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Description: A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis...
A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design
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Description: A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis...
A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design

A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design

A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design

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Description: A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis...
A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design
Abstract
Thermal hydrolysis is a proven anaerobic digestion pretreatment process that is well established in Europe and quickly gaining popularity across the United States. In addition to the installation at Washington DC (DC Water – 450 dtpd), thermal hydrolysis is in design or construction at other large water reclamation facilities (WRFs) in San Francisco (SFPUC – 200 dtpd), Dallas (Trinity River Authority 245 DTPD), and Virginia Beach (Hampton Roads Sanitation District – 92 dtpd). Franklin, Tennessee (29 dtpd) and Pontiac, Michigan (26 dtpd) are examples of smaller WRFs that are planning to utilize thermal hydrolysis to meet their long-term biosolids goals.This paper explores the different design approaches two specific cities took to integrate thermal hydrolysis into their facilities. Many of these differences in design are the result of different drivers, climates, and budgets for the two cities. Some of the key design differences that will be covered in this paper are outlined below:Drivers Leading to the Selection of Thermal HydrolysisStrategies to Address System RedundanciesSteam Production and Biogas UtilizationApproaches to Accepting Hauled in WastesBiosolids End UseFranklin, Tennessee is a rapidly growing, affluent city that is overhauling and expanding its WRF. Franklin selected thermal hydrolysis as a way to achieve Class A Biosolids while maximizing energy recovery from its wastewater treatment process. The Franklin design incorporates a significant level of redundancy in most systems and allows for future expansion to more than double the existing solids loading capacity. Franklin will accept hauled in fats, oils and greases (FOG) for co-digestion in its digesters. The plant will utilize the biogas in CHP engines with heat recovery to generate steam for the THP process, electricity to be consumed on site, and hot water for space and process heating needs.Pontiac, Michigan is city with stagnant growth that is seeking to increase its biosolids treatment capacity to meet existing demands. Pontiac has a Class B land application program, but only has anaerobic digester capacity for half of its biosolids; the remaining half is disposed of in a landfill. Pontiac chose THP to achieve treatment of all the plant’s biosolids without expansion of digester capacity. The Pontiac design incorporates less redundancy than Franklin, with lower capital cost. The upgrades include installation of a new septage receiving facility. Pontiac will use a significant part of its generated biogas to power steam boilers that will provide steam for THP and provide process and space heating for the new biosolids handling building.
Thermal hydrolysis is a proven anaerobic digestion pretreatment process that is well established in Europe and quickly gaining popularity across the United States. In addition to the installation at Washington DC (DC Water – 450 dtpd), thermal hydrolysis is in design or construction at other large water reclamation facilities (WRFs) in San Francisco (SFPUC – 200 dtpd), Dallas (Trinity...
Author(s)
Thomas NangleKristina Warren
SourceProceedings of the Water Environment Federation
SubjectResearch Article
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Apr, 2017
ISSN1938-6478
DOI10.2175/193864717821496266
Volume / Issue2017 / 1
Content sourceResiduals and Biosolids Conference
Copyright2017
Word count420

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Description: A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis...
A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design
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Description: A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis...
A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design
Abstract
Thermal hydrolysis is a proven anaerobic digestion pretreatment process that is well established in Europe and quickly gaining popularity across the United States. In addition to the installation at Washington DC (DC Water – 450 dtpd), thermal hydrolysis is in design or construction at other large water reclamation facilities (WRFs) in San Francisco (SFPUC – 200 dtpd), Dallas (Trinity River Authority 245 DTPD), and Virginia Beach (Hampton Roads Sanitation District – 92 dtpd). Franklin, Tennessee (29 dtpd) and Pontiac, Michigan (26 dtpd) are examples of smaller WRFs that are planning to utilize thermal hydrolysis to meet their long-term biosolids goals.This paper explores the different design approaches two specific cities took to integrate thermal hydrolysis into their facilities. Many of these differences in design are the result of different drivers, climates, and budgets for the two cities. Some of the key design differences that will be covered in this paper are outlined below:Drivers Leading to the Selection of Thermal HydrolysisStrategies to Address System RedundanciesSteam Production and Biogas UtilizationApproaches to Accepting Hauled in WastesBiosolids End UseFranklin, Tennessee is a rapidly growing, affluent city that is overhauling and expanding its WRF. Franklin selected thermal hydrolysis as a way to achieve Class A Biosolids while maximizing energy recovery from its wastewater treatment process. The Franklin design incorporates a significant level of redundancy in most systems and allows for future expansion to more than double the existing solids loading capacity. Franklin will accept hauled in fats, oils and greases (FOG) for co-digestion in its digesters. The plant will utilize the biogas in CHP engines with heat recovery to generate steam for the THP process, electricity to be consumed on site, and hot water for space and process heating needs.Pontiac, Michigan is city with stagnant growth that is seeking to increase its biosolids treatment capacity to meet existing demands. Pontiac has a Class B land application program, but only has anaerobic digester capacity for half of its biosolids; the remaining half is disposed of in a landfill. Pontiac chose THP to achieve treatment of all the plant’s biosolids without expansion of digester capacity. The Pontiac design incorporates less redundancy than Franklin, with lower capital cost. The upgrades include installation of a new septage receiving facility. Pontiac will use a significant part of its generated biogas to power steam boilers that will provide steam for THP and provide process and space heating for the new biosolids handling building.
Thermal hydrolysis is a proven anaerobic digestion pretreatment process that is well established in Europe and quickly gaining popularity across the United States. In addition to the installation at Washington DC (DC Water – 450 dtpd), thermal hydrolysis is in design or construction at other large water reclamation facilities (WRFs) in San Francisco (SFPUC – 200 dtpd), Dallas (Trinity...
Author(s)
Thomas NangleKristina Warren
SourceProceedings of the Water Environment Federation
SubjectResearch Article
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Apr, 2017
ISSN1938-6478
DOI10.2175/193864717821496266
Volume / Issue2017 / 1
Content sourceResiduals and Biosolids Conference
Copyright2017
Word count420

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Thomas Nangle# Kristina Warren. A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design. Alexandria, VA 22314-1994, USA: Water Environment Federation, 2018. Web. 1 Jul. 2025. <https://www.accesswater.org?id=-279691CITANCHOR>.
Thomas Nangle# Kristina Warren. A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design. Alexandria, VA 22314-1994, USA: Water Environment Federation, 2018. Accessed July 1, 2025. https://www.accesswater.org/?id=-279691CITANCHOR.
Thomas Nangle# Kristina Warren
A Tale of Two Cities: How Climate, Drivers, and Budget Affect Thermal Hydrolysis Design
Access Water
Water Environment Federation
December 22, 2018
July 1, 2025
https://www.accesswater.org/?id=-279691CITANCHOR