David Gustavsson Research L eader Status for sirkulær økonomi i avløpsbransjen Oslo Nov 13 2019 Urban WWT of today centralised Urban WWT of today centralised Balmér 2010 and Lingsten ID: 809334
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Slide1
Hvordan forbedre avløpsrensing i urbane områder og samtidig oppnå økt gjenbruk av plantenæringsemner?
David GustavssonResearch Leader
Status
for sirkulær økonomi i
avløpsbransjen, Oslo, Nov 13, 2019
Slide2Urban WWT of today = centralised
Slide3Urban WWT of today = centralised
Balmér
(2010) and Lingsten
et al
. (2011)
”
Centralised
is
economically
favorable
”
”
Centralised
is
efficient
”
Slide4WWTPs´ responsibilities
are increasing
A WWTP´s most important tasks are to receive and treat
the wastewater and handle the residues
of the treatment.
Slide5WWTPs´ responsibilities
are increasing
However, the treatment should alsoenable reuse and recovery
of the contents in wastewater,have low inputs of energy and resources, andnot contribute to global heating
and other environmental impacts.Furthermore, existing WWTPs struggle withmore stringent and new discharge limits,increased load, andsurrounding buildings are moving closer.
Slide6Centralised
wastewater treatment
Conventional
Future with bio-P
Future w/o bio-PImprovements needed:Better effluent barrier (treatment)Increased biogas production (recovery)More compact solution (surroundings)Lower inputs of energyIncreased nutrient recovery
Slide7Centralised
wastewater treatment
Conventional
Future with bio-P
Future w/o bio-PIncreased biogas productionCompact solutionBetter effluent barrierIncreased nutrient recoveryLow input of energy
Slide8Centralised wastewater
treatmentConventional
Future with bio-P
Future w/o bio-P
Slide9Plant nutrient
recovery - conventional
Data
collected
from Jönsson (2019)
Slide10Plant nutrient recovery – future with bio-P
Slide11Plant nutrient
recovery – w/o bio-P
Slide12Slide13Sludge disposal methods – simple comparison
Wittgren
et al.
(2017)
Slide14Are we locked into our urban centralised system?
Slide15How to improve the system further?
30-50%
Slide16”Sustainable” cities
Winner
of
Nordic
Built Cities Challenges 2016 – Sege ParkSharing for Affordable and Climate Smart
Living
Slide17Urine separation
<20%
80%
Slide18Main challenges urine separation
Lack of attractive and comfortable urine separation toilets with low maintenance needs,Space efficient, local solutionsLow energy methods for volume reduction for minimising the transports to agriculture
Slide19New toilet
coming and urine drying optimisation is ongoing
Slide20Simha
et al
. (2020)
Slide21Main argument for urine separation
Decreased need of upgrading and decreased operational costs at existing centralised WWTP.Increased nutrient recovery from human excreta.
Decreased water use/decreased climate impact of wastewater handling system.
Slide22Assimilation
EPA (2010)
Slide23Effect of
urine collection – N removal
Wilsenach
& van
Loosdrecht (2004)
Slide24Effect
of urine collection – P
removal
Gustavsson H. (2019)
Stored P by PAO (A) and total recovered PO4
3-
(B) at different %
of
urine
separation in the WWTP
catchment
A
B
Slide25Energy comparison
A – Conventional treatment
B – Separate COD and N removal (
anammox)C – Urine nutrient recovery (1/2 = with/without embedded fertiliser energy)
Only aeration and electricity production from sludge.Today´s standard for electricity production.Larsen (2015)
Slide26Urine scenarios are
performing well in LCAs
Spångberg
et al
. (2014)
Slide27Sustainability strategy
(2015) for the housing area Sege Park in Malmö
”Sege Park is an experimental workshop for sustainability””Sege Park shall be a test bed for urine separation.”…”The aim is that at least one building is included in the
study…”
Slide28Uricycle - vision
We will
put forward a new urine separation system, which
enables the creation
of new dry fertilisers, which can decreasethe dependency of import of mineral fertilisers to secure aresilient food supply.
Slide29How to determine best way of sludge disposal and nutrient recovery?
Perform system analyses including substance flow analyses, LCA, sustainability (ecological, economical and social) and LCC.
However, which is the best functional unit?
Slide30Svenska Innovationsplattformen för återvinning av näringsämnen
Slide31So… Hvordan forbedre avløpsrensing i urbane områder og samtidig oppnå økt gjenbruk av plantenæringsemner?
The WWTPs of tomorrow have better barriers, are compact, lower input of energy and recover more energy and plant nutrients.Urine separation makes the WWTPs even more efficient and substantially increases the recovery of plant nutrients in the urban system
.System analyses are important tools.
Slide32Thank you for
your attention!Contact details
david.gustavsson@vasyd.se+46 738 53 01 50@DrKolfot