Water Treatment Plant Optimization- Today s Balancing Act of Costs. Regulations, and Customer Confidence

Transcription

1 Water Treatment Plant Optimization- Today s Balancing Act of Costs. Regulations, and Customer Confidence The 3 R s of Operation-Recognize, Respond, React R. Michael Kennedy Water Treatment Superintendent City of Mesa Brown Road Water Treatment Facility AZ Water Association Phoenix, AZ January 25, 2011

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3 Presentation Outline Water Treatment Plant Optimization I. Objectives Overall II. Water Resources-Source Water Quality III. Treatment Optimization-the Balancing Act IV. Costs of Operations- COP-Challenges Of Operation V. The Future

4 I. OBJECTIVES OVER-ALL WHAT ITS ALL ABOUT

5 WHAT DO WE DO? 1) Drinking water Quality Providers <Treatment/Production> 2) Drinking water Quality Protectors <Quality/Compliance> STRUCTURE is the FOUNDATION of any organization -Operators, Maintenance Staff, Process Controls, are the Structure -The Plant is the ultimate operational/production tool, the Foundation

6 The Balancing ACT

7 OBJECTIVES OF OPERATION City of Mesa Water Resources Water Supply/Source Redundancy-ability to deliver water supplies in distribution system under a variety of conditions. Water Treatment Reliability-components of the WTP can treat and deliver water under varying treatment, maintenance, and operational conditions. Water Sys. Operational Requirementsconditions such that water can be delivered reliably under fire flow, high demand, or other extreme or unusual operating condition. Cost Effectiveness and Optimization Water System Compliance & Aesthetics Costs-Lexus vs. Kia??? - Commitment and Willing to Pay

8 Water Treatment Plant Modus Operandi NOP- normal operation: operations status quo by meeting WQ/Regulatory Guidelines for treatment. WOP- wishful thinking operation: Lexus quality operations and water quality. ROP- response operations: changes in source water quality, plant malfunctions, oops and awe-sh, etc. FROP- frugal operation: The bean counters, modeling Treatment Operations-the MikaScope Financial Operations-the Setha-Scope

9 Approaches to Controlling DBP s in Preparation for Stage 2 DBP Rule Compliance Remove the DBP precursors at the treatment plant Reduce the amount of disinfectant and/or change the point of application Reduction of amount of chlorine added by switching from chlorine to alternative primary and/or secondary disinfectants Distribution System localized treatments and changes in system operation

10 INNOVATION A new way of doing something Refers to incremental and emergent or the radical and revolutionary changes in thinking, products, processes, services, or organizational structure. Synonymous with the output of a process or service. The main goal is Positive Change

11 II. Water Resources-Source Water Quality Source Water Challenges/Changing Water Quality

12 CAP Source Water Quality/Treatment Triggers Source Water Influences Alamo Lake Bill Williams River Lake Havasu Lake Pleasant CAP Maintenance Activities Algae and Aquatic Plants Unknowns/Storm-water/Other Discharge, cubic feet per second

13 CAP Source Water Quality/Treatment Triggers Mesa CAP Canal Turnout Visual Observations

14 CAP Source Water Quality/Treatment Triggers Control Room SCADA Process Lab Analysis

15 CAP Source Water Quality/Treatment Triggers Temperature ph/h-ion Conc. Specific Conductance Fluoride TOC UV254 Visual Observations Hydraulics-Flow Color Tot. Alkalinity Algae Counts Communication

16 CAP Source Water Quality/Treatment Triggers Total Organic Carbon TOC UV254 Organics Monitor

17 CAP Source Water Quality/Treatment Triggers Jar Testing Remote Instrumentation

18 CAP Source Water Quality/Treatment Triggers Chlorine Dioxide Monitoring Fluoride Monitoring

19 CAP Source Water Quality/Treatment Triggers Raw Water Turbidity Raw Water ph

20 CAP Source Water Quality/Treatment Triggers NOW INITIATE/PRACTICE THE 3R s RECOGNIZE RESPOND REACT

21 III. Treatment Optimization-the Balancing Act What Is Optimization? To attain the most efficient and effective use of a drinking water treatment plant in regards to some guiding principles: Achievement of consistently high quality finished water on a continuous basis Focus on overall plant performance, instead of focusing too much on a individual process Maximum efficiency in meeting production and storage demands Optimizing while at the same time meeting water quality, aesthetic, and regulatory compliance

22 Water Treatment Goals and Objectives GOALS are the general guidelines of where we want to be, whether regulatory, quality, or aesthetic. Common amongst WTP s. OBJECTIVES define the strategies or implementation steps to attain the identified goals. Each WTP may have different objectives based on costs, treatment strategy, SOP s, etc. Objectives are specific measures we use to determine whether or not we were successful in achieving the Goals.

23 Water Treatment Goals Regulatory We all share the same Regulatory Goals: -Chlorine MCL = 4.0 mg/l Stage 2 D/DBP Rule -Chlorine Dioxide MCL = 0.8 mg/l -Chlorite MCL = 1.0 mg/l -Bromate MCL = 10 ug/l -DBP Precursor Removal (TOC or SUVA) (Treatment Plant) A treatment technique which may require 15-40% removal based on source water alkalinity and TOC. TTHM/HAA = 80/60 ug/l LRAA (Distribution System)

24 Water Treatment Goals Regulatory LT1/2 ESWTR -Turbidity: CFE <0.3 NTU in 95% samples IFE <1.0 NTU at all times -Cryptosporidium: Required monitoring and associated treatment. Cryptosporidium Removal min. 2-log Giardia Removal min. 3-log Viruses Removal min. 4-log

25 Water Treatment Goals Water Quality/Aesthetic Local/In-Plant established WQ goals USEPA AWOP Program Partnership for Safe Water Others

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27 Specific Performance Goals adopted at Mesa BRWTP

28 IV. Costs of Operations The Balancing Act Today s Challenge of the Day: Less drying bed space availability due to 1) climatic conditions, 2) increased flow/production rates, 3) source water quality conditions-increased chemical use Meet greater/minimal water quality goals by increased chemical use -OR- Reserve Drying Bed Space through sludge management/reduction with less chemicals Ultimate Goal: Regulatory/Compliance CHALLENGE - Remove turbidity in Coag/Floc/Sed. process with increased chemical use, or by the filtration process, thus resulting in reduced filter run times and increased use of wash water.

29 The Challenge Treatment Optimization The Balancing Act Coagulation/Flocculation/Sedimentation (>Chemical Use, > sludge production, > costs) Filtration (Turbidity Removal with <filter run times, >wash water)

30 The Challenge Sludge Management High Rate/Under-drain Drying Beds Solar Drying Beds

31 Water Treatment/Water Supply COP-challenges of operation Operational Costs- Fixed vs. Variable Chemicals (3yr Increases in Costs ) -Alum 29.5% -Chlorine 19.5% -Polymer(coag.) 0% -HFS 245% -PAC 50% -Sod. Chlorite 448% Electrical: Steady Increases 3.65% upcoming Parts and Supplies Staff turnover, recruiting, salaries

32 Brown Road WTP Chemical Cost Comparisons CHEMICAL $$ FLOW, MGD Treatment Chemicals $160, $140, CAP WQ Event Flow Increases & CAP WQ Event $120, $100, Polymer-Coag Polymer-Filter Fluoride $80, Chlorine Alum $60, $40, WTP S/D Sod.Chlorite PAC Flows(MGD) $20, $0.00 0

33 KWH Brown Rd. WTP Monthly Electrical Usage Treatment Operations Distribution Pumping Operations

34 V. The Future Meeting Compliance at the WTP Treatment Optimization Primary/Secondary Oxidants/Disinfectants Upgrades/Design Enhancements Performance based Operations and Water Quality objectives/goals **Reduce DBP Precursors at the WTP

35 Meeting Compliance Within the Distribution System Factors Affecting TTHM Production Chlorine Residual Temperature DBP Precursors (TOC/Organics) Water Age Hydraulics System Operations Localized Treatment Techniques

36 Keys to Management and Operational Success Leadership Strategic Business Planning Organizational Approaches Measurement Continual Improvement Management Framework Trained and Competent Staffing POSITIVITY

37 PRAY What its all about P erspective R egulations A nd Y ou

38 Options for Controlling Disinfection By- Product (DBP) Formation What are We Doing? Treatment Plant Optimization Program (includes DBP minimization enhancements, increased monitoring and instrumentation, training. Design considerations of new water treatment facilities Total Organic Carbon (TOC) goal of <2.0mg/l from WTPs. Chlorine management, control, monitoring enhancements, reduce average distribution Cl2 residual from 1.00 mg/l to 0.80mg/l Consideration of utilization of alternative primary disinfectant like ozone at WTPs to minimize DBP precursors and Chlorine use. Consider post-formation removal of DBPs (localized treatments at storage reservoirs/tanks with extended water age). Improved distribution system operation and management Hydraulics and Water Age

39 That s All Y all Any Questions