obg presents: webinar: treating emerging contaminants both … · 2019-12-03 · during 1992-1997,...
TRANSCRIPT
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OBG PRESENTS:
Webinar: Treating Emerging Contaminants – Both Conventional and Advanced Treatment TechnologiesScott A. Grieco, PhD, PE June 21, 2016
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AGENDAEmerging Contaminants Categories
Environmental Detections
EC Regulations
Biological Treatment
Physical/Chemical Treatment
Q/A?
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What Are Emerging Contaminants?
▪ Compounds
▪ Pharmaceuticals
▪ Personal care products
▪ Antibiotics
▪ Sterols and hormones
▪ Endocrine disrupters
▪ Herbicides/pesticides
▪ Flame retardants
▪ Others
▪ Varying chemical properties
▪ Dissimilar structures and functional groups
▪ Molecular size
▪ Polarity
▪ Solubility
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Health concerns regarding EC’s
▪ Many are classified as
▪ Potentially carcinogenic
▪ Impactful to the endocrine system & cellular development
▪ There still is a scarcity of data on human health and ecosystem effects:
▪ At environmental levels
▪ In multi-component mixture
▪ Chronic or generational effects
▪ Metabolites may be more persistent or toxic than parent compound
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Sources of ECs
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Ubiquitous Nature of ECs
Example studies
▪ Loos (2009) - Europe
▪ 122 river sampling stations
▪ 27 countries
▪ 35 compounds
▪ Kolpin (2002); Focazio (2008)
▪ 139 stream samples
▪ 74 public drinking water supplies
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Status of EC regulations
▪ No existing Federal regulations
▪ There are non-enforceable Health Advisories for some compounds
▪ Contaminant Candidate Lists (CCL)
▪ Unregulated Contaminant Monitoring Rule (UCMR)
▪ FDA requires ecological testing of pharmaceuticals when environmental concentration exceeds 1 μg/L.
▪ Certain states have independent standards for specific compounds
▪ 147 compounds are likely to be environmentally persistent in the environment (Bolong, 2009)
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How can we treat ECs ?
▪ Biological
▪ Physical/Chemical
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Biological Treatment
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0.1 10 1000 100000
17alpha-ethynylestradiol (EE2) testosterone
7 beta-estradiol (E2), 2,4 DCP, azithromycin, BHT, bupropion,
ciproflaxin, estrone (E1), fluoxetine, malathion, norfloxacin,
paracetamol, setralineATH(Traseolide), BHA, cimetidine, dehydronifedipine, diazepam,
dlitiazem, diphenhydramine, indolebutyric acid, lindane,
primidone, benzophenoneCarbaryl, chlorpyrifos, diazinon, diethylphthalate, estriol (E3),
fenofibrate, phenazone, propanolol, triclocarban, trimethoprim
Sulfamethoxazole, TCEP, Tetrachloroethene, venlaflaxin
Gemfibrozil, HHCB, iopromide, lincomycin, roxithromycin
4-methylphenol, 4-OP (mono,di) Eos, bis-2-ethylhexylhphthalate,
clofibric acid, fenobiric acid
AHTN, atenolol, bezfibrate, cholesterol, DEET, diclofenac,
erythromycin, Fluoranthene, ketoprofen, mefenamic acid,
metoprolol, naproxen, Pyrene, TDCPP, triclosan1,4 Dichlorobenzene, acetaminophen, atrazine, carbamazepine,
nonylphenol, phthalic anhydride
Bisphenol A, Ibuprofen, NonylPhenol, NPEOs, TBEP, TCPP
POTW EFFLUENTS
ng/L
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Bisphenol A Effluent Concentration vs. Treatment SRT
0
500
1000
1500
2000
0 10 20 30 40 50
SRT
PPT
BP-A Data fromReference Papers
Biological WWTP
▪ Increasing Sludge Retention Time (SRT) can improve removal for some ECs
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Biological Wastewater Treatment
▪ Biological processes can treat many of the identified ECs.
▪ Constraints to consider: Concentration; Configuration; System Operation
▪ Example ECs persistent through aerobic systems:
▪ carbamazepine, erythromycin, hydrochlorothiazide, indomethacine, metoprolol, and tris(2-chloroethyl) phosphate (TCEP), PFAAs
▪ Persistent ECs not effectively treated within mesophilic or thermophilic anaerobic systems
▪ Key issue for sludge digestion & biosolids disposal
▪ 30% solids = 70% water
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Biological Wastewater Treatment
▪ Improve existing treatment
▪ Increase SRT
▪ Alternative technologies
▪ Membrane bioreactor (MBR)
▪ Enhanced Powered Activated Carbon Treatment (PACT)
▪ For the most persistent constituents additional treatment will likely be required.
▪ Many ECs still lack adequate study
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MBR Technology
MBR plants are typically 1/3 to 1/4 the size of conventional activated sludge-type treatment plants
MBR produce significantly less sludge, operate at high MLSS & long SRT
MBR technology combines the functions of a clarifier and filter
MBR technology provides consistent solids free effluent
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MBR Treatment
▪ Submerged Membranes
▪ Higher flows / Conventional WW
▪ GE Water – ZeeWeed
▪ Kubota – Flat sheet
▪ External Membranes
▪ Smaller flows / higher flux
▪ Berghof
▪ Pentair
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Physical/Chemical Treatment
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Adsorption
Adsorption vs. Absorption
▪ Adsorption is accumulation of molecules on a surface in contact with an air or water phase
▪ Absorption is dissolution of molecules within a phase (e.g., fume scrubber)
gas H aqP K c
ASSA
eL
eLe
ck
ckqq
1
max
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Causes of Adsorption
▪ Dislike of Water Phase – ‘Hydrophobicity’
▪ Attraction to the Sorbent Surface
▪ van der Waals forces: physical attraction
▪ electrostatic forces (surface charge interaction)
▪ chemical forces (e.g., - and hydrogen bonding)
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DIFFUSION
▪ Process where solute goes from regions of higher concentration to regions of lower concentration
▪ Fick’s Law:
▪ Predicts how diffusion causes the concentration to change with time
2
2
r
CD
dt
dCe
Boundary LayerTransport
Pore DiffusionJP = -DPc
Surface DiffusionJS = -DSq
Local Equilibriumq = q*(c)
Adsorbent
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Activated Carbon
▪ Natural Material
▪ Bituminous coal
▪ Coconut shell
▪ Wood
▪ Heterogeneous
▪ Chemical differences (functional groups, metals)
▪ Pore sizes
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Activated Carbon
Source: 2007 AWWARF Report (Snyder et. al.)
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Synthetic Media
Base material: styrene-based copolymer
Made by controlled pyrolysis of bead (activation)
Technical advantages:
Manufactured “engineered” product
Improved pore distribution: Fast kinetics and high capacity
Pure organic – no ash
MaterialMicro-pores (<20A)
Meso-pores
(20 to 500A)
Macro-pores
(>500A)Total >20 / Tot
OptiporeL493
0.50 0.35 0.31 1.16 0.57
Ambersorb563
0.23 0.14 0.23 0.60 0.61
FiltrasorbF400
0.48 0.09 0.04 0.61 0.21
*Values in cc/g
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Comparison to Carbon for 1,4-Dioxane
Source: Woodard, S., Remediation, 2014
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System Configuration
Pre-filters / adsorption columns
Requires on-site regenerationSteam or caustic
Liquid residual product requires management / disposalSignificant volume reduction
Source: Woodard, S., Remediation, 2014
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Adsorption Applicability
Design Factors
Contact time
Type of adsorbent (carbon type or synthetic)
Site Factors
Competitive adsorption / desorption
Inorganics
NOM
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Site Specific Evaluation
Concentrations, Flows, Background water quality
Rapid Small-Scale Column Testing (RSSCT)
Small column, high-throughput testing
Simulate months / years full-scale operation in days timeframe
Scalable results to size full-scale system
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Oxidation
Oxidizing reactions break chemical bonds and destroy
organic compounds
Complete Oxidation
Organic (C-H-O-N-S) + Oxidant CO2 + H20 + Salts
Incomplete Oxidation
Organic (C-H-O-N-S) + Oxidant Smaller Organics
Effectiveness based on:
Chemical structure
Electrochemistry (types / number of bonds)
Configuration of organic molecule
Relative power of oxidant
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UV
Source: 2007 AWWARF Report (Snyder et. al.)
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Ultraviolet (UV) / Ozone (O3)
Ultraviolet (UV) / Hydrogen Peroxide (H2O2)
Hydrogen Peroxide (H2O2) / Ozone (O3)
UV / Titanium dioxide (TiO2)
Advanced Oxidation:
Radical generation
Hydroxyl radical(OH)
HOOHOHOH h 32222
HOOHOOH 2322 2
HOOHOHO h
223 2
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UV/H2O2 (Advanced Oxidation)
Source: 2007 AWWARF Report (Snyder et. al.)
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ECs of Current Interest1,4-Dioxane
Perfluorinated Compounds
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1,4-Dioxane
Historically, 90% of U.S. production used as stabilizer in chlorinated solvents, mainly 1,1,1-TCA (USEPA, 2015)
2-8% typical content in 1,1,1-TCA (Mohr, 2010)
Henderson et al., Integrated Env. Assessment & Management, 2012, Co-occurrence of 1,4-Dioxane with Trichloroethene
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14Dx: Occurrence Not Just From Stabilizers
CONSUMER PRODUCTS
“During 1992-1997, the average concentration of 1,4-dioxane in some cosmetic products reportedly ranged from 14 to 79 mg/kg.
In a more recent survey reported by the Campaign for Safe Cosmetics, the levels of 1,4-dioxane in cosmetic products were found to be lower (1.5-12 ppm in baby and children's products and 2-23 ppm in adult products) than in the survey done by the FDA in the 1990s.”
Source: ATSDR
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14Dx: Properties
Completely miscible in water
Octanol-water partitioning (Log Kow = -0.27)Highly hydrophilic
Henry’s Constant (4.8x10-6 atm-m3/mol)Low volatility
Single-bonded cyclical ether (C4H8O2)Requires high energy to oxidize chemical bonds
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14Dx: Example Media-Specific Target Values
USEPA tap water screening level (1x10-6 ELCR) (USEPA, 2013)
USEPA regional screening level (RSL)
New Jersey groundwater quality standard
USEPA risk assessments (1x10-6 ELCR) (USEPA, IRIS, 2013)
Vermont health advisory
Massachusetts drinking water limit
New Hampshire public water supply reporting limit
0.67 μg/L
0.46 μg/L
0.40 μg/L
0.35 μg/L
0.30 μg/L
0.30 μg/L
0.25 μg/L
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Example of 1,4-D Co-contaminant Site
3 month breakthrough
Competitive effects removed through lead bed
Benefit of combined technologies: AOP – GAC
Source: OBG
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Advanced Oxidation Applications
Mountain View, CA
HiPOx technology
Operational since 2003
15 µg/L 1,4-Dx with > 10,000 µg/L DCE / TCE
Colorado
Purifics Photo-cat technology
700 gpm
TCE / DEC and 1,4-Dx co-contaminated site
Influent ~ 100 µg/L Effluent 0.3 µg/L 1,4-Dx (DW treatment goal)
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PerfluorinatedCompounds
Stain resisting compounds (Scotchgard)
Non-stick cookware (Teflon manufacturing process)
Firefighting foams for airfields
Between 2000 and 2002, PFOS was voluntarily phased out of production in the U.S. by its primary manufacturer.
In 2006, 8 major companies voluntarily phased out global production of PFOA and PFOA-related chemicals.
There are a limited number of ongoing uses
Linked to developmental effects (e.g., low birth weight, accelerated puberty, skeletal variations), cancer, liver effects, immune effects (e.g., antibody production and immunity), and thyroid effects.
Source: EPA PFOA/PFOS Fact sheet, 2016
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Perfluoroalkyl Acids (PFAAs)
Perfluorocarboxylic Acids (PFCA)
Perfluorosulfonic Acids (PFSA)
e.g., Perfluorooctanoic acid (PFOA)
e.g., Perfluorooctane sulfonate (PFOS)
• Short Chain vs Long Chain (> 7, 8 C)• Affects treatment, fate
Perfluorobutanoic acid (PFBA): 4 monthsPFOA/PFOS: 8.8/5.4 years
Source: Dudley, L., Masters Thesis, 2012
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▪ On May 19th, 2016 USEPA released its final HA for PFOA & PFOS
▪ HAs are not enforceable and non-regulatory.
EPA Health Advisory
PFAA Drinking Water Health Advisory
PFOA 70 ng/L
PFOS 70 ng/L
PFOA + PFOS 70 ng/L
Source: EPA Fact Sheet on PFOA & PFOS Drinking Water Health Advisories, May 2016
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PFAA in Local Press
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Example of PFOA/PFOS Treatment
Source: City of Oakdale, MNHohenstein, G., “Overview of Remediation Technologies”, Emerging Contaminants Summit, Denver 2016
PFOS better adsorbed than PFOA
System designed for 2,500 gpm
Data is prior to new EPA HA
More frequent change-out will be required.
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In Closing
The sky is not falling…
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OBG PRESENTS:OBG | THERE’S A WAY
Questions?Thank you!