Coagulation optimization for DOC removal: pilot-scale analysis of UF fouling and disinfection byproduct formation potential

A pilot-scale study was performed to evaluate a coagulant dose which had been optimized for biopolymer (i.e., foulant) removal on subsequent ultrafiltration (UF) fouling, as well as disinfection by-product (DBP) precursor removal. Polyaluminum chloride (PACl) dosages were selected based on a point o...

Full description

Saved in:
Bibliographic Details
Published in:Water science & technology. Water supply 2016-04, Vol.16 (2), p.473-480
Main Authors: Wray, Heather E., Andrews, Robert C., Bérubé, Pierre R.
Format: Article
Language:English
Subjects:
Biopolymers
Byproducts
Carbon
Coagulants
Coagulation
Cost engineering
Cost reduction
Disinfection
Dissolved organic carbon
Drinking water
Environmental science
Experiments
Filtration
Fouling
Halides
Haloacetic acids
Membrane processes
Membranes
Molecular weight
Removal
Singers
Surface water
Trihalomethanes
Ultrafiltration
Water treatment plants
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A pilot-scale study was performed to evaluate a coagulant dose which had been optimized for biopolymer (i.e., foulant) removal on subsequent ultrafiltration (UF) fouling, as well as disinfection by-product (DBP) precursor removal. Polyaluminum chloride (PACl) dosages were selected based on a point of diminishing returns for biopolymer removal (0.5 mg/L) and directly compared to that applied at full-scale (6 mg/L). Membrane fouling (reversible and irreversible) was measured as resistance increase over a 48 hour filtration period. DBP formation potential (total trihalomethanes (TTHMs), haloacetic acids (HAA9) and total adsorbable organic halides (AOX)) were measured in both raw and treated waters. Results of the study indicate that application of a PACl dose optimized for biopolymer reduction (0.5 mg/L) resulted in 65% less irreversible UF fouling when compared to 6 mg/L. The addition of PACl prior to the membrane resulted in up to a 14% reduction in DBP precursors relative to the UF membrane alone. A similar level of DBP precursor reduction was achieved for both 0.5 and 6 mg/L dosages. The results have implications for cost savings, which may be realized due to decreased chemical use, as well as increased membrane life associated with lower irreversible fouling rates.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2015.157