Pharmaceuticals in waters
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Transcript of Pharmaceuticals in waters
Water Consulting Services
Pharmaceuticals in watersNiina Vieno
Niina Vieno
Over 3000 chemicals are used in human and veterinary medicine
• Sources in the environment:
• Wastewater treatment plants• Via human urine and feces (sewage)
• Via disposal of old pharmaceuticals (in Finland 29 000 kg)
• Hospitals
• Pharmaceutical industry
• Solid waste• For example, in Finland 32 000 kg of
pharmaceuticals are incorrectly disposed via solid waste and end up in landfills
Niina Vieno
Harmful effects in the environment have been proven
1 μg/l of diclofenac and propranolol induced:
• Reduced growth• Reduced ability to attach to the underlying substrate• Bioconcentration into the mussel
Source: Ericson et al. 2010, Aquat Toxicol. 99(2):223-31
Baltic Sea blue mussel
Photo: www.blueoceans.org
Unpublished data ofBlue Mussels in the Gulfof Finland:
• Low concentrations(< 10 ng/l) ofpharmaceuticals inducestress in blue mussel.
Niina Vieno
Zebrafish embryos:
30 ng/l concentration of diclofenac at 90-minute exposure has inducedoxidative stress
reduced ability to detoxify the reactive intermediates or to repair the resulting damage
Photos: ehsc.oregonstate.edu & www.landesbioscience.com
Source: Feito et al. 2012 Ecotoxicology. 21(1):289-96
Niina Vieno
Wild European perch:
Antidepressant oxazepam has been noted to alter behavior and feeding rate of at concentrations measured in effluent-influenced surface waters.
Source: Brodin et al. 2013, Science 339, 814-815
Niina Vieno
Pharmaceuticals bioconcentrate in fish
• Fish were caught from a Finnish lake that receives treated municipal wastewater via a small river.
• Diclofenac, ibuprofen and naproxen were detected in bile samples of nearly all the fish
• Concentrations in the lake were up to 300 ng/l (diclofenac)
Source: Brozinski et al. 2013, ES&T47, 342-348
Niina Vieno
17α-ethinylestradiol (EE2) is an endocrine disruptor: there are effects already at a concentration of 0.1 ng/l
Fathead minnow:
• LOEC= 1 ng/l for:• plasma vitellogenin induction (measures
estrogenic sensitivity) in both sexes• ultrastructural changes in the testes and
livers
• LOEC= 0.1 ng/l for:• significant increase in the mean number of
eggs spawned per pair
Source: Pawlowski et al. 2004. Ecotoxicol Environ Saf. 2004, (3):330-45.
Niina Vieno
EU’s environmental legislation will consider pharmaceuticals for the first
time ever in the revised Water Framework Directive
Niina Vieno
LIST OFPRIORITY
SUBSTANCESAND
PRIORITY HAZARDOUS SUBSTANCES
Use of these compounds should be reduced or banned.
Water Framework Directive (2000/60/EC)
WATCH LIST OF EMERGING
POLLUTANTS
CURRENT SITUATIONPROPOSAL (alongside
the list of priority substances
These compounds should be monitored-> can be classified as priority substance
Niina Vieno
Pharmaceuticals and hormones proposed to be added in the watch
list
Inclusion isconfirmed!
Niina Vieno
Pharmaceuticals in the “watch list” means that member states shall:
• monitore them in surface waters and report to European Commission (mandatory)
• monitore them in wastewater effluents (voluntary)
Niina Vieno
Classification of pharmaceuticals as HELCOM Core indicators
• Diclofenac and EE2 has been suggested
• Discussion also about addition of natural estrogens (E1, E2 and E3) and possibly complemented with an in vitro yeast assay.
Niina Vieno
Occurrence of pharmaceuticals in wastewater depends on the
consumption
Spai
n
Austri
a
Austra
lia
Japa
n
Germ
any
USA
Finl
and
0100200300400500600700800900
1000
Diclofenac
Con
sum
pti
on
mg
/in
h/y
ear
Spai
n
Austri
a
Austra
lia
Japa
n
Germ
any
USA
Finl
and
02000400060008000
1000012000140001600018000200002200024000
Ibuprofen
Con
sum
pti
on
mg
/in
h/y
ear
Dnf Dnf
Dnf= data not found
Niina Vieno
…next important thing is human metabolism
Carba
maz
epin
e
Ibup
rofe
n
Diclof
enac
Met
opro
lol
Keto
prof
en
Napro
xen
Sulfa
met
hoxa
zole
Norflo
xacin
Cipro
floxa
cin
Acebu
tolo
l
Bezafi
brat
e
Sota
lol
Ofloxa
cin
Ateno
lol
0%10%20%30%40%50%60%70%80%90%
100%
Excreted as parent compound
Niina Vieno
Diclofenac-1--o-acyl glucuronide (DCF-G)
4´-hydroxy-diclofenac (4´-OH-DCF)
5-hydroxy-diclofenac (5-OH-DCF)
Diclofenac (DCF)
3´-hydroxy-diclofenac(3´-OH-DCF)
4´,5-dihydroxy-diclofenac(4´,5-OH-DCF)
R, R´, R´´= not definitely identified ligands, presumably one per molecule
About 1 % is excreted unchanged
About 11 % is excreted conjugated
36 % 10%
Niina Vieno
Sewage concentrations follow consumption pattern
0100200300400500600700800900
1000
Diclofenac con-sumption
Con
sum
pti
on m
g/i
nh
/year
Spai
n
Austri
a
Austra
lia
Japa
n
Germ
any
USA
Finl
and
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
Diclofenac, max influent concentration
Co
nce
ntr
ati
on
, g
/l
Dnf Dnf Dnf Dnf
Dnf= data not found
Niina Vieno
Spai
n
Austri
a
Austra
lia
Japa
n
Germ
any
USA
Finl
and
02000400060008000
1000012000140001600018000200002200024000
Ibuprofen
Con
sum
pti
on
mg
/in
h/y
ear
Spain
Austri
a
Austra
lia
Japa
n
Germ
any
USA
Finland
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
Ibuprofen, influent concentration
Conce
ntr
ati
on,
g
/l
Niina Vieno
Sewage concentrations can easily be estimated by calculations
A= consumption of a pharmaceutical (as grams per inhabitant per year)P= number of inhabitants serviced by the sewage treatment plante%= the percentage of pharmaceuticals excreted unmetabolizedQ= influent flow rate of the sewage treatment plant (m3/d)
Concentration of a pharmaceutical in influent ofa sewage treatment plant in g/l:
Niina Vieno
Carba
maz
e...
Diclof
enac
Met
opro
lol
Keto
prof
en
Napro
xen
Norflo
xacin
Cipro
floxa
cin
Acebu
tolo
l
Bezafi
brat
e
Sota
lol
Ofloxa
cin
Ateno
lol
0.0
1.0
2.0
3.0
4.0
5.0
6.0 Calculated
Measured
Se
wa
ge
co
nce
ntr
ati
on
, g
/l
Calculated values are often lower because deconjugation is not considered in the equation.
10 % excreted unchanged60 % excreted as glucuronides
10 % excreted unchanged70 % excreted as glucuronides
Niina Vieno
Concentrations in Finnish sewage (n= 13-21)
Ofloxa
cin
Norflo
xacin
Acebu
tolo
l
Carba
maz
epin
e
Diclof
enac
Cipro
floxa
cin
Ateno
lol
Sota
lol
Bezafi
brat
e
Met
opro
lol
Keto
prof
en0
0.5
1
1.5
2
2.5
Co
nce
ntr
ati
on
, g
/l
Niina Vieno
Concentrations in Finnish sewage
Naproxen Ibuprofen0
2
4
6
8
10
12
14
16
18C
on
ce
ntr
ati
on
, g
/l
Niina Vieno
In comparison: Black wastewater
PAR TRI TC MET DOX PRO CBZ CET IBP DCF
g/L
0
50
100
150
200
250
300BW UASB PN AMX
>1000 g/L
DOX PRO CBZ CET
g/L
0
1
2
3
4
5
6
7BW= Black waterUASB= Upflow Anaerobic Sludge
BlanketPN= Partial nitritationAMX= Anammox
PAR= paracetamolTRI= trimethoprimTC= tetracyclineMET= metoprololDOX= doxycyclinePRO= propranololCBZ= carbamazepineCET= cetirizineIBP= ibuprofenDCF= diclofenac
Source: De Graaff et al. 2011. Water Research, 45(1), 375-383.
Niina Vieno
Elimination in wastewater treatment
• In conventional treatment plants, elimination of pharmaceuticals from the water phase occurs:
• Via sorption to sludge
• Via biodegradation/biotransformation
• Compounds do not evaporate
Niina Vieno
Sorption= Absorption + Adsorption
SLUDGE FLOC
CELL
Hydrophobic compound Hydrophilic, ionic, compound
Absorption Adsorption- desorption
SLUDGE FLOC
CELL
Niina Vieno
Sorption can be estimated by Kd value
• Sorption of a compound to sludge can be considered negligible when
• Kd value is < 500 L/kgSS (i.e. logKd < 2.7)
Niina Vieno
logKd (primary sludge) logKd (activated sludge)
Ciprofloxacin 4.3
Norfloxacin 4.2
Sulfamethoxazole 2.05 – 2.6
Carbamazepine < 1.3 0.09
Diclofenac 2.3 – 2.7 1.2 – 2.1
Ibuprofen <1.3 0.85
Naproxen 2.34
Atenolol 1.6
Metoprolol 0.5
Sotalol 1.6
Niina Vieno
Biodegradation: direct- or cometabolism
• Direct metabolisation= bacteria use the
compound as their primary carbon source
• Cometabolisation= bacteria break down or
partially convert the compound but do not
use it as the primary carbon source
Niina Vieno
Pharmaceuticals are primarily degraded cometabolically
• Bacteria secrete enzymes to break down
large organic molecules into monomers
that are small enough to be ingested.
• The enzymes have the potential to degrade
or to transform small organic pollutant
molecules present in wastewater.
Niina Vieno
• E Coli secrete -glucuronidase enzyme
• It is capable to deconjugate the -glucuronated pharmaceuticals excreted by the human body.
• Ammonia monooxygenase (AMO) is secreted by autotrophic ammonia oxidizing bacteria during the oxidation of ammonium to hydroxylamine in aerobic nitrification.
Niina Vieno
Deconjugation of diclofenac b-O-acyl glucuronide can occur in wastewater
treatment plant
• In microbiological degradation tests:
• DCF-G has been noted to deconjugate to form equimolar DCF within 7 d of incubation.
• Reaction rate constant were 0.28 d-1 in the inoculum and 0.12 d-1 under sterile conditions.
• This suggests that abiotic hydrolysis occurs but the reaction is enhanced by micro-organisms.
Source: Lee et al. 2012, Chemosphere, 87, 969-974
Niina Vieno
Biodegradation varies greatly between pharmaceuticals
• Ibuprofen is highly biodegradable at any process configurations
• Diclofenac and carbamazepine are hardly biodegradable
• Suggestions that process parameters such as increase of solids retention time or applying membrane bioreactor could enhance biodegradation.
Niina Vieno
Example for diclofenac
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Conventional activated sludge Activated sludge with biological nutrient removal Membrane bioreactor
35 %
29%
54%
Niina Vieno
Pharmaceuticals degrade to metabolites and complete
mineralization is rare
DICLOFENAC
Niina Vieno
Removal rates are often calculated from influent and effluent
concentrations
• In Finnish sewage treatment plants
Compound Removal rate (%)
Ciprofloxacin 84 %
Carbamazepine -121 %
Diclofenac 17 %
Ibuprofen 95 %
Ketoprofen 81 %
Naproxen 91 %
Atenolol 60 %
Metoprolol 17 %
Niina Vieno
Example of mass flow analysis of diclofenac in Finland
PRETREATMENT ACTIVATEDSLUDGE
324 kg 305 kg
19 kg (6 %)
270 kg (83 %)
4 kg (1 %)
31 kg (10 %)
Sludge Sludge
Biodegradation or-transformation
ENVIRONMENTYearlydischarge tosewer ca. 60 mg/inh
Evaporation
0 %
Niina Vieno
Elimination can be enhanced by tertiary treatment
• Oxidation techniques• Ozonation, O3/UVA/TiO2
• Fenton treatment
• UV based technologies
• Catalytical techniques• Nanocatalysts• Photoelectrocatalysis
• Adsorption and filtration techniques• Sand filtration• Ultra and nanofiltration• Reverse and forward osmosis• Innovative sorbents
• Other techniques• Electrochemical incineration• Sonolysis and ultrasound• Irradiation techniques• Liquid-core microcapsules
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Niina Vieno
Formation of oxidation products needs to be considered
DICLOFENAC DICLOFENAC-2,5-IMINOQUINONE
Rate constant with O3 is about 5 % of that of diclofenac
Reaction with O3
Source: Sein et al. 2008, ES&T, 42, 6656-6662
Niina Vieno
Removal from aqueous phase is usually incomplete and pharmaceutical residues
remain in the effluentsTreated wastewater from Finnish WWTPs (n= 13-21)
Ofloxa
cin
Norflo
xacin
Acebu
tolo
l
Carba
maz
epin
e
Diclof
enac
Cipro
floxa
cin
Ateno
lol
Sota
lol
Bezafi
brat
e
Met
opro
lol
Keto
prof
en
Napro
xen
Ibup
rofe
n0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Co
nce
ntr
ati
on
, g
/l
Niina Vieno
In comparison: Antibiotic ciprofloxacin in treated wastewater
in India
Finland: Max 0.13 g/l (i.e. 0.00013 mg/l)
Patancheru/ India: 31 000 g/l (i.e. 31 mg/l)
Defined daily dose for ciprofloxacin is 500–1000 mg.
Niina Vieno 42
Rivers carry a significant load of the
pharmaceutical residues
River Aura empties into the Baltic Sea at Turku, Finland.
Example: River Aura
Distance from Aura WWTP (km)
c (ng/l)
Niina Vieno
Concentrations in Finnish rivers (n= 64)
Ofloxa
cin
Norflo
xacin
Acebu
tolo
l
Carba
maz
epin
e
Diclof
enac
Cipro
floxa
cin
Ateno
lol
Sota
lol
Bezafi
brat
e
Met
opro
lol
Keto
prof
en
Napro
xen
Ibup
rofe
n0
10
20
30
40
50
60
Co
nce
ntr
ati
on
, n
g/l
Niina Vieno
Marine environment is
the final sink for pharmaceuticals
Photo: www.helcom.fi
Niina Vieno
Source: E-PRTR (European Pollutant and Transfer Register)
-> Waste and waste water management
Niina Vieno
Measurement data in the Baltic Sea is scarce
Compound Therapeutic use
Max concentrations as ng/l
Germany
Stockholm
Helsinki
Bezafibrate Lipid regulator 0.3
Carbamazepine Antiepileptic 6.8 Detected
Clofibric acid Metabolite of fibrates (lipid regulators)
0.4
Diclofenac Anti-inflammatory
0.4 Detected
Gemfibrozil Lipid regulator 0.1
Ibuprofen Anti-inflammatory
0.1 Detected
Naproxen Anti-inflammatory
0.5 Detected
Oxazepam Antidepressive 20
Propyphenazone Analgesic 0.2
Niina Vieno
EE2 (i.e. 17α-ethinylestradiol) is the most potent out of estrogens
Source: Hazardous Substances in the Baltic Sea. Baltic Sea Environment Proceedings No. 120 B. Available at: www.helcom.fi
EE2: 2.1– 17.9 ng/l
EE2: Up to 14.1 ng/l
EE2: Up to 3.9 ng/l
EE2: 1.6–3.0 ng/l
EE2: 1.7–3.2 ng/l
Niina Vieno
Most problematic are those pharmaceuticals that are not eliminated in the WWTP or in the
environmentIBUPROFEN
Breaks down easilyby biotransformation
Only a small fraction entersthe environment
CARBAMAZEPINE
Is persistent in wastewater treatment
Is persistent in the environmentand is detected also in ground w.aters
Niina Vieno
Whose responsibility it is
to reduce the environmental
load of pharmaceuticals?
PHARMACEU-TICAL
INDUSTRY
WASTEWATER
TREATMENT PLANTS
EVERYONETOGETHER!
AUTHORITIES
DOCTORS &CONSUMERS