City of Flint, MI Water Quality Report Technical Advisory Committee - - PowerPoint PPT Presentation

City of Flint, MI Water Quality Report

Technical Advisory Committee

Water Plant

Distribution

Communication

Solution Involves Coordination of 3 Activities

March 4, 2015 Technical Advisory Committee 2

Water plant improvements

Optimize chemical dosages Consider different chemicals Install granulated activated carbon Complete plant upgrades Implement best mgt practices

Distribution system improvements

Fix broken valves Ask for customer feedback Reduce tank storage Target line flushing Run a hydraulic model

Better communication with customers

Engage advisory committees More accessible utility Make it easy to access information Better customer communication

Optimize Plant Processes

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TOC Removal Efficiency Optimizing Current Plant

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3.3% 34.4% 60.0% 59.6% 57.7% 59.1% R² = 1.00

0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50 8.00 1 2 3 4 5 6 7 TOC, mg/L River Ozone Effluent Clarifier Effluent Softener Effluent Filter Influent Filter Effluent Plant Tap

Removal with GAC

Potassium Permanganate Dosing Graph

5

R² = 0.9753

0.195 0.200 0.205 0.210 0.215 0.220 0.225 0.230 0.235 0.240 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 UV Absorbance, cm-1 KMnO4 Dosage, mg/L Customary

Pink coloration

JAR TEST BENCH SHEET

1 FACILITY NAME Flint, Michigan DATE February 16, 2015 CHEMICAL DATA ALUM FeCl3 Fe2(SO4)3 POLYMER LIME KMnO4 Specific gravity 1.16 Percent dry chemical 20 Stock volume, mL 100 Chemical added, mL or grams 0.9 Stock concentration, mg/L 2,000 Solution volume, mL Stock solution added, mL Solution concentration, mg/L TEST CONDITIO NS STIRRER RPM DURATION Simulated Conditions Rapid Mixing 300 seconds G - sec-1 Flocculation 30 15 minutes G - Settling minutes Coag. 0.3 gpmft2 Filtered distilled water time seconds Soft. 1.16 gpm/ft2 RAW WATER CHARACTERISTICS Temperature °C pH Alkalinity Hardness Turbidity Color TOC DOC POC 7.05 Filterability Index Calcium Magnesiu m Iron Manganes e THMFP UV254 0.198 JAR NUMBER 1 2 3 4 5 6 Raw water volume, mL 2,000 2,000 2,000 2,000 2,000 2,000 Alum solution added, mL Alum dosage, mg/L Ferric solution added, mL Ferric dosage, mg/L Polymer solution added, mL Polymer dosage, mg/L KMnO4 solution added, mL 0.5 1.5 2.5 3.5 4.5 5.5 KMnO4 dosage, mg/L 0.5 1.5 2.5 3.5 4.5 5.5 Lime solution added, mL Lime dosage, mg/L FLOC FORMATION OBSERVATIONS 5 minutes 10 minutes 15 minutes 20 minutes 25 minutes SETTLING CHARACTERISTICS OBSERVATIONS 1 minute 2 minutes 3 minutes 4 minutes 6 minutes SETTLED WATER RESULTS Turbidity, NTU Water pH Alkalinity, mg/L Hardness, mg/L TOC, mg/L UV254, cm-1 0.215 0.222 0.228 0.230 0.232 0.237 Filtered water time Filterability Index NOTES: Veolia Water North America

March 4, 2015 Technical Advisory Committee

Bromate Dosing Graph

6

R² = 0.9761

2 4 6 8 10 12 14 16 18 20 22 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 Bromate , ug/L Ozone Dosage, mg/L

Bromate limit, 10 ug/L

Maximum ozone dosage appears to be 5 mg/L to minimize bromate formation

Marc 4, 2015 Technical Advisory Committee

Dosage of Ferric Chloride

7

R² = 1.00

2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 10 20 30 40 50 60 70 80 90 100 TOC, mg/L FeCl3 Dosage, mg/L

Marc 4, 2015 Technical Advisory Committee

Lime Dosage Graph

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20 40 60 80 100 120 140 160 180 200 220 240 260 280 140 160 180 200 220 240 260 280 300 Concentration, mg/L as CaCO3 Lime Dosage, mg/L Calcium Magnesium Alkalinity Hardness Optimal Point Current Operating Point

Activities to Help Operators Maintain Good Water Quality Process Control Management Plan Lab QA/QC Program Computerized Maintenance Management System Asset Management System Training and Certification Program Vulnerability Plan

Implement Best Management Practices

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Water Age Map

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Speed up flow of water from plant to homes – 2 weeks plant to house

Find closed valves & open them Replace broken valves Update hydraulic model Reduce system storage

Track customer complaints

Test customer water Spot flush hydrants to clean areas of stagnant water in the system

Troublesome TTHM Test Sites Conceptual Map

Develop a proactive customer communication plan Create advisory committees to help direct efforts and improve flow

• f information

Add additional communication personnel for the utility Develop a pro active communication program Establish a single point of contact to manage all water quality complaints Provide additional customer service training and tools to staff Expand neighborhood and community outreach Change monthly billing statements from card to envelope with information

Make It Easy to Access Information and People

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Questions?