Piscataway Bio-Energy Project - wsscwater.com · Piscataway WWTP Bio-Energy ... (Class A) and has...
Transcript of Piscataway Bio-Energy Project - wsscwater.com · Piscataway WWTP Bio-Energy ... (Class A) and has...
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COMMISSION MEETING
Apri l 18, 2018
Engineering and Construction Team
Piscataway WWTP Bio-Energy – Commissioners Status Briefing
Item Number: Table of Contents 1. Commission Summary P. 1-2 2. Presentation P. 3-21
Total Number of Pages 21 (without this cover sheet)
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COMMISSION SUMMARY
AGENDA CATEGORY: Engineering and Construction Team
ITEM NUMBER: DATE: Apri l 18, 2018
SUBJECT
Piscataway WWTP Bio-Energy
SUMMARY SPECIAL COMMENTS
Commissioners Status Briefing
The Bio-Energy Project wil l result in a regional approach and supporting facil i t ies to process and handle wastewater biosolids beneficial ly and cost effectively. The Project wil l create the path to a much-improved biosolids product which is pathogen-free (Class A) and has better aesthetic characteristics. The Project wil l also maximize energy recovery from the methane produced anaerobic digestion. The regional processing facil ity wil l be located at the Piscataway WWTP and wil l include thermal processing, anaerobic digestion, and energy recovery. This briefing is an update to the June 2017 presentation given that the project wil l be on the May 2018 Commission consent agenda.
CONTRACT NO./ REFERENCE NO.
CD5901A15
COSTS
N/A
AMENDMENT/ CHANGE ORDER NO. AMOUNT
N/A
MBE PARTICIPATION
N/A
PRIOR STAFF/ COMMITTEE REVIEW
Chief Engineer, General Manager/CEO
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PRIOR STAFF/ COMMITTEE APPROVALS
RECOMMENDATION TO COMMISSION
N/A
COMMISSION ACTION
N/A
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Goals and objectives
Existing biosolids management practices
Proposed biosolids management plan
Project status update
Budget and schedule
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Total transformation of WSSC biosolids practices Save rate payer dollars through reduced operating
costs Minimize the quantity of biosolids material Develop Class A (pathogen-free) biosolids material Maximize return on investment and energy
recovery from biosolids, fats, oils and grease Reduce greenhouse gas emissions Improve power reliability Reduce nutrient loads to Chesapeake Bay
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Individual handling at 5 WSSC Treatment Plants
Class B land application◦ Meet EPA requirements◦ Land sites in VA
Western Branch◦ Landfills in Virginia
Fats, Oils and Grease◦ By gravity sewer to DC
Water
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Increased regulations will lead to higher costs for Class B disposal
Fewer restrictions on more highly treated Class A biosolids (better product)
Reduce quantity of biosolids to be land applied
Recover energy (resource) during the process
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Biosolids (sludge) will be screened and dewatered at each plant
Haul biosolids from four remote treatment plants to Piscataway WWTP
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Existing Piscataway Facility
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Proposed Concept of Piscataway Bio-Energy Program
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Thermal Hydrolysis◦ “Pressure cooker” - breaks
down cells to improve downstream treatment
Anaerobic Digestion◦ “Digests” solids, reducing
quantity and creating methane gas
Combined Heat and Power◦ Recovers energy from gas
created◦ Provides heat for thermal
hydrolysis process
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Thermal Hydrolysis / Anaerobic Digestion / CHP
Maximizes Energy RecoveryReduces Disposal Volume
Electricity to Plant
Biogas (Methane)
Heat
CHP
Digestion
Fresh steam
Flash Steam
PulperFlashTankReactors
Thermal HydrolysisPre‐treatment
Anaerobic Digestion
Combined Heat and Power
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Reduces volume of biosolids for disposal Mitigates risks with future product use and
regulations Very low odor and highly-stable product Eliminates use of lime Generates 2.7 MW of efficient natural gas
power with steam recovery Reduces WSSC greenhouse gas emissions by
15%
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Advantages Collaborative design Schedule/cost Single source accountability Risk allocation
Selection Process May 2017 – Request for Qualifications September 2017 – Request for Proposals January 2018 – Began negotiations May 2018 – On Commission agenda
WSSC selected Progressive Design-Build to foster and encourage collaboration
and innovation.
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$248.7 million CIP budget Progressive Design-Build Contract ◦ Initial approval – May 2018◦ Design - $22.2 million◦ Early construction - $21.8 million
Contract amendment with Guaranteed Maximum Price◦ Second approval – Summer 2019 ◦ Complete design/construction - $190 million
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Commission approval – May 2018◦ Cambi supply agreement
Notice to Proceed for design – June 2018 Start construction of early work package –
December 2018 Amend contract with Guaranteed Maximum Price –
Late Summer/Early Fall 2019 Construction substantial completion and begin
commissioning – Early 2023
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