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Impact of UV-H2O2 Advanced Oxidation and Aging Processes on GAC Capacity for the Removal of Cyanobacterial Taste and Odor Compounds.

Zamyadi A, Sawade E, Ho L, Newcombe G, Hofmann R - Environ Health Insights (2015)

Bottom Line: Geosmin and 2-methylisoborneol (MIB) are the most commonly detected T&O compounds associated with cyanobacterial presence in drinking water sources.However, residual H2O2 (>80% of the initial dose) has to be removed from water prior final disinfection.Recently, granular activated carbon (GAC) is used to remove H2O2 residual.

View Article: PubMed Central - PubMed

Affiliation: UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales (UNSW), Sydney, New South Wales, Australia. ; Department of Civil Engineering, University of Toronto, Toronto, Canada.

ABSTRACT
Cyanobacteria and their taste and odor (T&O) compounds are a growing concern in water sources globally. Geosmin and 2-methylisoborneol (MIB) are the most commonly detected T&O compounds associated with cyanobacterial presence in drinking water sources. The use of ultraviolet and hydrogen peroxide (H2O2) as an advanced oxidation treatment for T&O control is an emerging technology. However, residual H2O2 (>80% of the initial dose) has to be removed from water prior final disinfection. Recently, granular activated carbon (GAC) is used to remove H2O2 residual. The objective of this study is to assess the impact of H2O2 quenching and aging processes on GAC capacity for the removal of geosmin and MIB. Pilot columns with different types of GAC and presence/absence of H2O2 have been used for this study. H2O2 removal for the operational period of 6 months has no significant impact on GAC capacity to remove the geosmin and MIB from water.

No MeSH data available.


Related in: MedlinePlus

Geosmin removal using virgin carbon, and after 3 and 6 months of H2O2 quenching. Similar geosmin concentrations were measured in water samples from columns (at all depths) without H2O2 quenching (data not shown).Note: *BDL, below detection limit.
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f5-ehi-suppl.3-2015-001: Geosmin removal using virgin carbon, and after 3 and 6 months of H2O2 quenching. Similar geosmin concentrations were measured in water samples from columns (at all depths) without H2O2 quenching (data not shown).Note: *BDL, below detection limit.

Mentions: During the operation of the Canadian plant, H2O2 is only dosed during the bloom season (September to November). Therefore, the AOP is only available during this time period as a strong oxidation barrier against T&O compounds in water. For the rest of the operational time, adsorption on GAC is the only treatment process for the removal of these compounds. The pilot study was used to study the impact of H2O2 quenching on GAC capacity to adsorb geosmin and MIB to ensure the efficiency of available treatment barriers at all times. For geosmin treatment, 25–50 cm of virgin GACs were sufficient for the removal of 100 ng/L to below detection limit, which is 2 ng/L (Fig. 5). However, after 3 months of quenching 4 mg/L of H2O2 with an EBCT of 4.1 minutes, the entire 128-cm column depth was required to remove >93% of the geosmin. No significant difference was observed between the geosmin removal capacity of columns with (Fig. 5) and without (data not shown) H2O2 quenching.


Impact of UV-H2O2 Advanced Oxidation and Aging Processes on GAC Capacity for the Removal of Cyanobacterial Taste and Odor Compounds.

Zamyadi A, Sawade E, Ho L, Newcombe G, Hofmann R - Environ Health Insights (2015)

Geosmin removal using virgin carbon, and after 3 and 6 months of H2O2 quenching. Similar geosmin concentrations were measured in water samples from columns (at all depths) without H2O2 quenching (data not shown).Note: *BDL, below detection limit.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4592064&req=5

f5-ehi-suppl.3-2015-001: Geosmin removal using virgin carbon, and after 3 and 6 months of H2O2 quenching. Similar geosmin concentrations were measured in water samples from columns (at all depths) without H2O2 quenching (data not shown).Note: *BDL, below detection limit.
Mentions: During the operation of the Canadian plant, H2O2 is only dosed during the bloom season (September to November). Therefore, the AOP is only available during this time period as a strong oxidation barrier against T&O compounds in water. For the rest of the operational time, adsorption on GAC is the only treatment process for the removal of these compounds. The pilot study was used to study the impact of H2O2 quenching on GAC capacity to adsorb geosmin and MIB to ensure the efficiency of available treatment barriers at all times. For geosmin treatment, 25–50 cm of virgin GACs were sufficient for the removal of 100 ng/L to below detection limit, which is 2 ng/L (Fig. 5). However, after 3 months of quenching 4 mg/L of H2O2 with an EBCT of 4.1 minutes, the entire 128-cm column depth was required to remove >93% of the geosmin. No significant difference was observed between the geosmin removal capacity of columns with (Fig. 5) and without (data not shown) H2O2 quenching.

Bottom Line: Geosmin and 2-methylisoborneol (MIB) are the most commonly detected T&O compounds associated with cyanobacterial presence in drinking water sources.However, residual H2O2 (>80% of the initial dose) has to be removed from water prior final disinfection.Recently, granular activated carbon (GAC) is used to remove H2O2 residual.

View Article: PubMed Central - PubMed

Affiliation: UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales (UNSW), Sydney, New South Wales, Australia. ; Department of Civil Engineering, University of Toronto, Toronto, Canada.

ABSTRACT
Cyanobacteria and their taste and odor (T&O) compounds are a growing concern in water sources globally. Geosmin and 2-methylisoborneol (MIB) are the most commonly detected T&O compounds associated with cyanobacterial presence in drinking water sources. The use of ultraviolet and hydrogen peroxide (H2O2) as an advanced oxidation treatment for T&O control is an emerging technology. However, residual H2O2 (>80% of the initial dose) has to be removed from water prior final disinfection. Recently, granular activated carbon (GAC) is used to remove H2O2 residual. The objective of this study is to assess the impact of H2O2 quenching and aging processes on GAC capacity for the removal of geosmin and MIB. Pilot columns with different types of GAC and presence/absence of H2O2 have been used for this study. H2O2 removal for the operational period of 6 months has no significant impact on GAC capacity to remove the geosmin and MIB from water.

No MeSH data available.


Related in: MedlinePlus