es301905n_si_001.pdf (149.3 kB)
Influence of Bacterial Extracellular Polymeric Substances on the Formation of Carbonaceous and Nitrogenous Disinfection Byproducts
journal contribution
posted on 2016-02-20, 08:54 authored by Zhikang Wang, Junsung Kim, Youngwoo SeoConsidering 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 Pseudomonas 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 P. putida EPS was two times higher than
that of P. aeruginosa 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.
History
Usage metrics
Categories
Keywords
aeruginosa EPSBacterial Extracellular Polymeric SubstancesHAA speciesdichloroacetic acidchemical compositionwater distribution systemsEPS contentDBP formationnitrogen contentPseudomonas strainshaloacetic acidsNitrogenous Disinfection ByproductsConsideringcarbonaceous DBPsdisinfection byproductchlorineputida EPSnitrogenous DBPs
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC