A Biological Process Eliminating The Production Of Sludge
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Feasibility Study for Production of Biogas from Wastewater and Sewage Sludge – Development of a Sustainability Assessment Framework and its Application
Abstract
Clean water and renewable energy are essential requirements to build resilience towards the adverse effects of climate change and global warming. Advanced wastewater treatment
options may provide a unique opportunity to recover various useful resources such as energy (biogas), fertilizers, minerals, and metals embedded in the wastewater stream. However,
considerable challenges remain when it comes to designing and planning sustainable wastewater treatment systems. This thesis focuses on the avenues of energy recovery from wastewater treatment plants (WWTP), by evaluating the potential for biogas recovery from wastewater and sewage sludge treatment in WWTPs. Various available technologies for biogas recovery are examined and evaluated to understand their viability in different applications and relative performance. Further, the methodologies and tools employed to assess such energy recovery systems are evaluated, covering the technical, economic, and environmental performance aspects. A sustainability assessment framework is then developed, using appropriate sustainability indicators to assess performance. The framework is applied to a case study of a WWTP in the emerging city of Tbilisi, Georgia. A spreadsheet tool is also developed to aid the sustainability (techno-economic and environmental) assessments for the case study. The case study results reveal a significant biogas recovery potential, with an annual energy generation potential of 130 GWh from combined heat and power (CHP) recovery, and a potential to avoid 28,200 tCO2eq emissions every year when biogas is recovered only from the wastewater. The recovery potential increases when biogas is recovered from both wastewater and sewage sludge. Further, the contribution of overall resource (energy and nutrient) recovery in WWTPs to the Sustainable Development Goals is examined. By studying the linkage of various benefits to the different SDGs, the multilateral and cross-cutting nature of benefits from resource recovery is clearly illustrated. The thesis concludes with a discussion of possible future technologies and perspectives that can enhance the sustainability of WWTPs and help transform them into Wastewater Resource Recovery Facilities (WRRFs).
Feasibility Study for Production of Biogas from Wastewater and Sewage Sludge – Development of a Sustainability Assessment Framework and its Application
Abstract
Clean water and renewable energy are essential requirements to build resilience towards the adverse effects of climate change and global warming. Advanced wastewater treatment
options may provide a unique opportunity to recover various useful resources such as energy (biogas), fertilizers, minerals, and metals embedded in the wastewater stream. However,
considerable challenges remain when it comes to designing and planning sustainable wastewater treatment systems. This thesis focuses on the avenues of energy recovery from wastewater treatment plants (WWTP), by evaluating the potential for biogas recovery from wastewater and sewage sludge treatment in WWTPs. Various available technologies for biogas recovery are examined and evaluated to understand their viability in different applications and relative performance. Further, the methodologies and tools employed to assess such energy recovery systems are evaluated, covering the technical, economic, and environmental performance aspects. A sustainability assessment framework is then developed, using appropriate sustainability indicators to assess performance. The framework is applied to a case study of a WWTP in the emerging city of Tbilisi, Georgia. A spreadsheet tool is also developed to aid the sustainability (techno-economic and environmental) assessments for the case study. The case study results reveal a significant biogas recovery potential, with an annual energy generation potential of 130 GWh from combined heat and power (CHP) recovery, and a potential to avoid 28,200 tCO2eq emissions every year when biogas is recovered only from the wastewater. The recovery potential increases when biogas is recovered from both wastewater and sewage sludge. Further, the contribution of overall resource (energy and nutrient) recovery in WWTPs to the Sustainable Development Goals is examined. By studying the linkage of various benefits to the different SDGs, the multilateral and cross-cutting nature of benefits from resource recovery is clearly illustrated. The thesis concludes with a discussion of possible future technologies and perspectives that can enhance the sustainability of WWTPs and help transform them into Wastewater Resource Recovery Facilities (WRRFs).
Enhanced Anaerobic Digestion and Hydrocarbon Precursor Production from Sewage Sludge
. Ultimate Goal: Transform negative-value or low-value biosolids into high-energy-density, fungible hydrocarbon precursors.
.Enables sustainable production of biogas that is considered as a cellulosic biofuel under new RFS2 (EPA, July 2014).
.Addresses DOE's goals of development of cost-competitive and sustainable biofuels by advancing efficient production strategies for drop-in biofuels.
Enhanced Anaerobic Digestion and Hydrocarbon Precursor Production from Sewage Sludge
. Ultimate Goal: Transform negative-value or low-value biosolids into high-energy-density, fungible hydrocarbon precursors.
.Enables sustainable production of biogas that is considered as a cellulosic biofuel under new RFS2 (EPA, July 2014).
.Addresses DOE's goals of development of cost-competitive and sustainable biofuels by advancing efficient production strategies for drop-in biofuels.
Global Atlas of Excreta, Wastewater Sludge, and Biosolids Management
It is crystal clear that, in addition to clean air, the well-being of our planet also requires that water, wastewater and the resulting biosolids (sludge) need to be managed more seriously, and in a focused, coordinated and cooperative manner. The idea for the creation of this Global Atlas of Excreta, Wastewater Sludge, and Biosolids Management originated at the IWA Biosolids Conference, “Moving Forward Wastewater Biosolids Sustainability: Technical, Managerial, and Public Synergy” held in Moncton, New Brunswick, Canada in June 2007. At this conference representatives of the International Water Association (IWA), Water Environmental Federation (WEF) and European Water Association (EWA) agreed that it would be very useful to produce a current edition of the “Global Atlas of Wastewater Sludge and Biosolids Use and Disposal” which had been published in 1996, with Peter Matthews being
the original editor.
Global Atlas of Excreta, Wastewater Sludge, and Biosolids Management
It is crystal clear that, in addition to clean air, the well-being of our planet also requires that water, wastewater and the resulting biosolids (sludge) need to be managed more seriously, and in a focused, coordinated and cooperative manner. The idea for the creation of this Global Atlas of Excreta, Wastewater Sludge, and Biosolids Management originated at the IWA Biosolids Conference, “Moving Forward Wastewater Biosolids Sustainability: Technical, Managerial, and Public Synergy” held in Moncton, New Brunswick, Canada in June 2007. At this conference representatives of the International Water Association (IWA), Water Environmental Federation (WEF) and European Water Association (EWA) agreed that it would be very useful to produce a current edition of the “Global Atlas of Wastewater Sludge and Biosolids Use and Disposal” which had been published in 1996, with Peter Matthews being
the original editor.
Activated Sludge Aeration Waste Heat for Membrane Evaporation of Desalination Brine Concentrate: A Bench Scale Collaborative Study
This study examines a potential membrane evaporation process to reduce brine concentrate volume at the San Antonio Water System’s (SAWS) 45.4 million liters per day (MLD) brackish water desalination facility in San Antonio, Texas, which is currently being constructed. This facility is a reverse osmosis (RO) process operating with 90% recovery by blending 37.9 MLD of permeate with 7.6 MLD of bypass water, producing 4.2 MLD of brine concentrate. The brine concentrate residuals are to be disposed of through deep-well injection. The deep-well injection process is anticipated to be expensive due to well-drilling costs and maintenance costs of operating at high injection pressures. Membrane evaporation systems are promising because they are compact systems and they can be used with low grade waste heat energy sources. This study investigates the potential of coupling membrane evaporation with waste heat generated from activated sludge aeration blowers.
Activated Sludge Aeration Waste Heat for Membrane Evaporation of Desalination Brine Concentrate: A Bench Scale Collaborative Study
This study examines a potential membrane evaporation process to reduce brine concentrate volume at the San Antonio Water System’s (SAWS) 45.4 million liters per day (MLD) brackish water desalination facility in San Antonio, Texas, which is currently being constructed. This facility is a reverse osmosis (RO) process operating with 90% recovery by blending 37.9 MLD of permeate with 7.6 MLD of bypass water, producing 4.2 MLD of brine concentrate. The brine concentrate residuals are to be disposed of through deep-well injection. The deep-well injection process is anticipated to be expensive due to well-drilling costs and maintenance costs of operating at high injection pressures. Membrane evaporation systems are promising because they are compact systems and they can be used with low grade waste heat energy sources. This study investigates the potential of coupling membrane evaporation with waste heat generated from activated sludge aeration blowers.
A Detailed Assessment of The Science and Technology of Odor Measurement
INTRODUCTION
Odors remain at the top of air pollution complaints to regulators and government bodies around the U.S. and internationally. Ambient air holds a mixture of chemicals from everyday activities of industrial and commercial enterprises.
A person’s olfactory sense, the sense of smell, gives a person the ability to detect the presence of some chemicals in the ambient air. Not all chemicals are odorants, but when they are, a person may be able to detect their presence. Therefore, an odor perceived by a person’s olfactory sense can be an early warning or may simply be a marker for the presence of air emissions from a facility. For whatever reason, it is a person’s sense of smell that can lead to a complaint. When facility odors affect air quality and cause citizen complaints, an investigation of those odors may require that specific odorants be measured and that odorous air be measured using standardized scientific methods. Point emission sources, area emission sources, and volume emission sources can be sampled and the samples sent to an odor laboratory for testing of odor parameters, such as odor concentration, odor intensity, odor persistence, and odor characterization. Odor can also be measured and quantified directly in the ambient air, at the property line and in the community, using standard field olfactometry practices, e.g. odor intensity referencing scales and field olfactometers.
A Detailed Assessment of The Science and Technology of Odor Measurement
INTRODUCTION
Odors remain at the top of air pollution complaints to regulators and government bodies around the U.S. and internationally. Ambient air holds a mixture of chemicals from everyday activities of industrial and commercial enterprises.
A person’s olfactory sense, the sense of smell, gives a person the ability to detect the presence of some chemicals in the ambient air. Not all chemicals are odorants, but when they are, a person may be able to detect their presence. Therefore, an odor perceived by a person’s olfactory sense can be an early warning or may simply be a marker for the presence of air emissions from a facility. For whatever reason, it is a person’s sense of smell that can lead to a complaint. When facility odors affect air quality and cause citizen complaints, an investigation of those odors may require that specific odorants be measured and that odorous air be measured using standardized scientific methods. Point emission sources, area emission sources, and volume emission sources can be sampled and the samples sent to an odor laboratory for testing of odor parameters, such as odor concentration, odor intensity, odor persistence, and odor characterization. Odor can also be measured and quantified directly in the ambient air, at the property line and in the community, using standard field olfactometry practices, e.g. odor intensity referencing scales and field olfactometers.
Drinking Water Treatment Plant Residuals Management Technical Report
INTRODUCTION
The U.S. Environmental Protection Agency (EPA) completed a review of discharges from water treatment plants (WTPs). The purpose of this report is to summarize the data collected during this review (principally covered in Sections 2, 3, 9, 10, and 11) and to serve as a technical resource to permit writers (primarily covered in Sections 4 through 8 and Sections 12 and 13). EPA selected the drinking water treatment (DWT) industry for a rulemaking as part of its 2004 Biennial Effluent Limitations and Guidelines Program planning process. EPA is not at this time continuing its effluent guidelines rulemaking for the DWT industry. In the 2004 Plan, EPA announced that it would begin development of a regulation to control the pollutants discharged from medium and large DWT plants. See 69 FR 53720 (September 2, 2004). Based on a preliminary study and on public comments, EPA was interested in the potential volume of discharges associated with drinking water facilities. The preliminary data were not conclusive, and the Agency proceeded with additional study and analysis of treatability, including an industry survey. After considering extensive information about the industry, its treatment residuals, wastewater treatment options, and discharge characteristics, and after considering other priorities, EPA has suspended work on this rulemaking.
Drinking Water Treatment Plant Residuals Management Technical Report
INTRODUCTION
The U.S. Environmental Protection Agency (EPA) completed a review of discharges from water treatment plants (WTPs). The purpose of this report is to summarize the data collected during this review (principally covered in Sections 2, 3, 9, 10, and 11) and to serve as a technical resource to permit writers (primarily covered in Sections 4 through 8 and Sections 12 and 13). EPA selected the drinking water treatment (DWT) industry for a rulemaking as part of its 2004 Biennial Effluent Limitations and Guidelines Program planning process. EPA is not at this time continuing its effluent guidelines rulemaking for the DWT industry. In the 2004 Plan, EPA announced that it would begin development of a regulation to control the pollutants discharged from medium and large DWT plants. See 69 FR 53720 (September 2, 2004). Based on a preliminary study and on public comments, EPA was interested in the potential volume of discharges associated with drinking water facilities. The preliminary data were not conclusive, and the Agency proceeded with additional study and analysis of treatability, including an industry survey. After considering extensive information about the industry, its treatment residuals, wastewater treatment options, and discharge characteristics, and after considering other priorities, EPA has suspended work on this rulemaking.
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