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I&C PROJECT MANAGER WATER DIVISION JULIE INMAN

INSTRUMENTATION & CONTROL FOR WTP OPTIMIZATION

AGENDA

Drivers I&C Definitions and Components Areas of Opportunity / Examples

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DRIVERS

OPERATIONS & MAINTENANCE Improve Predictability

Reduce Leakage and Waste Optimize Plant Operation and

Control

CUSTOMERS W/WW Rates

Demand & Quality Goals Be a Leader in Environmental

Stewardship

REGULATORY 2012 Stage 2 DBP Carbon Emissions

Possible Future Limitations on Energy Use

FINANCIAL Economic Downturn

Energy Prices Predict, Reduce, & Control Operating Costs

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I&C Systems are tools you can use to….

Optimize Operations Maximize Benefits of Existing Assets

THE NEW MANTRA….DO MORE WITH LESS

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I&C DEFINITIONS AND COMPONENTS

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• PCS – Process/Plant Control System

• DCS – Distributed Control System • SCADA – Supervisory Control and Data Acquisition

• PLC – Programmable Control System • RTU – Remote Terminal Unit

• DCU – Distributed Control Unit

• FCU – Field Control Unit • I/O – Inputs/Outputs • HMI – Human Machine Interface

ALPHABET SOUP

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• Instrumentation / Final Control Elements

• Field Controller and I/O (PLC, RTU, FCU) • Communication Systems

• Networks • Host / Servers

• Client / Workstations

• Historical Data Collection • Reporting

INSTRUMENTATION & CONTROL SYSTEM COMPONENTS

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TYPICAL CONTROL SYSTEM February 2, 2012

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I-2

Pump

PLCP-4

Wireless Communications

RTU

PLC Network

Firewall

Historian Server 1 Server 2

SCADA Network

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In-Plant Wireless Comms

Intranet / Internet

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Secure Remote Monitoring

AREAS OF OPPORTUNITY AND EXAMPLES

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I&C can be leveraged to optimize energy and chemical use and increase O&M efficiency

• Energy Savings

• Chemical Savings • Water Quality Goals

• O&M Efficiency

AREAS OF OPPORTUNITY

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Typical WTP O&M Costs

FILTER OPTIMIZATION WATER QUALITY CHEMICAL USAGE

PRESENTER NAME OPTIONAL TITLE COMPANY DIVISION

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Information Should be Meaningful and Easy to Access

• Filter Run Time

• Filter Run Volume • Net Water Production

• Flow

• Head loss • Turbidity • Particle counts

FILTER OPTIMIZATION

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OPERATOR DISPLAYS – TREND HISTORICAL DATA

Regulatory Reporting and Optimization

• Tungsten or LED light source • 0.1 to 100 NTU • Regulatory Reporting • Optimization up to 0.1 NTU

• Laser Diode light source • 0.005 to 5.0 NTU • Optimize > 0.1 NTU

• Raw Water, Settled Water, Individual Filter Effluent, Combined Filter Effluent

• Filter-to-Waste based on Turbidity

TURBIDITY MEASUREMENT

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Historical Data Collection, Trending and Reporting

• Particle size and quantity

• Stand alone computer software • SCADA Integration

• Open communication protocols for integration with SCADA

• Multiple Analog Outputs

• Interpreting data important

• Raw Water, Settled Water, Individual Filter, Combined Filter, Clearwell

PARTICLE COUNTERS

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• Detect particle breakthrough

• Filter Backwash Selection • Filter-to-Waste Control

• Coagulant Optimization • Detects GAC fines, coal dust

• Floc Particle Characterization

• Raw Water Variations • Clearwell Problems

PARTICLE COUNTER APPLICATIONS AND BENEFITS

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• Ensure stable, consistent flow

• Regular maintenance required • Raw and settled water installations require more

maintenance • Sensors upstream of chemical addition

• Sample tap on side of pipe

• Calibration

PARTICLE COUNTER CONSIDERATIONS

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Optional section heading

• Measures colloidal and coagulant surface charge

• Display and Trend

• Automated Coagulant Feed Control • Raw Water Flow • pH • Streaming Current

STREAMING CURRENT DETECTORS (SCD)

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Reduce chemical use 12% under stable conditions and 23% under varying raw water quality (Dentel and Kingery 1988)

• Greater benefits for highly variable raw water

• Optimized coagulant feed • Reduced chemical costs

• Longer filter runs • More consistent water quality

• Early detection of equipment malfunction

BENEFITS OF STREAMING CURRENT DETECTORS

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• Not suitable for some source waters

• Sample Point/Sample Time • Scheduled PM, varies depending on water quality

• Evaluation period • Periodic comparison to Jar tests

STREAMING CURRENT DETECTOR CONSIDERATIONS

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• Total Organic Carbon

• UV254

• pH

• Sludge Density • Power Monitoring

ADDITIONAL ON-LINE MONITORING

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ENERGY EFFICIENCY

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~80% of energy use is for Pumping

TYPICAL ENERGY USE FOR WTP

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0.0%

10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

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• Operate Pumps Close to Best Efficiency

• Load Shift Pumping • Minimize Demand Charges

STRATEGIES FOR PUMPING OPTIMIZATION

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• Display of real-time energy use and efficiency information on Operator Screens

• Smart Meter connected to SCADA

• Wire-to-water Efficiency Calculator for Pumps

MONITOR FINISHED WATER PUMP STATION EFFICIENCY

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Energy Cost Savings = 5% to 30%

• Analyze Pump and System Curves

• Determine Optimum Pump Combinations for Varying Demand

• Program Automatically Selects Most Efficient Combination

AUTOMATE SELECTION OF MOST EFFICIENT PUMP COMBINATION

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Demand Charges = Up to 20% of Electric Bill

ELECTRIC RATES

• Energy Use – kWh • Time-of-Use vs. Flat

• Demand Charges - kW • Instantaneous Power • Highest 15 min Avg kW

SHIFT PUMPING TO LOWER COST TIME PERIOD – MINIMIZE DEMAND CHARGES

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Source: Salt River Project www.srpnet.com

EXAMPLE – CITY OF PEORIA OPTIMIZATION STUDY

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Potential Annual Savings Sonoran Booster - $4,128 or 33.4% Jomax Boosters - $10,859 or 16.8%

• Low Cost Immediate Payback Measures

• PLC Programming for Time-of-use Pumping

• Analyzed Historical Data

• Modeled Optimized Pumping

• I&C Systems can be leveraged to…. • Optimize Operations • Maximize Benefit from Existing Assets

• Control System Displays, Trends and Reports • Meaningful • Easy to Access

• Monitor Multiple Parameters • Monitor Energy Use and Incorporate Energy

Efficiency Strategies

CONCLUSION

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THANK YOU Q&A