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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

Chemical structure of (A) geosmin and (B) MIB.21,22
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Related In: Results  -  Collection


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f1-ehi-suppl.3-2015-001: Chemical structure of (A) geosmin and (B) MIB.21,22

Mentions: Geosmin and 2-methylisoborneol (MIB) are the most commonly detected T&O compounds associated with cyanobacterial presence in drinking water sources.19,21–23 Their characteristics and chemical structure are shown in Figure 1. Additionally, production of neurotoxic anatoxins and hepatotoxic microcystins by T&O-producing species has been reported.22 The presence of geosmin and MIB has been mainly recorded during the warm summer season and/or early autumn during bloom lysis period.24 Hence, cyanobacterial T&O issues are perceived as a temporary issue. Consequently, management and treatment adjustment information are focused on temporary options, such as addition of powdered activated carbon only during the bloom season and/or detection of a bloom event.19 However, full-year monitoring results have documented the presence of these T&O compounds and their producing cells during cold season or pre/postbloom season.25,26 Furthermore, assessment of existing treatment trains for the removal of harmful cyanobacterial metabolites has demonstrated the vulnerability of these barriers to climate change scenarios.27


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)

Chemical structure of (A) geosmin and (B) MIB.21,22
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1-ehi-suppl.3-2015-001: Chemical structure of (A) geosmin and (B) MIB.21,22
Mentions: Geosmin and 2-methylisoborneol (MIB) are the most commonly detected T&O compounds associated with cyanobacterial presence in drinking water sources.19,21–23 Their characteristics and chemical structure are shown in Figure 1. Additionally, production of neurotoxic anatoxins and hepatotoxic microcystins by T&O-producing species has been reported.22 The presence of geosmin and MIB has been mainly recorded during the warm summer season and/or early autumn during bloom lysis period.24 Hence, cyanobacterial T&O issues are perceived as a temporary issue. Consequently, management and treatment adjustment information are focused on temporary options, such as addition of powdered activated carbon only during the bloom season and/or detection of a bloom event.19 However, full-year monitoring results have documented the presence of these T&O compounds and their producing cells during cold season or pre/postbloom season.25,26 Furthermore, assessment of existing treatment trains for the removal of harmful cyanobacterial metabolites has demonstrated the vulnerability of these barriers to climate change scenarios.27

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