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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

MIB removal using virgin carbon, and after 3 and 6 months of H2O2 quenching. Similar MIB concentrations were measured in water samples from columns (at all depths) without H2O2 quenching (data not shown).
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f6-ehi-suppl.3-2015-001: MIB removal using virgin carbon, and after 3 and 6 months of H2O2 quenching. Similar MIB concentrations were measured in water samples from columns (at all depths) without H2O2 quenching (data not shown).

Mentions: All GAC types and ages, even virgin GAC, were less efficient for the removal of MIB compared to geosmin. Furthermore, after 3 months of pilot operation, MIB centration in column permeates reached >10 ng/L. However, similar to geosmin removal, the GAC capacities for MIB removal were not significantly affected by the H2O2 quenching, as similar removal values were observed with (Fig. 6) and without (data not shown) H2O2 quenching. Ndiongue et al.45 demonstrated that an increase in GAC depth or EBCT would significantly improve the removal of geosmin and MIB from water. Furthermore, other studies have also observed better (minimum 13%) geosmin removal compared to MIB removal by GAC.46,47


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)

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

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

f6-ehi-suppl.3-2015-001: MIB removal using virgin carbon, and after 3 and 6 months of H2O2 quenching. Similar MIB concentrations were measured in water samples from columns (at all depths) without H2O2 quenching (data not shown).
Mentions: All GAC types and ages, even virgin GAC, were less efficient for the removal of MIB compared to geosmin. Furthermore, after 3 months of pilot operation, MIB centration in column permeates reached >10 ng/L. However, similar to geosmin removal, the GAC capacities for MIB removal were not significantly affected by the H2O2 quenching, as similar removal values were observed with (Fig. 6) and without (data not shown) H2O2 quenching. Ndiongue et al.45 demonstrated that an increase in GAC depth or EBCT would significantly improve the removal of geosmin and MIB from water. Furthermore, other studies have also observed better (minimum 13%) geosmin removal compared to MIB removal by GAC.46,47

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