Treatment of taste and odor causing substances in drinking water

Kim, Young‐Sug; Lee, Yeong-Ho; Gee, Chai Sung; Choi, E.

doi:10.2166/wst.1997.0294

Cited by 20 publications

(17 citation statements)

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“…8b). These results are also in accordance with previous publications (Kim et al, 1997;Ridal et al, 2001) observing better (over 13%) geosmin removal using GAC compared to MIB removal. Notably, ATP measurements demonstrate no significant biological activity was detected on GAC samples from the full-scale contactors.…”

Section: Bench Scale Studysupporting

confidence: 93%

Fate of geosmin and 2-methylisoborneol in full-scale water treatment plants

et al. 2015

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Section: Bench Scale Studysupporting

confidence: 93%

Fate of geosmin and 2-methylisoborneol in full-scale water treatment plants

et al. 2015

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“…The actual amounts removed follow the same pattern as the percentages; however, the latter are shown to facilitate comparison with other studies. For Pilot Filters 2 and 4, the percentage removals of geosmin and MIB increased with an increase in EBCT, as observed in other studies (Ridal et al 2001;Kim et al 1997). The geosmin percentage removals in Pilot Filter 2 increased from 69 to 83% as EBCT was increased from 2.8 to 5 min (new Filtrasorb 820 GAC).…”

Section: Effect Of Empty Bed Contact Time On Filter Efficiency (Expersupporting

confidence: 81%

Using Pilot-Scale Investigations to Estimate the Remaining Geosmin and MIB Removal Capacity of Full-Scale GAC-Capped Drinking Water Filters

Ndiongue

Anderson

Tadwalkar

et al. 2006

Water Quality Research Journal

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Pilot tests were conducted to investigate the removal of geosmin and 2-methylisoborneol (MIB) by new and semi-exhausted granular activated carbon (GAC) extracted from full-scale filters located in the City of Toronto's drinking water treatment facilities. Four pilot filters containing core-sampled GAC and new sand were fed with settled water from a full-scale plant and operated under conditions similar to those employed at full-scale. None of the pilot filters appeared to be capable of reducing geosmin and MIB concentrations to below the commonly cited threshold odour limits of 4 ng/L for geosmin and 9 ng/L for MIB at the influent levels tested. When operated at a 5-min empty bed contact time (EBCT) with geosmin influent concentrations in the range of about 70 to 110 ng/L, removals ranged from 10 to 38% in filters with 25 to 30 cm of used GAC. In the filter with 25 cm of new GAC, removal was 83%. When operated with a 7.5-min EBCT, the filter containing 95 cm of used bituminous GAC removed 78% of the geosmin present in the influent. For both geosmin and MIB, the effluent concentration and the amount removed increased as influent concentration increased, as was expected. In general, geosmin was better removed than MIB.

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“…However, the results indicate an overall trend to better filter performance from a contact of 3 minutes or more. Kim et al (1997) tested the removal of geosmin and MIB by GAC in pilot plants with conventional treatment (flocculation/sedimentation/ rapid sand filtration) and a flow of 20 m 3 /day. They obtained 67±3% removal of geosmin with EBCT of 15 min decreasing to 55±4% removal with EBCT of 10 min.…”

Section: Effect Of Contact Time On Filter Efficiencymentioning

confidence: 99%

Removal of Taste and Odour Compounds by Conventional Granular Activated Carbon Filtration

Ridal

Brownlee

McKenna³

et al. 2001

Water Quality Research Journal

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In recent years, musty-earthy tastes in drinking water have become a seasonal problem (September to November) for communities that draw their water from the upper St. Lawrence River. The source of the problem is attributed to the presence of geosmin and 2-methylisoborneol (MIB) at concentrations ranging from 5 to 60 ng/L. In 1997 and 1998, the Cornwall Water Purification Plant added granular activated carbon (GAC) to conventional gravity filters to control taste and odour compounds. We report on a study to test the efficiency of these conventional GAC-capped filters to reduce geosmin and MIB concentrations in finished water as a function of filter age, initial chlorine residual and contact time. GAC–capped filters removed on average 60% of the MIB and 80% of the geosmin from the source water after 2 and 12 months of filter operation. However, testing after 24 months operation showed reduced efficiency. Amounts removed ranged between 13 and 20% (15% average) for MIB and 50 to 57% (54% average) for geosmin in these filters. Testing also suggested that filter efficiency was greater with longer contact times and with higher chlorine residuals (in the range 0.1 to 0.6 mg free Cl2/L). In addition to carbon age, chlorine residual and contact time, flow channelization and slow release of the taste and odour compound load (particularly MIB) from the GAC bed may affect apparent filter efficiency.

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Treatment of taste and odor causing substances in drinking water

Cited by 20 publications

References 0 publications

Fate of geosmin and 2-methylisoborneol in full-scale water treatment plants

Fate of geosmin and 2-methylisoborneol in full-scale water treatment plants

Using Pilot-Scale Investigations to Estimate the Remaining Geosmin and MIB Removal Capacity of Full-Scale GAC-Capped Drinking Water Filters

Removal of Taste and Odour Compounds by Conventional Granular Activated Carbon Filtration

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