Atrazine Removal Using Ozone and GAC: a Pilot Plant Study

Hulsey, Robert A.; Randtke, Stephen J.; Adams, Craig D.; Long, Bruce W.

doi:10.1080/01919519308552486

Cited by 14 publications

(4 citation statements)

References 11 publications

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“…in literature, which are, moreover, mostly derived from experiences on river or drinking water where pesticide concentrations and ozone demand due to other other organic substances are much lower (Adams & Randtke, 1992;Foster et al, 1994;Hulsey et al, 1993). Such result depends on the contribution of biomass to the removal of pesticides and is in agreement with other experiences reported in literature.…”

Section: Discussionsupporting

confidence: 82%

Removal of Pesticides by a Combined Ozonation/Attached Biomass Process Sequence

Mezzanotte

Canziani

Sardi³

et al. 2005

Ozone: Science & Engineering

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Different combinations of ozonation and biological treatments were tested on an industrial effluent containing high pesticide concentrations. Ozonation was performed in 450 L columns at 1.5 h HRT each. Biological treatment was carried out in a submerged filter (BIOFOR). Ozone was effective in removing herbicides but dosages up to 1000 mg L -1 were needed. The improved biodegradability of the organic compounds after pre-ozonation was demonstrated by Oxygen Uptake Rates (OUR) tests and by the efficiency of biological treatment towards COD, and pesticides. The Italian discharge limit of 50 ppb total pesticides was achieved by combining pre-ozonation, biological treatment, and postozonation.

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Section: Discussionsupporting

confidence: 82%

Removal of Pesticides by a Combined Ozonation/Attached Biomass Process Sequence

Mezzanotte

Canziani

Sardi³

et al. 2005

Ozone: Science & Engineering

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“…Control. Treatment technologies for control of synthetic organic chemicals (SOCs), such as TCT, in drinking water can be organized into broad groups: partitioning processes that separate or concentrate SOCs, such as physisorption on activated carbon or other sorbents ( − ), membrane separation (), ion exchange, and air stripping. Transformation processes can chemically modify the parents, such as oxidation with disinfectants such as chlorine ( , ), chlorine dioxide, ozone ( − ), and peroxide, direct or indirect photolysis with UV, catalyzed oxidation, advanced oxidation with hydroxyl-radical-mediated reactions, or biofiltration ( , ).…”

Section: Introductionmentioning

confidence: 99%

Occurrence and Removal of Chloro-s-Triazines in Water Treatment Plants

Jiang

Adams

Graziano

et al. 2006

Environ. Sci. Technol.

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Atrazine, simazine, and propazine and their major chlorinated degradates (deethylatrazine, deisopropylatrazine, and didealkylatrazine) are considered as a group to be endocrine-disrupting chemicals by the U.S. Environmental Protection Agency. On this basis, regulatory action levels are currently under consideration for the total chloro-s-triazine (TCT) levels in drinking waters. To assess the concentrations of each of these species in drinking water and their treatability in conventional water treatment, a comprehensive, full-scale studywas conducted that included frequent monitoring at 33 and 47 water utilities during 2003 and 2004, respectively. Approximately 900 paired raw and treated water samples were analyzed using a gas chromatography/mass spectrometry method with preconcentration using a mixed-mode, solid-phase extraction that allowed quantitation of each species including didealkylatrazine. The results showed that atrazine concentrations were generally well within the 3 microg/L maximum contaminant level (MCL) and that simazine and propazine concentrations were generally negligible. Ninety-fifth-percentile values for the ratio of TCT/atrazine were 4.8 and 4.7, respectively. Effectiveness of conventional treatment technologies, including carbon, was observed to vary significantly. Concerns that didealkyatrazine concentrations may be high and significantly elevate the TCT appear to be unfounded. In general, the results suggest that potential treatment requirements for TCT are not likely to be any more difficult for utilities to meet than the current requirements for atrazine.

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“…Intermediates formed included N-methylisonicotinic acid and amidic compounds, the latter of which were oxidized to nitrate. Hulsey et al ( 1993) found that small ozone doses (3 mg ' L) could oxidized more than 80% of the herbicide atrazine. Byproducts formed included deethylatrazine and deisopropylatrazine.…”

Section: Oxidation /Reducfionmentioning

confidence: 99%