Controlling adsorbable organic halogens (AOX) and trihalomethanes (THM) formation by ozonation and two-step granule activated carbon (GAC) filtration

A pilot plant study in four parallel filter runs was performed in order to determine the effect of ozonation and two-step granular activated carbon (GAC) filtration on the removal of disinfection by-product (DBP) precursors. The results showed that ozonation significantly decreased the adsorbable or...

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Bibliographic Details
Published in:Water science and technology 1999, Vol.40 (9), p.249-256
Main Authors: VAHALA, R, LANGVIK, V.-A, LAUKKANEN, R
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Adsorptivity
Applied sciences
Biofilters
Biofiltration
chloramine
Chlorine
Chlorine compounds
Disinfection
Drinking water and swimming-pool water. Desalination
Exact sciences and technology
Filters (for fluids)
Filtration
Halogen compounds
Halogens
Lakes
Mutagenesis
Mutagenicity
Organic matter
Ozonation
Ozonization
Pollution
Removal
Trihalomethanes
Water distribution systems
Water filtration
Water purification
Water treatment and pollution
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Summary:A pilot plant study in four parallel filter runs was performed in order to determine the effect of ozonation and two-step granular activated carbon (GAC) filtration on the removal of disinfection by-product (DBP) precursors. The results showed that ozonation significantly decreased the adsorbable organic halogens (AOX) (35%), simulated distribution system (SDS) AOX (37%) and SDS trihalomethanes (THM) (76%) from chemically treated and sand-filtered lake water, but did not decrease either short-term or the long-term chlorine demand. Biofiltration with exhausted GAC had a minor importance in the precursor removal (0-20%). The performance of adsorptive GAC filtration was strongly dependent on the age of the GAC filter bed, which was also seen as a strong correlation between the natural organic matter (NOM) measurements and DBP formation potential. Disinfection with chloramine produced lower THM, AOX, mutagenicity and MX (Z-3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone) levels compared to chlorine disinfection.
ISSN:0273-1223
1996-9732
DOI:10.1016/S0273-1223(99)00663-0