A.J. Englande, Jr., Ph.D., P.E., DEE [email protected] … · 2016-06-23 · A.J. Englande, Jr.,...
Transcript of A.J. Englande, Jr., Ph.D., P.E., DEE [email protected] … · 2016-06-23 · A.J. Englande, Jr.,...
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A.J. Englande, Jr., Ph.D., P.E., DEE
Department of Global Environmental Health Sciences, Tulane University School of Public Health and Tropical Medicine,
New Orleans, USA.
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Present overview of waste
management practices
emphasizing sustainability
of resources, total water
cycle and innovative
technology
Emphasis on regulatory
U.S. trends; source
reduction; toxicity/reuse
characterization and
monitoring; pretreatment
methods; treatment
technologies; and
residuals management
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Historical Perspective
New Paradigm
Policy
Regulations
Process Options
Pretreatment Techniques
Treatment Trends/ Innovative Treatment
Future Facility Design
Residuals Management
Areas for Research & Development
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End of pipe treatment/ President Nixon 1970 USEPA
Clean Water Act 1972 & 1987 amendments;◦ Shift from technology based to water quality based regulations
◦ Focus on both point and non-point source (diffuse) pollution
◦ Watershed management based approach
◦ Focus on thermal discharges
◦ Focus on toxicity (priority pollutants) & WET testing (bioassays)
◦ Initiated controls on residuals management
◦ Periodic revisions of effluent limitations guidelines
Safe Drinking Water Act 1974 & 1986 and 1996 amendments;
Clean Air Act 1990 (VOCs & fugitive emissions)
Oil Pollution Control Act of 1990;
Contaminants of Emerging concern (CEC)- POPs, PPCPs, EDCs, nanoparticles, etc.
New Paradigm- resource management/ sustainable development & production/ full water cycle management
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Legislation
•e.g. Clean
Water Act
Regulation•Standards
•Permits
•Enforcement
Policies
and
Guidance
•Published guidance
resources (Scientific
Input)
•Public education
40CFR
Code of
Federal
Regulations
Federal
Register
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Stringent limits for selected
pollutants/mixtures
Establishment of standards beyond
technology based
Ecosystem protection/targeting of
critical eco-systems
Risk based assessment approaches for
standard setting (prioritize efforts &
resources)
Multimedia approach
Prevention instead of remediation
Product life cycle considerations
Global/Regional criteria/standards
(trade concerns, global effects)
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Ability to satisfy the basic
needs of society today
without compromise of
those for future
generations.
Waste Management
considered as
management of natural
resources so that present
and future beneficial uses
are not impaired.
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Soundness of ecosystem structure and function/eco-integrity
Compatible Environmental management
Maximize Beneficial Resource Utilization
Define Best Practical Environmental Control Options
Design /operate treatment facilities consistent with sustainability goal
Consideration of total water cycle in analysis
Requires:
Holistic- energy & material balances, reuse opportunities, GHG, etc.
Multimedia
Integrated
Cost - effective
Focused on public health / environmental protection
“Cradle to cradle” philosophy
Approach
Requires
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Policy
development
Increasing
stringent
regulations
Uncertainty of
ecotoxicological
effects
•Toxicity
•Persistency and
environmental fate
•Global impacts
Dwindling
resources
Climate
Change
Increasing
energy cost
Public
Awareness
and
participation
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Process optimizationWaste
reduction/reuse/avoidanceBy product recovery
Toxicity/ reuse characterization & monitoring
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Identification and
quantification of toxicity
Methodologies useful for
cost-effective selection of
alternatives for toxicity
elimination/reduction
Evaluation of toxics
effects on treatment
systems
Assessment of impacts on
biological integrity and
ecological function of the
environment
Environmental and human
health risk assessments
Bioassays specific for
residuals reuse
Process and system
monitoring
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Enzyme biomarkers - yeast strain used to detect
presence of dioxin, PAHs in environmental
samples/monitoring
Non-mammalian carcinogen screening protocols -
Japanese medaka used for screening of munitions
chemicals, disinfection by-products and multi-chemical
contaminants in waters
Endocrine disrupters - in vitro assays to evaluate
hormonal affects due to chemicals or residuals
Assays to assess inhibition/toxicity
Online monitoring and remote sensing techniques
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Reduce persistent organics/toxic constituents of
wastewater to acceptable levels
Alternative technologies for toxicity reduction
Remove problem components and/or render waste
streams more amendable for biotechnology application
Source control
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Source control/ Stream segregation
Chemical/AOP pretreatment
VOC reduction by acclimated
biomass/ biofilters/ bio-
scrubbers/ PAC addition
Multi-stage treatment for high
strength waste/enhance specific
contaminant removal
Selector design to reduce sludge
bulking
Process control optimization /
variability reduction
Enhanced characterization /
monitoring techniques (on-line,
real time, predictive models)
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PAC added to activated sludge
Adsorbs contaminants
Reduce shock loads and toxic/Inhibitory compounds
Provide a media for microattachment
Increases sludge age
Enhanced nitrification and POP/CEC removals
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ClarifierAeration Basin
Recycle Flow (Qr)
Feed Flow (Q) Q+Qr Overflow (Q)Plastic Media
Media Screen
Coarse bubble Aeration
Media Size and Shape Varies
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Uses aerobic microbial granules which settle much faster than activated sludge floc
Develop in SBRs under specific conditions
Can use flow thru reactors with initial attached growth, short retention time reactor followed by suspended growth reactor. Enzymes produced in first promote granular formation
Presence of aerobic and anoxic zones inside granules can get N & P removals
Advantages:
◦ Lower energy needed
◦ Reduced footprint (75%)
◦ Lower cost (20% savings)
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Alternative to conventional nitrification/denitrification suspended growth systems developed at Delft University of Technology
Anammox bacteria convert ammonium ion and nitrite ion into nitrogen gas anaerobicallyNH4
+ +NO2- → N2 +2H2O
Sludge age must be low enough to wash out nitrobacter so nitrite not oxidized to nitrate. Anammox slow growers so need SRT > 20 days.
Less power required; less sludge; no external carbon needed; less CO2 emissions
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See demonstration from Paques:
https://youtu.be/NJmOjJ87X68
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Alum, Ferric
Waste Sludge
and Scum
MembranesAerobic
Lower DOAnoxic
An
ae
ro
bic
Effluent
Influent
Methanol
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Maximum process/treatment
efficiency, nutrient removal, less
noise and odor, low cost, minimal
space requirements, low energy
consumption, low GHG emissions
and low residuals production.
Future facilities will offer
integrated processes to maximize
resource recovery and provide
end-products suitable for reuse
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Innovative activated sludge processes
Biological fluidized bed reactors (moving Bed Bioreactors-MBBR)
aerobic/anoxic/anaerobic conditions
Nutrient Removal
Membranes
Anaerobic technologies (high rate fixed film, granular sludge bed reactors- UASB & hybirds)
Advanced Oxidation Technologies
Specialized resins and adsorption systems Improved targeting of specific pollutants/product recovery
opportunities
Pollutant “Reduction” Technologies
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Industry Process Water
Sewage
Storm-water
Non Contact Cooling Effluent
Enabling Reuse Technologies
Biological TreatmentPathogen destruction
MembranesPhys/Chem Treatment
Advanced OxidationEvaporation/Crystallization
Uses
Residuals
•Energy recovery
•Nutrients mining
•Agriculture
•Construction Industry
•Agricultural Reuse
•Non-potable urban reuse
•District Cooling
•GW recharge
•Stream augmentation
•Cooling Tower makeup
•Fire fighting water
•Quench water
•Scrubbers
•Raw water supply
•Boiler Feed Water
•Product Water
•Green area irrigation
Waste disposal:
• Incineration
• Landfill
Discharge to Environment
Energy Chemicals
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Our Changing View of Solids Management
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Pathogen destruction
Stabilization
Eco friendly
Low odor potential
Low reactivation potential
Public
Acceptance!!!!!
“Public Acceptance will be the main obstacle to biosolids
disposal/use viability” – Water Environment Federation
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Defined by: Heavy metals
Organics
Pathogens
Vector attraction
Stability◦ Pubic Health Issues (pathogen reduction/regrowth, vector
attraction, etc.)
◦ Odor
◦ Geostability
◦ Appearance
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In the United States, the disinfected biosolids is defined as Class A and partially disinfected as ClassB.
The categories are broken up into three classifications:
1. Bacteria
2. Viruses
3. Parasites
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Process Inactivation Concerns
Aerobic Digestion Time/Temp (Thermophilic)
O2 Transfer, Solids Content, Bioaerosols
Anaerobic Digestion By Products/Time/Temp (Thermophilic)
Solids Content, Odor, Bioaerosols, pH
Composting By Products/Time/Temp (Thermophilic)
Solids Content, Odor, Bioaerosols, pH
Alkaline Stabilization Ammonia/Time/Temp Solids Content, Odor, Aerosols, pH
Heat Drying Time/Temp(>80oC)
Explosions, Odor, Aerosols
Irradiation(Gamma, Beta)
>1 megarad Solids Content, Stabilization
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Heavy Metals
Microconstituents (EDCs, Antibiotic Resistant Drugs, etc.)
Phosphorus Loadings
Controversy exist concerning issues related to risk assessment
Assessment in the U.S. is determined by a three tier approach
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1. Tier I – Assumes that all the constituent analyzed in the soil, sediment, biosolids or slurry is released 100% to the environment. This is an conservative assessment.
2. Tier II – Assesses the potential of the adsorbed constituents to release under specific conditions to the aquatic environment (extraction testing).
3. Tier III - Assesses the potential biological impact of a constituent to bioaccumulate or effect the biota/organisms.
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Disinfect/ stabilize
Short treatment time
Inexpensive
Easy maintenance
Consistent, viable, and marketable product
Competitive selling price
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Commercial Fertilizers Activated Carbon Ion Exchange Resins Light Weight Aggregate Ag lime Agents Engineered Soils Biochar Biopolymers
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Process Biosolids Products
Pyrolysis Treatment Activated Carbon, Biochar and Fuels
Thermal Treatment/Drying Fuel/Fertilizer/Turf Grass
Biological Anaerobic Digestion Biogas/Soil Amender/ Turf Grass
Thermal Hydrolysis Pretreatment Biogas/Soil Amender/Turf Grass
Aerobic Digestion Soil Amender/Turf Grass
Advanced Open Alkaline Stabilization
Aglime Agent/Engineered Soils
Advanced Closed Alkaline Stabilization
Aglime Agent/Turf Grass/Fertilizer/Engineered Soils
Acid Stabilization/Disinfection Soil Amender/Turf Grass
Modified Commercial Fertilizer Commercial Fertilizer
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Dewatering- simplicity, enclosed units, enhanced performance
Nutrient harvesting
Odor elimination
Energy Optimization
Solids Minimization
Waste to Energy
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Ethanol Production from Agricultural Wastes, Pulp and Paper Residuals and Municipal Solid Wastes
Biogas Production from Manures, Biosolids, Food Residuals and Pulp and Paper Wastes
Production of Fuels from Pyrolysis of Municipal Sludges, Manures, Agriculture Vegetative Wastes (Sugarcane Baggus) etc. and Industrial Organic Wastes
Biosolids’ Residuals Blended with Coals to enhance Combustion Efficiency and Emission Releases (N-
Viro Soil)
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Value-Added ProductRelative Value based
on cost/dry ton
Activated Carbon 15
Organic Polymers 5
Biochar 4
Commercial Fertilizers 2.5
Turf Grass 2.2
Struvite/Ammonia Fertilizer 2
Synthetic Coal 1
Residual Fuel 0.6
Biogas 0.5
Low Grade Dried Fertilizer 0.7
Aglime Agent 0.4
Soil Amender 0.2
Light Weight Aggregate (Light Weight Cement) 0.2
Road Bed Material/Landfill Cover 0.1
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Agricultural benefits enhanced by blending with manures, metal oxides, etc, for specific end-uses
Product quality needs will determine solids handling / liquid train processes
Incineration/thermal solidification methods feasible where volume reduction important and/or not suitable for agricultural use
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Reduction in process / end-product variability
and enhanced quality control
Innovative/integrated technology development
Life-cycle analysis
Toxicity /reuse characterization / monitoring
Practical molecular biology ID /
Quantification
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Ecotoxicity assessment evaluation/risk based approaches
Better residuals characterization methods
Value-added product development
Improved cost models / practices for assessing true economic benefit for sustainability.
Life-cycle analysis (BMP, materials used, energy, greenhouse gas emissions, odor, volume reduction, acceptability)
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New / emerging environmental control technologies offer opportunity for progress
towards sustainability
Biotechnology development/application key to sustainable development
attainment
“Value-added” product ; innovative and integrated technologies - areas of
opportunity
Presentation offers point of reference based on collective experience
International cooperation and inter-disciplinary collaboration essential
Community education & outreach/participation; policy formulation/implementation
critical factors