suggested that higher
organic nitrogen content in EPS contributes to higher N-DBP yield.
Moreover, time-based experiments revealed that DBP formation from
biomass occurs rapidly, reaching a maximum in less than four hours.
Combined results suggest that bacterial EPS have significant roles
in both the formation and fate of DBPs.