treatment supervisor richard miller treatment...
TRANSCRIPT
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Maria Meyer P.E.
Treatment Supervisor
Richard Miller Treatment Plant
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Greater Cincinnati Water Works Service Area
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Where is Our Water Coming From?
• About 84% of the water comes from the Ohio River.
– Treated at the Richard Miller Treatment Plant.
• The remaining water comes from the Great Miami Aquifer.
– The groundwater is treater at the Charles M. Bolton Plant.
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Industrial Ohio River – Barge Traffic
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Contaminant Discharges Into the Ohio River
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Spills Upstream from Plant Intake
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Other Challenges - Runoff, Cyanobacteria
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Groups of Chemical Contaminants Found in Source Waters
• Natural Organic Matter
• Pharmaceuticals
• Personal Care Products
• Synthetic/Volatile Organic Chemicals
• Herbicides, Pesticides
• Endocrine Disruptive Compounds (EDCs)
• Cyanotoxins
• Generally, their concentrations in the Ohio River are low.
• The river water gets screened by chemists multiple times around the clock for certain/regulated organic contaminants.
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Best Available Technology for Removal of Organic Chemicals
• Activated Carbon
• Complex pore structure
• Adsorbs most chemicals
• Granular and Powder
• Granular Activated Carbon (GAC) can be reactivated (reused)
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GCWW: GAC Research (1978 – 1990)
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GAC Facility In Service Since 1992
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GAC Process At The Richard Miller Plant
Solids Removal - Clarification Organics
Removal Disinfection
Fluoridation
GAC
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Full-Scale GAC Contactors
12 Contactors
65 ft. x 30 ft. 1950 ft2
11.5 ft. of carbon
EBCT 15 min.
Flow Rate 7.1gpm/ft2
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GAC Performance: Total Organic Carbon (TOC) Removal
Jan Feb Mar AprMay
JunJul
AugSep
OctNov
Dec
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
TO
C m
g/L
Ohio River
Coag/Sed
Sand Filter Effluent
GAC Effluent
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GAC Contactors: TOC Breakthrough Curves
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Benefit of GAC on Trihalomethane (THM) Precursor Removal
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Benefit of GAC on Haloacetic Acid (HAA) Precursor Removal
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Atrazine Removal by GAC AWWA Atrazine Study
GCWW Data 2003
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
3/19 4/2 4/16 4/30 5/14 5/28 6/11 6/25 7/9 7/23 8/6 8/20 9/3 9/17
pp
b
RAW Sand Filter Eff. GAC Eff. MCL
MCL
2003 AWWA Study
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Removal of Various Synthetic & Natural Organic Chemicals
Source: USEPA/USGS Study 2007
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Removal of Chemical Contaminants Found in Ohio River
• Annual screening of 96 chemicals (Pharmaceuticals, EDCs, Herbicides, Pesticides etc.) in the river and the processed water after GAC.
• The GAC consistently removes the Synthetic Organic Contaminants.
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Research on Emerging Contaminants
• Research in-house for emerging contaminants.
• In-house Rapid Small Scale Column Test (RSSCT) capability.
• In-house pilot-scale GAC columns.
• Participation in several research projects for removal of contaminants.
• Jar tests for PAC effectiveness.
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Research on Removal of Pharmaceuticals and EDCs by GAC
• Pilot study 10% breakthrough, EBCT 15 min
Source: S.Summers et al, WRF # 4235
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Additional Benefits of GAC at RMTP
• Removal of tastes and odors from the water.
• Provides an additional step of turbidity removal (water clarification).
• Improves the UV transmittance of the water and helps the downstream Ultraviolet Disinfection process.
• The water processed through the GAC requires less chlorine for disinfection.
• Improved control of the GAC performance during seasonal events and spills, due to the in-house GAC reactivation.
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Summary
• The GAC provides GCWW protection from spills and SOCs while providing reduction in Disinfection Byproducts.
• The drinking water is tested daily for several contaminants to ensure its safety and compliance with regulations.
• Ability to research and enhance the removal of emerging contaminants with a multi-barrier approach.
• GAC greatly improves our customers’ perception of our water quality.
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