WRF Webcast Integrated Treatment Process Management · PDF filecollaboratively to develop...
Transcript of WRF Webcast Integrated Treatment Process Management · PDF filecollaboratively to develop...
© 2017 Water Research Foundation. ALL RIGHTS RESERVED.© 2017 Water Research Foundation. ALL RIGHTS RESERVED. No part of this presentation may be copied, reproduced, or otherwise utilized without permission.
WRF Webcast
Integrated Treatment Process Management for Drinking Water and Wastewater Treatment
Operations
June 1, 2017
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Housekeeping Items
• Download the slides • Q&A• Post-event Survey• Webcast On-Demand
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Today’s Schedule• WRF’s One Water Mission• What Is ITPM?• What Might ITPM Look Like?• Opinions and Experiences with ITPM• Research Development Workshop and
Outcomes• Conclusions • Q&A
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Moderator
Leanne Miller, P.E. Water Research Foundation
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WRF’s One Water Strategy
One Water Research Agenda will fund
research to support the drinking water,
wastewater, and stormwater industries.
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Erin Mackey, Ph.D., P.E.Principal Investigator
Brown and Caldwell
Wendy Broley, P.E.Co-Principal Investigator
Brown and Caldwell
Peter BongWater/Wastewater
SuperintendentCentennial Water and
Sanitation District
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Erin Mackey Ph.D., P.E. Brown and Caldwell
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What Is ITPM?1
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Integrated Treatment Process Management (ITPM)
is a holistic approach to water management through
which water management agencies work
collaboratively to develop practices that achieve
treatment objectives in a way that minimizes
overall cost and maximizes environmental, water
body, and watershed quality benefits, while
protecting public health.
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ITPM Takes One Water to the Next Level
01What is ITPM?
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• Goals and efficiencies of looking at water and wastewater systems operation together— Energy savings— Fewer waste-processing systems— Better management of variable flows— Cost savings and/or improved
operations by optimizing chemical selection and dosing
Benefits of Integrating Water and Wastewater Treatment Processes
©hydxl/Shutterstock
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01What Is ITPM?
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“Discussions are underway between our water and wastewater utility on how to share assets and infrastructure so that we can become more efficient and cost-effective to our customer base.”
“[Our utility] sends our WTP residuals…to the WWTP. It is dewatered together, and is land applied.”
Over 50% of Respondents Report Practice of ITPM
Opinions and Experiences with ITPM
56%44%
Practices ITPM
Does not practice ITPM
03
Over 50% of Respondents Plan to Implement More ITPM in the Future
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Investigation of ITPM Practices2
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Opportunities to Integrate Treatment Processes
What Might ITPM Look Like?
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2
1Integrating the processing of water treatment plant residuals and wastewater sludge
Selecting chemical treatment practices that optimize water and wastewater operations and costs
Water treatment plant RO concentrate and filter backwash management to minimize impacts on wastewater treatment processes
Although there are examples of ITPM occurring at select utilities across the country,
ITPM research is still an emerging field, most notably showing potential benefits in
three areas.
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02
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Co-processing May Enhance Treatment Efficiency and Reduce Processing Costs
~15% of U.S. municipalities co-manage water and wastewater solids including:• San Francisco
• Chicago
• Indianapolis
• Milwaukee
• Philadelphia
• Nashville
• Metropolitan Water Districtof Southern California
• Betasso WTP
• Centennial Water andSanitation District
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02What Might ITPM Look Like?
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• Potential impacts of co-processing — Iron toxicity in activated sludge
— Precipitation of phosphorus
— Prevention of oxygen transfer in biofilms
• Case study: 75th Street WWTP in Boulder, CO— Issues led to setting a maximum
acceptable iron concentration in WTR
Effects of Co-processing on Biological Activity
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02What Might ITPM Look Like?
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• Over 50% expressed interest in pursuing co-processing
• 89% of respondents noted co-processing needs more research including:— Regulatory implications— Implementation barriers
Most Respondents Identified Co-processing of WTP Residuals and WWTP Sludge as an
Area of Interest
03
Opinions and Experiences with ITPM
©RotaryKilnChina
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Effects of Co-land Application of WTR and Biosolids
• Co-land application as an alternative to co-processing
• Limits on heavy metals and nutrients content
• Improved phosphorous absorption of the soil
• Reduction in phosphorous in runoff and leachate
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02What Might ITPM Look Like?
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• Anticorrosion and scale-forming chemical additions
• Chemical additions at desalination facilities
• Alkalinity and pH-adjusting chemical additions
• Water treatment coagulant additions
Chemical Treatment Optimization
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02What Might ITPM Look Like?
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• BMPs vary by water quality and location characteristics
• Sewer disposal options depend on downstream capacity
WTP Concentrate and Filter Backwash Management
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02What Might ITPM Look Like?
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Peter Bong Centennial Water and Sanitation District
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Case Study // Centennial Water and Sanitation District
Source: Google Earth 2016
03Opinions and Experiences with ITPM
Overview of CWSD Community of 100k people
near Denver, CO Provide Water and
Wastewater service 30 MGD Surface Water Plant 9 MGD Ground Water Plants 8.5 MGD Wastewater Plant
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Case Study // Centennial Water and Sanitation District
03Opinions and Experiences with ITPM
WTP residuals sent to the WWTP• Ferric Sulfate and PAC Sludge• Sent by gravity via SS• Becomes part of the biosolids
that are land applied • 20 Wet Tons of Biosolids per day
Winter• 30 Wet Tons of Biosolids per day
Summer
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Case Study // Centennial Water and Sanitation District
03Opinions and Experiences with ITPM
Positives of co-processing• One location for dewatering and hauling• Lower disposal costs• Improved primary clarifier removal efficiency 69% TSS removal without residuals 31% BOD removal without residuals 83% TSS removal with residuals 47% BOD removal with residuals
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Case Study // Centennial Water and Sanitation District
03Opinions and Experiences with ITPM
Positives of co-processing (continued)• Reduced BOD load results in less air demand in
the activated sludge basins• Improved copper removal• Improved primary sludge density• Improved odor at the Primary Clarifiers
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Case Study // Centennial Water and Sanitation District
03Opinions and Experiences with ITPM
Positives of co-processing (continued)• Increased methane production due to BOD/carbon
capture and diversion to digesters. 10 to 20 % increase, still monitoring
• Foaming in anaerobic digester reduction Initial testing shows a increase in pH when the residuals are
present. Possibly due to PAC limiting the volatile acid formation.
• Struvite formation in the digesters/centrate is minimized
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Case Study // Centennial Water and Sanitation District
03Opinions and Experiences with ITPM
Negatives of co-processing• Supplemental carbon may be needed in the summer for
biological nutrient removal• Variable BOD removal. May need to change to Chemical
Enhanced Primary Clarification• Iron can be a large percentage of the TSS leaving the
facility, so effluent TSS must be kept low. • TENORM may become an issue in the future• Selenium levels increased when WTP are present
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Case Study // Centennial Water and Sanitation District
03Opinions and Experiences with ITPM
Next Steps:• Continue to monitor
digester foaming to determine control mechanism
• Continue to monitor selenium levels
• Construct CEPCchemical tanks
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Wendy Broley, P.E. Brown and Caldwell
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Research Development Workshop and Outcomes4
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• Explored what’s “out there” in ITPM research and utility practices
• Held a utility workshop to develop concepts for how ITPM research could move forward
WRF Project 4677 Developed a Research Roadmap for ITPM
Research Development Workshop and Outcomes
6
04
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• Water professionals from across the country
• Global research themes identified
• Developed draft list of project ideas for the research themes
A Collaborative Workshop Identified ITPM Research Priorities
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04
Research Development Workshop and Outcomes
• Project problem statements crafted and refined
• Ranked top research priorities
• Determined top five recommended project ideas and objectives for further consideration by the RAC
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Four ITPM Research Areas Were Identified
Co-processing of water treatment residuals and wastewater sludge
Chemical optimization between WTPs and WWTPs
Beneficial combined solids reclamation (BCSR)
Concentrate and backwash solids management
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04
Research Development Workshop and Outcomes
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2
1
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Identified Research Concepts
1. Costs and Opportunities Associated with Co-processing
2. Impacts of Co-processing on Wastewater Processes
3. Co-processing Guidance Document
4. Fate-and-transport evaluation of key constituents resulting from the introduction of WTRs at WWTPs
5. Beneficial synergies of co-locating water and wastewater treatment/water reclamation facilities
6. Impacts of conveying WTRs to collection systems
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Area 1
Co-processing of WTR and wastewater sludge
04
Research Development Workshop and Outcomes
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Identified Research Concepts
321
1. Inventory of Chemicals Used in WTPs and Their Potential Impacts on WWTPs
2. Tools for Technical and Economic Analysis of System-Wide Chemical Treatment Optimization
3. Inventory of Chemicals Used in WWTPs and AWPFs and Their Potential Impacts on Water Treatment
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04
Research Development Workshop and Outcomes
Area 2
Chemical Optimization Between WTPs and WWTPs
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Identified Research Concepts
321
1. Potential beneficial uses and markets for BCSR
2. P- and nitrogen (N) fixation during land application for biosolids alone, co-processed solids, and comingled solids
3. Impacts on soil microbial composition and activity from co-land application of biosolids alone, co-processed solids, and comingled solids
4. Impacts on greenhouse gases from beneficial use of biosolids alone, co-processed solids, and comingled solids
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04
Research Development Workshop and Outcomes
Area 3
Beneficial Combined Solids Reclamation
©Ehrman Photographic/Shutterstock
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Identified Research Concepts
2
1 1. Decision tool for managing WTP waste streams
2. Impact of periodic release of concentrate and backwash from WTPs on wastewater processes, hydraulic loads, and filter-to-waste
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04
Research Development Workshop and Outcomes
Area 4
Concentrate and Backwash Management
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Closing
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Conclusions
• ITPM is a largely unexplored area of One Water• We could go in many directions • Best options appear to involve:
— Co-processing of solids— Co-ordinating chemical use
• Local regulations and institutional arrangements are important factors
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AcknowledgementsThis work was made possible through financial support of WRF, BC, and
in-kind donations from the following utilities:
• Denver Water • Los Angeles Department of Water
and Power• Northeast Ohio Regional Sewer
District• Padre Dam Municipal Water District• Water Environment & Reuse
Foundation• Washington Suburban Sanitary
Commission
• American Water• Centennial Water and
Sanitation District• City of Columbus Department
of Public Utilities• City of San Diego • Columbia University • DC Water
40
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Q&A
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Thank You
Comments or Questions
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