REAL WORLD APPLICATIONS OF USING DYNAMIC SIMULATION SOFTWARE TO OPTIMIZE WATER TREATMENT PLANT PROCESS OPERATIONS

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1 REAL WORLD APPLICATIONS OF USING DYNAMIC SIMULATION SOFTWARE TO OPTIMIZE WATER TREATMENT PLANT PROCESS OPERATIONS (FRIT05) OCTOBER 30, 2015 Authors: Matt Ridens/CH2M, Jason Curl/CH2M

2 Overview Drivers for Use of Dynamic Simulation Models Project Examples and Applications of Models 30 mgd Greenfield Municipal Water Treatment Plant 770 mgd Existing Municipal Water Treatment Plant The Future of Predictive Models 2

3 Drivers for Use of Dynamic Simulation Models 3

4 Water Market Drivers for Optimization 4 Quantity & Quality Regulations Environmental Diversify New Facilities Conservation Adapt to water scarcity events and increasingly challenging water qualities Comply with current and provide flexibility for future drinking water regulatory requirements Minimize environmental impact by reducing energy, chemical usage and solids production Diversify supply portfolio to improve supply reliability and respond to water shortages Gain greater understanding of new facilities and refine design criteria during design Integrate new recycle streams for direct/indirect potable re-use

5 Big Data s Influences Are Increasing as We Become More Connected Household security and HVAC are connected to the web. Stores like Home Depot and Costco are using store data to understand shopping trends nationally, regionally, and locally. Water and wastewater systems have been collecting mountains of data for years, storing for documentation purposes. How can we make sense of this data? How can we use this data to inform decision-making? How can we improve treatment efficiency and effectiveness? Are we taking advantage of the technology and data on hand or are improvements a worthwhile investment? 5

6 Project Examples and Applications of Models 6

7 Applications for Dynamic Simulation Models Design Phase What treatment processes are required? Can facilities be optimized to reduce capital or O&M costs? Startup What are the initial set points for each process? What alarms should be in place to alert operators of potential impacts to water quality? NEW FACILITIES 7 Operations How can plant performance and design criteria be optimized based on existing data? What changes are needed to increase existing plant capacity? How can plant performance be predicted for future events or changes to my system? How can my system be optimized for energy consumption? EXISTING FACILITIES

8 Using Dynamic Simulation as a Predictive Model Run a number of What if? scenarios or analyses quickly in a no-risk environment. Customizable range of time allows for both short and long events (Seconds/Minutes or Weeks/Months) Evaluate many alternatives or scenarios for a defensible solution 8

9 Predictive Model Example CH2M s dynamic simulation model makes use of the following process predictive models Readily Calculated Mathematical Results Water chemistry in a calcium carbonate dominated system Calibrated Models with Understood Kinetics Ozone demand and decay Empirical Models Clarifier performance in an existing treatment facility Hybrids Total Trihalomethane formation in distribution systems We can only calibrate models and then predict performance if plenty of good data exists 9

10 Project #1 Overview 30 mgd greenfield Water Treatment Plant, located in West Project Drivers Design-Build-Operate project, including 15 years of operations WTP makes use of sand-ballasted clarification, ozone, biologically active carbon contactors and complete solids handling system Ability to treat highly fluctuating turbidity levels Multiple barrier approach Performance contract is more stringent than regulations 10

11 Project Goals Provide high-quality water at all times to customers Achieve sustainable operations Energy Chemicals Solids handling Operate plant proactively in terms of regulatory and contractual compliance 11

12 CLIENT PROJECT S O U R C E DSGN CHK DATE REV MANAGER F TSS AE TSS AE NaOH FeCl3 Poly TSS AE LOX O3 TSS AE Poly TSS AE NaOCl TSS AE TSS AE TSS Riv er Supply TSS AE F To Distribution Poly F Solids Hauling 12

13 Optimization of Treatment Process Design Ozone system sizing and type 13 Lower ozone dose Smaller ozone contactor Direct injection vs. side-stream Sand Ballasted Clarification (SBC) selection Replaced pre-sedimentation ponds and conventional flocculation/sedimentation Drying beds Replaced mechanical dewatering Optimized plant hydraulics to maximize gravity flow Evaluated pumping vs. earthwork Optimized intermediate PS

14 Optimization of Chemical Use Analysis of tradeoffs for chemical dose selection with varying water qualities Alkalinity augmentation (NaOH) Ozone dose Primary Disinfection: 0.5-log Giardia credit injection cell ozone residual of 0.3 mg/l Evaluate using entire contactor at lower ozone dose Taste and odor as needed (with hydrogen peroxide) Continuous water quality monitoring and feedback loops Sand ballasted clarification Predictive modeling of finished water quality 14

15 Operations Will Be Optimized by Performance Predictions with Live Data Parameter Compliance Period Target Value Unit Allowed Variance Current Value Note Turbidity - CFE Monthly 0.15 NTU Must comply for 95% of measurements 0.07 data direct from instrument Turbidity - Filter 1 Monthly 0.15 NTU Must comply for 95% of measurements 0.06 data direct from instrument Turbidity - Filter 1 15 Minutes 0.3 NTU 15 min following out of compliance value 0.06 data direct from instrument Turbidity - Filter 2 Monthly 0.15 NTU Must comply for 95% of measurements 0.08 data direct from instrument Turbidity - Filter 2 15 Minutes 0.3 NTU 15 min following out of compliance value 0.08 data direct from instrument Total Chlorine Residual Daily 1.1 mg/l +/- 0.2 mg/l 1 data direct from instrument TTHM Monthly 0.04 mg/l Maximum value 0.02 f(uv254, Cl, Temp) HAA5 Monthly 0.03 mg/l Maximum value 0.01 f(uv254, Cl, Temp) Total Manganese Monthly 0.02 mg/l Maximum value 0.01 f(rwmn, TSS removals) Total Iron Monthly sample 0.24 mg/l Maximum value 0.05 f(rwfe, TSS removals) Total Aluminum Monthly sample 0.16 mg/l Maximum value 0.06 f(rwal, TSS removals) Thiobencarb Monthly sample mg/l Maximum value f(rwthio, TSS removals) MIB and Geosmin Agency request 5 ng/l Maximum value 2, 2 f(rwmib, RWGeosmin, TSS removals) ph Daily 7.4 Units +/ data direct from instrument LSI Monthly 0.1 Units +/ f(ca, Alk, ph) Phosphate Weekly 0.3 mg/l +/- 0.2 mg/l 0.45 f(chem feed) 15

16 Project #2 Overview 770 mgd municipal WTP, located in the South Project Drivers Zebra mussels found in one water supply, resulting in adjustment to how raw water was blended and brought into WTP Droughts have stressed water supplies, reducing water quality (increasing taste and odor events) New blending of raw water sources New ozone addition with concern to bromate formation 16

17 Project Goals Evaluate impact of a sudden loss of one of the water supplies on the finished water quality. Identify what can be done to minimize water quality impacts. Investigate plant operation with the new water supply to comply with regulations while limiting operational costs. Evaluate performance of the new ozone system under the different raw water quality conditions associated with the new water supply, before ozone installation. 17

18 Model Background/Goals 18

19 Model Evaluations 1. Review water quality from each water source to understand variability in water quality for differing blend ratios of raw water entering WTP. 2. Model how changes in raw water quality (including different blend ratios) affect coagulation chemistry 3. Assess possible impact of raw water quality and chemical doses on TSS removal from the process. 4. Evaluate impact of the lower quality water supply at various blend ratios on bromate formation through the ozone system 5. Determine finished water quality and chemical doses entering the distribution system under varying raw water conditions 6. Determine the impact of raw water quality and various chemical dosages on water quality entering the distribution system, including finished water stability. 7. Evaluate impacts of raw water induced changes to coagulation and settling chemistry on solids production. 19

20 Blend Tank Scenario Results Impact of blend tank on settled/finished water TDS 75 min through Floc/Sed 10 min through Ozone 10 min through Filters 20

21 No Blend Tank Scenario Results Impact on TDS without blend tank 21

22 Blend Tank Analysis Conclusions Inclusion of the Blend Tank provides up to 15 minutes of buffer time for operations staff to react to changes in water quality prior to the Flocculation/Sedimentation treatment facilities. Inclusion of Blend Tank reduces overall magnitude (example: from ~900 mg/l to ~500 mg/l TDS) of water quality impacts witnessed in the influent Flocculation/Sedimentation facilities due to a sudden raw water quality change. Blend Tank has no impact on overall finished water quality due to large residence times at Flocculation/Sedimentation and Filtration facilities. 22

23 Chemical Dose for TOC Removal Scenario Input Data 23

24 Chemical Dose for TOC Removal Scenario Results Clarification Inlet TOC (mg/l) Ferric Sulfate Dose (mg/l) TOC Removal (%) Ferric Sulfate Usage (gal/wk) Chemical Deliveries per Week , , , , , , ,

25 Project Conclusions At historic averages for TOC values, 10 mg/l of ferric sulfate (as ferric sulfate) would provide 35% TOC removal. If higher TOC values are seen (TOC of 6 mg/l) 40% TOC removal would require a dose of approximately 20 mg/l. Plant operational decision-making will benefit from a more robust dataset With more high-quality data, we can correlate raw water characteristics with process response (e.g., TSS and TOC removal). When we understand process response more clearly, we can aid operational response (e.g., chemical dosages, raw water source selection). Operations staff can gain more confidence in operating the new ozone system and responding to raw water quality events by testing what-if scenarios. 25

26 The Future of Predictive Models and Dynamic Simulation in the Water Industry 26

27 Wrap Up and Conclusions As a whole, our industry is moving to optimize systems from a complete sustainability perspective. Economic Societal Environmental Using sound data in an intelligent way provides a means to move toward more sustainable designs and operations of our water treatment facilities and distribution systems. 27

28 Wrap Up and Conclusions How will we handle the need to share data across platforms so that we can make more informed decisions while still ensuring security of our infrastructure? These data analysis and modeling methods are applicable to all types (simple to complex) and sizes (small to large) of systems. Dynamic simulations provide a means to investigate many what-if scenarios in a safe environment while considering variable raw water qualities over time, different responses to events, new infrastructure, and various operational responses 28

29 Thank you! Questions? 29

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