national research program on the effects of underground thermal energy storage (utes) - use of the...
TRANSCRIPT
National research program on the effects of Underground
Thermal Energy Storage (UTES)
- use of the subsoil in a sustainable way -
Benno Drijver – IF24 september 2010
Content
1) UTES– Why UTES?– What is UTES?– Application in the Netherlands
2) Research program– Organization– Approach– First results
3) Conclusion
1) UTES – Why UTES?
• Fossil fuels are finite
• Security of energy supply (reduce dependence on fossil fuels)
• Reduce global warming
Urgent need to reduce the use of fossil fuels
Trias Energetica:I. Reduce energy demand (energy-saving)II. Use renewable sources instead of fossil fuelsIII. Use the most efficient techniques to produce/use energy
UTES saves energy (and energy costs)
1) UTES – What is UTES?
TES = thermal energy storage UTES = using the underground for TES
TES using ice has been used for hundreds of years
1) UTES UTES – What is UTES?
What is UTES?
Aquifer TES (ATES): Open loop systemsGroundwater is extracted from and infiltrated in the aquifer
Borehole TES (BTES):Closed loop systems
1) UTES – What is UTES?
ATES – Types Doublet
Monowell Recirculation
1) UTES – Application in the Netherlands
• ATES permits in the Netherlands: 1990, 2000, 2009
1) UTES – Application in the Netherlands
Growth ofATES and BTES in theNetherlands
Applications of ATES in the Netherlands
2) Research program – Why a research program?
• Government wishes to stimulate UTES
(less stringent regulations, faster permit procedures, etc.)
• Growth has to take place in a sustainable way Research on the remaining concerns
- Impact on groundwater chemistry and microbiology - Interference between UTES systems- Claim on subsurface space- Perforation of protecting clay layers- Potential leakage of fluids from BTES-systems
Investigating opportunities: combination conceptsUTES/Remediation and UTES/other concepts in the watercycle
2) Research program – Organization
Research parties
Specialist in (bio)remediationCombination UTES – remediation
Research institute on the subsurfaceGeohydrology, geochemistry, remediation
Consultant specialized in UTES> 20 years of experience
Fundamental researchUTES, remediation, microbiology
2) Research program – Organization
Made possible by our participants
– Foundation for Knowledge Development and Disseminiation on Soil (SKB)
– National government (ministries of Economic Affairs and of Housing, Spatial Planning and Environment)
– All 12 provinces
– Municipalities (Almelo, Amersfoort, Apeldoorn, Den Bosch, Deventer, Haarlem, Hengelo, Tilburg, Utrecht, Zwolle)
– Water boards (Groot-Salland, Regge en Dinkel)
– Drinking water companies/organizations (Brabant Water, Vitens, VEWIN)
– Agency NL, Arcadis, Essent (Energy company), Port of Rotterdam, Dutch association for UTES (NVOE), Dutch horticultural association (PT), Dutch Railways Foundation for Soil Remediation (SBNS), Rendo
2) Research program – Approach
Literature review
Direct impact ATES:(hydrological, thermal)
Indirect impact ATES(compaction, chemistry, microbiology)
BTES (anti-freeze liquids)
Combination concepts (UTES – remediation/other concepts)
2) Research program – Approach
Field measurements at 9 UTES-projects
Different types of UTES systems: BTES, different ATES types, high temp., contaminated sites
Relatively old projects (long term impact) Availability of a reference well Existing data set Different geochemical (redox) conditions Temperature difference > 2 °C Geographical distribution
1x 3x 1x 1x 2x
2) Research program – Approach
Field measurements at 9 UTES-projects
Clean sites: 3 monitoring wells (warm zone, cold zone, reference well)
Contaminated sites: 5 monitoring wells
Parameters: Physical - hydraulic head, temperature, EC, pH Chemical - main and trace elements, redox parameters,
pollutants, nutrients, substrates Microbiological - numbers, diversity, species, functional
groups, pathogens, remediating species
2) Research program – Approach
Laboratory experiments
Step 1: Batch experiments to investigate mobilisation of organic matter from aquifer sediment. Static and dynamic (shaken) tests at 10, 20, 30, 50 ºC.
Step 2: Batch experiments on bioremediation at different temperatures (with and without stimulation) to investigatie the influence of temperature on remediation kinetics.
Step 3: Column experiments to investigate the influence of flow velocity on bioremediation kinetics.
2) Research program – First results
Geochemistry – Results from literature review
Conclusions impact of temperature on main elements seems insignificant below 25 ºC > 40 ºC precipitation of carbonates can occur > 45 ºC fulvic acids are mobilized from organic matter in aquifer sediments
Little research was found on: The impact on trace elements The impact of (vertical) mixing
2) Research program – First results
Microbiology – Results from literature review
Conclusions Microbiologic growth is limited by the amount of assimilible organic carbon =>
Limited temperature increases seldom lead to microbial growth Organic matter mobilized at high temperatures might stimulate microbial
growth Temperature changes can cause shifts in the composition of the microbiologic
population to species that are adapted to these temperatures Pathogens are not expected to grow in aquifers used for UTES
Little research was found on: The impact on functional groups (e.g. denitrifiers, sulfate reducers) The impact on microbial diversity
2) Research program – First results
Laboratory experiments
Step 1 (Static and dynamic (shaken) batch experiments at 10, 20, 30, 50 ºC) is finished
Conclusions: -Temperatures up to 30 ºC do not
influence COD;- Increasing temperature to 50 ºC
leads to elevated COD levels;
This indicates mobilisation of organic matter between 30 and 50 ºC
0,00
50,00
100,00
150,00
200,00
250,00
300,00
10 20 30 50
CZ
V ,
amm
oniu
m (
mg/
l)
Organisch stof (6,3%)
Statisch CZV (gefiltreerd) Statisch ammonium
Dynamisch CZV (gefiltreerd) Dynamisch ammonium
2) Research program – First results
Interference
Projected interference risk: growth to 2250 ATES systems
The Hague
Amersfoort
Amsterdam
2) Research program – First results
Interference: Factors influencing interference
Calculated temperatures after 20 years of ATES:
Energy balance Large energy imbalance
2) Research program – First results
Interference: Factors influencing interferenceHydrological impact ATES (well configuration)
Extraction without re-injection (I) Extraction with re-injection (ATES – A,B,C)
B C
A
A
I
3) Conclusion
Questions that lawmakers have to deal with are:
- To what extent should other groundwater users (e.g. drinking water companies) be protected against UTES?
- Should high temperature storage be allowed and under which conditions?
- Which monitoring prescriptions should be demanded in permits?
- What requirements should be made to reduce the risk of leakage of fluids from BTES systems and limit the consequences?
- Is legislation necessary to minimize interference? (how bad is interference?)
Goal of the research program (2009- end of 2011):
- Provide scientific information on the effects of UTES
- This information must help lawmakers to develop new legislation
www.meermetbodemenergie.nl
Thank you for your attention