Reducing natural organic matter and disinfection by-product precursors by alternating oxic and anoxic conditions during engineered short residence time riverbank filtration: a laboratory-scale column study

Liu, Peng, Farre, Maria Jose, Keller, Jurg and Gernjak, Wolfgang (2016) Reducing natural organic matter and disinfection by-product precursors by alternating oxic and anoxic conditions during engineered short residence time riverbank filtration: a laboratory-scale column study. Science of the Total Environment, 565 616-625. doi:10.1016/j.scitotenv.2016.05.061


Author Liu, Peng
Farre, Maria Jose
Keller, Jurg
Gernjak, Wolfgang
Title Reducing natural organic matter and disinfection by-product precursors by alternating oxic and anoxic conditions during engineered short residence time riverbank filtration: a laboratory-scale column study
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 1879-1026
0048-9697
Publication date 2016-09-15
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2016.05.061
Open Access Status Not Open Access
Volume 565
Start page 616
End page 625
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2017
Language eng
Formatted abstract
Riverbank filtration (RBF) with days to months of residence time has been successfully used as treatment or pre-treatment process to improve water quality for decades. However, its feasibility depends on the local hydrogeological conditions. Therefore, for sites unsuitable to traditional RBF, a smaller engineered RBF may be an option. This study evaluates the performance of engineered short residence time RBF on improving water quality, focusing on the removal of natural organic matter (NOM) and the reduction of precursors of carbon and nitrogen disinfection by-products (DBP).Lab-scale experiments were conducted with surface feed water from a drinking water plant. The results showed that within 6 days hydraulic retention time (HRT), 60-70% dissolved organic carbon (DOC) and 70-80% ultraviolet absorbance at 254 nm (UV254) could be removed. During the whole filtration process, biodegradation was responsible for the removal of organic matter, and it was found that alternating redox condition between oxic and anoxic was beneficial for the overall performance of the RBF. Dissolved oxygen (DO) had a substantial impact on the removal of DBP precursors. For carbon-containing DBP (C-DBP) precursors' removal, re-aeration after a sequence of oxic and anoxic conditions could further increase the removal efficiencies from 50%, 60%, and 60% to 80%, 90%, and 80% for trihalomethanes (THMs), chloral hydrate (CH), and haloketones (HKs). Prolonged anoxic conditions were however beneficial for the removal of nitrogen-containing DBP (N-DBP) precursors.
Keyword Disinfection by-product precursors
Engineered riverbank filtration
Natural organic matter
Short residence time
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Advanced Water Management Centre Publications
 
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