natural (biological) processes in todays...
TRANSCRIPT
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The Waterharmonica
Natural (biological) processes in todays infrastructure
Thanks toRuud Kampf,Rekel/waterThe Netherlands
Board meeting of the Global Water Research Coalition (GWRC)Singapore29 May 2014
Joost Bunsma, Stowa, The Netherlands
Presentation
Motive
Goal
Design
Waterharmonicas in the Netherlands
Results
Added value
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WFD European Union: Mixing zone
Objective: Meet ecological standards
Mixing zone allows discharge not
to meet quality of receiving water
Problem: Discharge of treated waste
water to receiving small surface
waters
Assignment:
Find an effective mean to meet the EU-standards
Based on Hynes, 1960 The biology of polluted waters
Ecological standardsA physical – chemical
B nutrients
C micro-organisms
D macro-organisms
Influence of wastewaterdischarge
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Emerging problem
(Fresh) water shortageAgriculture
Industry
Drinking water
There is no waste water
Waste water is a ‘new’ source
Reuse is a reason to treat waste water
Motive
Water quality standards
Oxygen: low
Suspended solids: many loose bacteries
Nutrients: relatively high
Biodiversity: low
(Fresh) Water shortage
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Goal (1)
Reduce the effect from SWTP-discharge on especially small receiving waters
Distance from dischargeBased on McKinney,
1962. Microbiology for sanitary engineers.
Biological controlled self-purification
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Waterharmonica
Based on Hynes, 1960 The biology of polluted waters
Bridge betweensewage treatment
and surface water
“engineered self-purification”
The WaterHarmonica
Goal (2)
Natural constructed wetlands betweenwell-treated waste water and usablesurface water
Depending specific situation and purposes
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Natural link in the watercycle
Waterharmonica: the natural link between drinking water and surface water
“watercycle”
Design
Settling ponds / Daphnia ponds
Shallow ditches with aquatic plants
Submerged aquatic plants / Fish spawningarea
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Waterharmonica SoerendonkFish spawning area
Reed ditches
Daphnia ponds
The Buulder Aa
7,500Euro per hectare per year
Range 3,000 - 25,000
higher cost for small size
175,000
Euro per hectare
Range 75,000 - 250,000
extra cost for more natural values,
recreation, water buffering
Investment Management including basic monitoring
Euro 0.05 per m3
Range 0.02 – 0.12
Dutch Waterharmonicas costs
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STOWA reports 2001 - 2005
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STOWA 2013
Stowa 2013-08:
Waterharmonica's in Nederland (1996-2012
realised
soon ready or in preparation
Waterharmonica’sin The Netherlands2014
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Dutch Waterharmonica’s
Aqualân Grou
Three Daphnia ponds
Spawning area for fishFour reed ditches
effluent
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Kristalbad
Land reformation plan ca. 40 ha
Project cost € 5.055.772
Innovation subsidy € 2.527.886
Into operation 2013Four functions integrated in one area
1. Water buffer: 187.000 m3
2. Ecological zone between cities of Enschede and Hengelo
3. Convert effluent into a “ecological sound water”
4. Recreation and nature close to the two cities bronnen:Senter-Novem KRW-innovatie programmahttp://www.berflotribune.nl/images/stories/kristalbad-flyer.pdfn
Kristalbad
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1. Suspendedparticles/solids
2. Pathogens
3. Organic pollution andoxygen
4. Nutrients
5. Buffering peak loads
6. Ecotoxicology
7. Ecology
Results: change of effluent?
Suspended particles / solids
Paradox: activated sludge from SWTP is converted
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Reduction of pathogens in SWTP and Waterharmonica
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
E. coli Enterococci C. perfringens Bacteroides-fagen (PFU)
Log 1
0K
VE
10
0m
L-1
RWZI in RWZI uit / Moeras in Moeras uit
Bathing
water
WWTP in WWTP out Waterharmonica Out
Pathogens
The Waterharmonica is very effective in reducing peak pollutions of eg. a sludge overflow:
• Both Suspended Solids (90%) as P (90%) and N (60-70%)
Buffering peak loads
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Nutrient removal”nature takes it all”
Nitrogen
Removal 800 – 2000 kg N/ha.yearThus at high load only 20 % removal
At loads below 2000 kg N/ha.year up to 70 – 80 % removal
Especially with high quality effluents: Ntot < 2 mg/l
Phosphorus
Removal limited, below 200 kg P/ha.yearThough, at low load combined with low concentrations very low P-concentrations, below 0.02 mg P/l
Ecotoxicology
Effluent from STP can have an inhibiting effect on algae development
WFD innovation project WIPE showed:
• Waterharmonica has a favourable effect on the toxicological quality of the water in the outlet (possible by adsorption, degradation or smoothingpeaks)
No indications of risks of acute toxicity
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EcologyIncrease of ecological diversity
Increase of Daphnia
Decrease of monocultural bacteria of activated sludge
Increase of vegetation
Increase of number and variation of birds and fish
Added value
‘Nature’
Peak reduction
Awareness
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CultureHeritage
EstheticsExperience
Meet
Thanks to Oscar van Zanten, De Dommel
Experience Water
Waterharmonica Soerendonk
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Conclusions
An established concept, a way of thinking
Obtained a place in Dutch national policy plans
Research and monitoring
Experience is growing
Clear water by nature
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Conclusions
New concepts
- ecosystem services: delivering not only a sound water but also nature, recreation, etc
- not only reuse of water but recovery of nutrients biomass production
Added value
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