Anne Lørup Arildsen og Luca Vezzaro...ækvivalent for fosfor Anne Lørup Arildsen og Luca Vezzaro...
Transcript of Anne Lørup Arildsen og Luca Vezzaro...ækvivalent for fosfor Anne Lørup Arildsen og Luca Vezzaro...
DTU Environment
Revurdering af person ækvivalent for fosfor
Anne Lørup Arildsen og Luca Vezzaro
Opgørelse af fosforindholdet i dansk husholdningsspildevand i årene
fra 1990 til 2017
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Hvem er vi?
• Anne Lørup Arildsen
• Forskningsassistent (arbejder nu hos
HOFOR)
• Har gjort størstedelen af arbejdet
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• Luca Vezzaro
• Lektor i modellering af urbane vandsystemer
(særlig fokus om vandkvalitet)
migRegnbetingedeudløb (live)
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Outline
• Formålet af projekt
• Metoden og datagrundlag
• Resultater
• Konklusioner og anbefalinger
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Objective of the project
• Phosphorous (P) reference value
(P/Person Equivalent)
– Expressed as kgP/PE/yr
• Used to estimate P loads from different
point source. For example:
– Diffuse, low density settlements
(spredt bebyggelse)
– WWTP discharges (if no direct
measurements are available)
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Distribution of P load from different point sources in 2017 (source:
Miljøstyrelsen, 2019)
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Objective of the project
• P reference value estimated back in 1990
• New legislation on P content in detergents
– EU regulation 648/2004 and 259/2012
– Valid from 2013 (laundry) and 2017 (dishwashers)
• Measurements from WWTP inlets in different countries
show a decrease in P concentrations
• What is the current P/PE in Denmark?
• What was the temporal evolution of the P load
throughout the last decades?
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Daily P/PE load for different WWTP in Gotheborg (Tumlin & Mattson,
2013)
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Methodologyprocedure for each plant
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New reference
value for P/PE Measured data
Sorting of
data
Analysis of
data
distribution
Data
validation
and outlier
removal
Calculation
of annual
reference
value
Repeated across all
the available years
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Data background
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• P load per Person Equivalent
• Data should only represent domestic
wastewater (no industrial contribution)
• Data from 56 wastewater treatment
plants were used
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Measurement distributions
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• Analysis of previous monitoring campaigns suggest that concentrations/loads are log-normally
distributed
Phosphorous BOD5
Cumulative density Cumulative density
We looked at the median value (not average value)
Assumption
confirmed
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Data validation
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• Outliers were removed based on the estimated
log-normal distributions
conc Log(conc)
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Calculation of annual P reference
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• BOD5 reference value: 60 gBOD5/PE/d
• For each measurement
𝑷𝒓𝒆𝒇,𝒊 =(𝑪𝑷,𝒊 ∙ 𝟔𝟎 𝒈𝑩𝑶𝑫𝟓
/𝒅)
𝑪𝑩𝑶𝑫𝟓,𝒊
• Yearly value (median of the year)
• If less than 3 measurements in a year, no value
was estimated
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ResultsAmount of available data
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• Duration of timeseries changed depending of the
plant Full data series (1990-2017) for 39
plants
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ResultsAmount of available data
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• Number of available
data changed from year
to year
More uncertain value
(based only on 3-5 samples)
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Temporal evolution of P loadPlant dependency
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• Three main patterns have been observed in the
plants Constant decrease
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Temporal evolution of P loadPlant dependency
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• Three main patterns have been observed in the
plants Initial increase, and then decrease
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Temporal evolution of P loadPlant dependency
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• Three main patterns have been observed in the
plants Sharp fall after 2006-7
Not possible to categorize the observed pattern according to
the plant characteristics
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Temporal evolution of P loadOverview over all the 56 plants
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Great variations
among plants
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Temporal evolution of P loadOverview over all the 56 plants
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Same figure as before –
only median value
New regulation on
detergents
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What about the big plants?Comparison with data from main Danish WWTP
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Effect of industrial
contribution on
estimation of PE
Similar trend
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Conclusions & Recommendations
• The annual P load per person equivalent has fallen by 34% in the last decade
• The reference value has fallen from 1-1.1 kgP/PE/yr (1990-2005) to 0,72 kgP/PE/yr
(2017)
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• Source control (regulation of P in
detergent) looks effective
• There is the need for a continous
analysis of existing data and re-
estimation of yearly P discharges
?
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Tak for opmærksomhed!
• Kontakt:
• Rapporten kan downloades på:
www.orbit.dtu.dk
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