The effect of ozonation on the removal of organics by coagulation - Flocculation

Journal Article · · Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States)

DOI:https://doi.org/10.1080/01919519008552198· OSTI ID:5646748

Lefebvre, E; Legube, B ^[1]; Paillard, H

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1. Universite de Poitiers (France)

The results of work on the treatment of reservoir waters, which contain high concentrations of organics, mainly humic substances, are reported here. Previous studies on coagulation of fulvic acid solutions have proved that the optimal removal of organic matter was reached at acidic pH with 2 mg of ferric ion per mg or organic carbon (summarized in this paper). The main question in this study is to know what is the impact of preozonation on the removal of organics by iron (3) coagulation. The study of the behavior of organics, in terms of absorbance and TOC measurements was made on three aquatic fulvic acids and on two raw waters. The experiments carried out with fulvic acids showed that preozonation (at 0.5 mg O{sub 3}/mg C) of fulvic acid appeared to have shifted the region of the optimal DOC removal towards the higher coagulant dose. Furthermore, increasing ozone doses led to a slight decreasing of coagulation efficiency at constant coagulant dose. With two raw waters, preozonation at low ozone doses (0.2 mg O{sub 3}/mg C) was found to improve very slightly the elimination of organic matter, while high ozone doses (0.9 mg/O{sub 3}mgC) led to a disturbance of TOC elimination by iron coagulation.

• OSTI ID: 5646748
• Journal Information: Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States), Journal Name: Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States) Vol. 12:3; ISSN OZSED; ISSN 0191-9512
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320603* -- Energy Conservation
Consumption
& Utilization-- Municipalities & Community Systems-- Public Utilities-- (1980-)
CHEMICAL REACTIONS
DRINKING WATER
FLOCCULATION
FULVIC ACIDS
HYDROGEN COMPOUNDS
IRON COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
OZONE
OZONIZATION
PH VALUE
PRECIPITATION
SEPARATION PROCESSES
SURFACE WATERS
TRANSITION ELEMENT COMPOUNDS
WATER
WATER RESERVOIRS
WATER TREATMENT