Control of disinfection by products formation potential by enhanced coagulation

Jar-test experiments were conducted to study enhanced coagulation effectiveness in removal of disinfection by products (DBPs) from Zayandehrud River at Isfahan Province-the center part of Iran- in 2004. In this study, the removal of suspended and colloidal particles and natural organic matter (NOM)...

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Published inInternational journal of environmental science and technology (Tehran) Vol. 2; no. 4; pp. 335 - 342
Main Authors Mesdaghinia, A., Rafiee, M. T., Vaezi, F., Mahvi, A., Torabian, A., Ghasri, A.
Format Journal Article
LanguageEnglish
Published Iran Center for Environment and Energy Research and Studies (CEERS) 2006
Springer Nature B.V
Subjects
Acidity
by-products
Coagulation
disinfection
Disinfection & disinfectants
Effectiveness studies
Enhanced coagulation
NOM
TOC removal
UV absorbance
Water treatment
Isfahan Iran
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Summary:Jar-test experiments were conducted to study enhanced coagulation effectiveness in removal of disinfection by products (DBPs) from Zayandehrud River at Isfahan Province-the center part of Iran- in 2004. In this study, the removal of suspended and colloidal particles and natural organic matter (NOM) at various coagulant doses and coagulation pHs was assessed through raw and treated water measurements of turbidity, UV254 absorbance, TOC, and dissolved organic carbon (DOC). The trihalomethane formation potential (THMFP) was also determined by a mathematical relationship with TOC. Results indicated that NOM removal was a function of coagulant type, coagulant dose, and pH of coagulation. In general, TOC, DOC, and UV254 absorbance removal enhanced with increasing coagulant dose. However, further increases in coagulant dosage had little effect on disinfection by-products precursors removal. Ferric chloride was consistently more effective than alum in removing NOM. Coagulation pH was appeared to be a determining factor for maximum NOM removal and the removal of DBPs precursors by enhanced coagulation was significantly enhanced at pH 5.5 in comparison with initial pH of water. Furthermore, it is specified that preadjustment of pH with sulfuric acid reduced the coagulant dosage and thus, production of sludge. The reduction in THMFP was consistent with the trends observed for DBPs precursors removal data (i.e. UV254 and TOC data).
ISSN:1735-1472
1735-2630
DOI:10.1007/BF03325894