Dipankar Sen, PhD, PE Adil Godrej, PhD, PE Adnan Lodhi Bob Angelotti, PE

Transcription

1 Developing and Implementing a System to Manage Operational Risk and Increase Reliability of Water Supply with Recycled Water Added to Reservoir Systems Dipankar Sen, PhD, PE Adil Godrej, PhD, PE Adnan Lodhi Bob Angelotti, PE Presented at the Third IWA Lakes and Reservoir Management Symposium Mountain Lake, Pembroke, Virginia August 7, 2015 Occoquan Watershed Laboratory Upper Occoquan Service Authority

2 Regional Systems for Water Supply and Reservoir Augmentation Occoquan System, VA Located outside Washington DC Plant, reservoir, water treatment 100 percent reuse Santa Rosa Regional System, CA Located North of San Francisco Bay Requires 100% Reuse as new objective, based on 1000 year Drought in California

3 35+ years of Advanced Treatment and Recycling in the Washington Metro Area Helps provide a more reliable water supply each year and during droughts Drinking Water Treatment UOSA Plant Wastewater Treatment & Water Purification

4 Additional Potable Water Contributions from Lake Manassas & Potomac River Sources

5 Occoquan Reservoir Today Photo: Courtesy Roger Snyder

6 Reclaimed Water Increases Yield 50% in 2015, Doubles it in 2025 Occoquan Reservoir Safe Yield in mgd (Million gallons per day) UOSA Flow Streamflow Total Safe Yield Future Buildout 50 percent increase in reservoir yield today For mental math 1 MGD = 1000 acre feet per year = 3785 m 3 /day

7 Key Finding: Requires more Sophisticated Management practices Occoquan Lab, Virginia Tech 7

8 Lessons Learned Conventional Plant affects Advanced Plant and vice versa Upgrades, expansion, operations, maintenance and asset management systems have to take this into account! 8

9 Setup 2013 IViewOpsPlant Simulation to Replicate Assets and Hydraulics that affect Processes

10 Santa Rosa, CA Plant

11 Multiple Types of Reuse Wineries and Farms Objective Eliminate this And Maximize Reuse Geothermal Power Generation Challenge Climate Change is Extending Dry Weather Period and Compressing Rainfall into a more intensive Wet Weather Period In 1000 year Drought but December 2014 was the wettest December on record

12 Manage

13 Santa Rosa IViewOps Simulation Minimum of Three Views for Three Objectives Optimize Plant, Biosolids, Regional Reuse Scenarios: Current Steady State Current Dyn State Drought Steady State Drought Dyn State Wet Weather Steady St Wet Weather Dyn Sim Evaluate (Future) State

14 Delta Pond Geyser Fields High Pressure Line Need to Simulate Fairly Complex Reuse System To Optimize its Expansion and Management Low Pressure Line Meadow Lane Ponds Bear Canyon Reservoir EPS From Plant Llanos PS

15 System Design, Operations and Management get more sophisticated with Reuse 1. Design 1. Configuration and Sizing Isolation systems, recycles, reject water 2. Plant Management Systems 1. Operations Procedures and Advisory Systems 2. Maintenance Procedures and Advisory Systems 3. Risk Management Systems 3. Regional Management Systems 1. Water and Biosolids Reuse 2. Troubleshooting, Optimization, Management 1. Support decision making such as when weekly discharge is different from anticipated 2. Unplanned outages and constraints at plant or downstream 3. Changes to weather patterns create constraints 1. Extreme drought, change to rainfall distribution Need to Build Additional Competencies as the Time and Space to Accommodate Fluctuations in Treated Wastewater Quality and Drinking Water Supply is Reduced 15

16 Plant Simulation in 2015 in IViewOps3 Uses Scenarios, Views, Sub Views

17 West Train View, Subview 1 (WT 1) in CDS Current Dynamic Simulation Scenario

18 Intelligent Real Time Risk and Reuse Management through IViewOps On this day, optimizer tells them that they can improve operations on the West Side by Changing Nitrate Recycle Rate 18

19 Intelligent Real Time Risk and Reuse Management through IViewOps Daily use of Plant Optimizer in Winter Effluent quality will improve from 7.7 to 6.4 mg/l Nitrate N if the change is made to Nitrate Recycle Rate 19

20 Computing & Managing Standby Capacity on Sec Clarifiers Daily For Maintenance Planning and Response to Wet Weather Flows

21 We Started with Plant Based Simulation System SCADA information Computer With IViewOps Transmit Data for use with other software such for Asset Management and Maintenance Management Additional Machines Capable of running IViewOps For AM Lab Inspection information information Asset capacity

22 Migrating to a Regional System that ties into Managing Plant with Reservoir SCADA information Computer With IViewOps Transmit Data for use with other software such for Asset Management and Maintenance Management Additional Machines Capable of running IViewOps For AM Lab Inspection information information Asset capacity Reservoir capacity and water demand AM = Asset Management Biosolids capacity and application Stream Model; Reservoir Model; Water Storage Model; Biosolids Storage Model

23 Enhanced Plant and Regional System for Faster Simulation for Daily Troubleshooting; Weekly, Monthly Optimization of Management Strategies

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26 URUNME (You Run Me)

27 Occoquan Reservoir Safe Yield in mgd (Million gallons per day) Requires more Sophisticated Management practices UOSA Flow Streamflow Total Safe Yield Future Buildout 27

28 Conclusions Impact of Recycled Water on Reuse Systems is increasing with growth of population and climate change This is because of increase in percentage of total supply measured annually, seasonally, monthly The time to respond, develop new operations strategy and reoptimize is decreasing Plants will be subject to perturbations due to system outage, sensor problems, etc. To optimize investment and avoid large numbers of stranded assets (or assets used only occasionally once every 5 years), models and systems have to be designed and operated more efficiently We are investing in several efforts to enable this Savings can easily exceed 100 Million dollars for 100,000 m 3 /d (25 MGD) and larger systems

29 Thanks for listening! Questions? Dipankar Sen Adil Godrej Adnan Lodhi Bob Angelotti Occoquan Watershed Laboratory Upper Occoquan Service Authority