Tecnologie specifiche di rimozione di prioritari ed ...€¦ · Tecnologie specifiche di rimozione...
Transcript of Tecnologie specifiche di rimozione di prioritari ed ...€¦ · Tecnologie specifiche di rimozione...
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Tecnologie specifiche di rimozione di prioritari ed emergenti da acque reflue
e potabili
Paola Verlicchi, PhD
Testimonianze, soluzioni e prospettive
Milano, 11-12 giugno 2018
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MICROcontaminants of interest• Pharmaceuticals, personal care products
• Endocrine disrupting compounds,
• Flame retardants
• Surfactants
• Pesticides
• Industrial additives
• Microplastics
They can affect water quality and potentially affect drinking water supply, ecosystem and human health.Still unknown their potential long-term effects in water compartments
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What about Emerging contaminants?
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Removal pathways/strategies
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A glimpse to Biological Processes-Advances and challanges
Treatment process
Advantages Challenges references
Activatedsludge
Lower capital and investmentcosts than AOPsEnvironmental friendly
Low removals for beta-blockersSludge containing ECs
Verlicchi et al., STOTEN 2012
Microalgaereactor
Resource recovery of algalbiomass (= fertilizer).High quality effluent and no acute toxicity risk associatedwith ECs
Removal efficiencies affected by coldseasons.EDCs cannot properly degrade
Matamoros et al., HazMat2015
Constructedwetlands
Low energy demand and lowO&M.High removal of estrogens, PCPs, pesticides and pathogens
Risk of clogging.Removals affected by cold seasons.High footprint
Verlicchi et al., STOTEN 2014
MBR Small footprintEffective for removal of biorecalcitrant compounds
Higher O&M costs (energyconsumption, membrane fouling, control system…)Removal efficiencies depends on the specific compounds
Verlicchi et al., STOTEN 2012; Sim et al 2010
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A glimpse to Chemical Processes-Advances and challanges
Treatment process
Advantages Challenges references
Coagulation Reduction of the turbidity.Increased sedimentation rate throughsuspended solid particle formation
Low removal of Ecs.Large amount of sludge.Addition of coagulants
Verlicchi et al., STOTEN2012
Ozonation Strong affinity with ECs in presence of H2O2
Disinfection and sterilizing effects
High energy demand, generation of oxidative by-products (undesired).Interference of radical scavangers
Kanakarajuet al., JEME2018
AOPs Higher removal efficiencies for manyECsShort degardation rate
High energy demand, high O&M costs.Generation of undesired by-products.Interference of radical scavangers.
Kanakarajuet al., JEME2018
Fenton and photo-Fenton
Degradation and mineralization of ECs Decrease of OH· forming chloro and sulfato-Fe(III) complexes or due to scavange of OH· forming Cl2
· and SO4·- in presence of chlorine and sulphate ions.
Le Truonget al., WatRes 2004
Photo-catalysis(TiO2)
Degardation of recalcitrantcompoundsHigh reaction rates by using catalystLow price and chemical stability of TiO2 catalist and easier recovery
Dufficulties for large flowrates. Highcosts for UV lamps and electricitySeparation and reuse of photocatalyticparticles from slurry suspension
Kanakarajuet al., JEME2018
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A glimpse to Physical Processes-Advances and challanges
Treatment process
Advantages Challenges references
Micro and ultra-filtration
Pathogen removal Micropollutant removalefficiencies depend on the the pore sizeHigh operation costs
Ahmed et al., HazMat 2017
Nanofiltration Useful for saline water and WWTP effluents
High energy consumption, membrane fouling, disposal issues
Ahmed et al., HazMat 2017
Reverse osmosis
Useful for saline water and WWTP effluentsHigh removal of pharmaceuticals, PCPs and EDCs
High energy consumption, membrane fouling, disposal issues
Ahmed et al., HazMat 2017
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Common Wastewater Treatment
• For the highly polar compounds, e.g. most pharmaceuticals and theircorresponding metabolites, the most important removal route isbiodegradation or mineralization by microorganisms.
• Removal efficiencies depends on the compounds and also on operational conditions.
• The identification of the degradation products is a challenging task asthey are at very low concentrations and in complex matrices which mayinterfere with detection
Pomiès et al., STOTEN 2013
8Ahmed et al., HazMat 2017
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CAS vs. MBR
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CAS MBR
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MBBR –Observed removal efficiencies
• Ibuprofen 94 %
• Naproxen 70-80 %
• Diclofenac 74-85 %
• Clofibric acid 5-28 %
• Ketoprofen 63-73 %
• Carbamazepine 0-1 %
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Fungal enzymatic systems
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• Increasing number of studies, investigations removal capacityof different fungal species in removing trace organiccompounds.
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Just a few words on the process
• The term white-rot fungi (WRF) refers to a collection of fungalspecies able to degrade lignin. They include Trametesversicolor, Irpex lacteus…
• WRF efficiently break down lignin to release the more metabolized carbohydrates hemicellulose and cellulose. Thisis possible due to a combination of extracellular ligninolyticenzymes, organic acids, mediators and accessory enzymes.
13Mir-Tutusaus et al., 2018
Lignin
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Just a few words on the process
• The main characteristic of this enzimatic cocktail is its non-specificity, due to its action via the generation of radicals. This allows the WRT extracellular enzymes capable of transforming a wide spectrum of compounds, including micropollutants
• WRT secrete lignin modifying enzymes (LMEs) and other compoundsfor lignid degradation: Laccase, lignin peroxidase (LiP), manganese peroxidase (MnP) and versatile peroxidase (VP).
• Enzyme production depends on the growth medium and culture conditions.
• In addition WRT also produces CytochromeP450, a superfamily of intracellular heme-containing monooxygenases, which takes part to detoxification of xenobiotics (among them DCF clofibric acid, carbamazepine, ketoprofen) and adaptation to hostile ecologicalniches.
14Mir-Tutusaus et al., 2018
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Bacteria and fungi
• Bacteria generally use micropollutants as growthsubstrates. Difficulties if the contaminants are in lowconcentrations (bacteria cannot colonize them for degrade them. Degradation of micropollutants in WRFis part of a secondary metabolism (cometabolism) asthey require a substrate for their growth.
• Bacteria are generally less versatile when treating a combination of polltants. WRF better suited for theseworking condition.
• Bacteria optimum pH= 7 (tytpical of WWTPs).
WRF optimum pH = 4,5
15Mir-Tutusaus et al., 2018
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Enzymatic degradation –Observed removal efficiencies
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Limitations of WRF
• Need of nutrient addition to guarantee WRF growth
• Immobilization of fungal biomass to avoid growthon the reactor walls and agitators, foaming and increased need of mixing and oxygen supply. Itmay be by pellets or by carriers
• Competition with microorganisms
• Higher HRT.
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Attempts to combine conventional biological process with WRF process.
Mir-Tutusaus et al., 2018
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Comparison
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Ahmed et al., 2017
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Hybrid system=MBR+PAC
• Lab scale experiments
• MBR reactors: 30 L (MF; flat sheet; size 0,45 mm); 185 L (UF; hollow fiber; size 0,045 mm). HRT= 24 h.
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0 87 122 157 192P1 P2 P3 P4
35 d 35 d 35 d
dperiodAddition of PAC at
Biomass analysis: biomassagglomerates not influenced by PAC addition.Size: 42 mm (UF), 77 mm (MF).Poorer settleability in UF-MBR, butimproved by PAC addition.Good filterability in all the periods
PAC increases the strength of the floc structure, allows the formation of a biofilm around it and favorthe development of some Protozoans able to improve effluent quality and amoebas (able to enhancenitrogen removal)
Alvarino et al., JEMA 2017
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Hybrid system=MBR+PAC
20Alvarino et al., JEMA 2017P1= no PAC addedPAC addition = 250 mg PAC/L
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Hybrid system=MBR+PAC
21Alvarino et al., JEMA 2017
Ultrafiltration membranes
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Hybrid system=MBR+PACAnalysis of the removal pathways
22Alvarino et al., JEMA 2017
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Hybrid system=MBR+PACAnalysis of the removal pathways
• CBZ: improvement after PAC addition, no influence of the membrane size
• Hormones, IBU, NPX: no influence of membrane size nor PAC addition in the removal.
23Alvarino et al., JEMA 2017
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Hybrid system=MBR+PACAnalysis of the solid phase
24Alvarino et al., JEMA 2017
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Hybrid system=MBR+PACLessons learned
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- PAC addition was beneficial for membrane fouling prevention
Alvarino et al., JEMA 2017
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Advanced treatment processes
• Which is the level of investigations? Lab, pilot full scale investigations?
• Lessons learned?
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Statistics of publications (2000-2018) on applications of AOPs for pharmaceuticalremoval (Scopus database search for «AOPs» and «pharmaceuticals» in allsubject areas).
Kanakaraju et al., JEMA 2018
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AOPs: current investigations
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Kanakaraju et al., JEMA 2018
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Ozonation
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EMA
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Ozonation
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Ozonation
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Ozonation
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Fenton and photo-Fenton processes
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UV-based processes
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Sonolysis
34Kanakaraju et al., JEMA 2018
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Electrochemical oxidation
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Kanakaraju et al., JEMA 2018
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Radiation
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Kanakaraju et al., JEMA 2018
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Other AOPs
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Lessons learned from AOPs studies
AOPs investigations on pharmaceutical removalgenerally deal with:
• Degradation kinetics by investigating the effect of oprational parameters,
• Mineralization measurements usingmacroparameters such as TOC, DOC, COD
• Toxicity of the effluent
• Profiling or identification of degradants
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Challenges for future AOPs studies
• Identify transformation products and effluenttoxicity levels as transformation products may pose a higher toxicity than the corresponding parentcompounds,
• Test AOPs with real water/wastewater
• Due to presence of a mixture of compounds whoseconcentration may vary, define and choose a reliable AOP protocol to ensure its effectiveness
• Refer to mixture of pharmaceuticals and not to a single compounds
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Hospital effluent: treatment and management
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Verlicchi et al., 2015 STOTEN
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Hospital effluent: treatment and management
41Verlicchi et al., 2015 STOTEN
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Hospital effluent: treatment and management
42Verlicchi et al., 2015 STOTEN
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Hospital effluent: treatment and management
43Verlicchi et al., 2015 STOTEN
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Hospital effluent: treatment and management
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Verlicchi et al., 2015 STOTEN
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Hospital effluent: treatment and management
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Know thy unknowns
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“There are known knowns. These are things we
know that we know. There are known unknowns.
That is to say, there are things that we know we
don't know. But there are also unknown
unknowns. There are things we don't know we
don't know.”
Donald Rumsfeld
There is the need/hope to reduce the unknowns size and enlarge knowns size!
Verlicchi, 2018 PrefaceSpringer’s book
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Grazie per l’attenzione
Paola [email protected] di Ingegneria - UNIFEVia Saragat 1, 44122 Ferrara - Italia