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NextGen Gotland Sweden

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The document summarizes circular water solutions being tested on the island of Gotland, Sweden. The objectives are to harvest rainwater, treat wastewater decentralized using membranes powered by solar energy, reuse treated water, and store water underground and in controlled natural ponds. Sensors have been installed to monitor flows and water levels. Initial tests show water recovery of 78-83% and removal of 88% COD and 90% ammonia from wastewater. While pandemic delays have occurred, the solutions aim to establish a sustainable local water cycle on Gotland and overcome challenges through innovative ideas.

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1 Circular solutions for Water #7 Gotland Sweden Relevant data Relevant sectors Tourist industry Municipal sector Water sector Lead partners Storsudred testbed area: 14 000 ha Habitants during winter: 900 Habitants during summer : 1800 Tourists per year: 300 000

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2 1. Objectives of the NextGen solutions • Rainwater harvesting using automatic floodgates to replenish aquifers and monitoring of aquifer levels • Decentralized membrane treatment of raw wastewater to reduce volumes treated at the central WWTP • Climate efficient wastewater reuse powered by solar energy to overcome carbon footprint drawbacks • Optimized membrane filtration for producing drinkable water from challenging surface water • Storage of water in subsurface dams Water

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3 Technology Evidence Base (TEB) Gotland 1. Objectives of the NextGen solutions Positioning of demo case within the CE

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4 T 1.2.1. Decentralised membrane treatment powered by solar energy 2. New NextGen solutions PRE-FILTRATION COAGULATION AND ULTRAFILTRATION UV SEDIMENTATION SCREEN DISC FILTER ULTRAFILTRATION REVERSE OSMOSIS UASB Annamox PRECIPITATION CHLORINATION UV PRECIPITATION Treatment in the WTP  drinking water Decentralised membrane treatment  regenerated water Sewage water Recovered water Sewage concentrate to external WWTP Solar energy Circular water systems

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5 T 1.2.1. Drainage ditches with IoT for flow and water levels control 2. New NextGen solutions

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6 T 1.2.1. Controlled nautral ponds dams for storage 2. New NextGen solutions Keep the surface level during the summer by an autmatic flood gate Inflow, ditch, hatch Burgsvik village Lake Reclaimed waste water 25 000 m3 Damed lake will store 100 000 m3 To pilot WTP for production of 60 000 m3 drinking water quality Water balance established but the automatic floodgate is foreseen to have delays of 9 – 12 months before testing the system (summer 2021).

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7 T 1.2.1. Groundwater dams for subsurface water storage 2. New NextGen solutions

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8 3. Specific KPIs (actual vs expected) Case study Topic Objectives Specific Key Performance Indicator (KPI) Starting value Expected value #7 Gotland (SE) Wastewater treatment and reuse To treat the wastewater by a decentralized membrane treatment to obtain regenerated water for being stored in the controlled neutral ponds dams and, after another treatment, to be used as potable water Water yield of Water yield of the system [% of regenerated water produced] water produced] 0 10 % 80, 95, 75 Water quality - Removal yield [%] of the following parameters (outlet vs inlet): conductivity, COD, ammonia, Rainwater harvesting Rainwater harvesting and storage in surface dams & lake. Collection capacity [m3/year] 100 000 Drainage ditches with IoT Flow and water levels measuring and control Flow and water levels measured and controlled Every 10-30 min Aquifer storage Rainwater and lake water used in the water treatment plant for obtaining drinking water Pilot capacity [m3/year] 100 000 80, 10, 50, 80, 10, 99 Water quality - Removal yield [%] of the following parameters (outlet vs inlet): metals, conductivity, color, COD, some anions and E.coli. Energy Use of solar panels to minimize electricity consumption during wastewater reuse (summer) Electricity consumption [kWh/m3 regenerated water] 3

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9 4. Results T 1.2.1. Decentralised membrane treatment of sewage powered by solar energy Off-site tests Water quality Water recovery yield Energy consumption Parameter Removal (%) NH4 + 90% COD 88% Conductivity 99% TSS (No filter) 0% TSS (20 𝜇-filter) 40% TSS (30 𝜇-filter) 23% TSS (150 𝜇-filter) 6% Parameter Value Concentration Factor (CF) for the UF 10-25 Concentration Factor (CF) for the RO 7.3 Global CF 4.5 – 5.8 Water recovery 78 – 83% Off-site tests finalized. Pilot under construction. Pilot operation: March 2021

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10 4. Results T 1.2.1. Drainage ditches with IoT for flow and water levels control 1 300 000 m3 / year flows out to the sea Rain per day Ground water level IoT for establishment of water balance since 2019.

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11 4. Results T 1.2.1. Controlled neutral ponds dams for storage Water quality Inflow and outflow of water to lake Mjölhatteträsk plotted with precipitation data. IoT-sensors installed at MY3 and MY1. Water quantity Automatic floodgate and membrane filtration spring 2021

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12 4. Results T 1.2.1. Groundwater dams for subsurface water storage • Detailed investigation will finalized in November 2020 • If positive: Large scale capacity test in January 2021 2 2

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13 5. Lessons learned • When it comes to on-site evaluation at an far-away island of a number parameters, including communication with land-owners, pandemic out-breaks is a hinder for rapid achievements • Even by use of novel technologies and innovative methods, it is hard to predict overburdens (e.g. clay versus sand). • Unforeseen challengers is time-consuming but will result in new ideas and solutions that are interesting, fun and pushes the development forward . (Maybe not a very new lesson learned but confirms your experiences).

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14 Thank you! staffan.filipsson@ivl.se www.ivl.se xtGen - Community of Practice 14 anna.serra@eurecat.org sandra.cases@eurecat.org

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NextGen Gotland Sweden

  • 1. 1 Circular solutions for Water #7 Gotland Sweden Relevant data Relevant sectors Tourist industry Municipal sector Water sector Lead partners Storsudred testbed area: 14 000 ha Habitants during winter: 900 Habitants during summer : 1800 Tourists per year: 300 000
  • 2. 2 1. Objectives of the NextGen solutions • Rainwater harvesting using automatic floodgates to replenish aquifers and monitoring of aquifer levels • Decentralized membrane treatment of raw wastewater to reduce volumes treated at the central WWTP • Climate efficient wastewater reuse powered by solar energy to overcome carbon footprint drawbacks • Optimized membrane filtration for producing drinkable water from challenging surface water • Storage of water in subsurface dams Water
  • 3. 3 Technology Evidence Base (TEB) Gotland 1. Objectives of the NextGen solutions Positioning of demo case within the CE
  • 4. 4 T 1.2.1. Decentralised membrane treatment powered by solar energy 2. New NextGen solutions PRE-FILTRATION COAGULATION AND ULTRAFILTRATION UV SEDIMENTATION SCREEN DISC FILTER ULTRAFILTRATION REVERSE OSMOSIS UASB Annamox PRECIPITATION CHLORINATION UV PRECIPITATION Treatment in the WTP  drinking water Decentralised membrane treatment  regenerated water Sewage water Recovered water Sewage concentrate to external WWTP Solar energy Circular water systems
  • 5. 5 T 1.2.1. Drainage ditches with IoT for flow and water levels control 2. New NextGen solutions
  • 6. 6 T 1.2.1. Controlled nautral ponds dams for storage 2. New NextGen solutions Keep the surface level during the summer by an autmatic flood gate Inflow, ditch, hatch Burgsvik village Lake Reclaimed waste water 25 000 m3 Damed lake will store 100 000 m3 To pilot WTP for production of 60 000 m3 drinking water quality Water balance established but the automatic floodgate is foreseen to have delays of 9 – 12 months before testing the system (summer 2021).
  • 7. 7 T 1.2.1. Groundwater dams for subsurface water storage 2. New NextGen solutions
  • 8. 8 3. Specific KPIs (actual vs expected) Case study Topic Objectives Specific Key Performance Indicator (KPI) Starting value Expected value #7 Gotland (SE) Wastewater treatment and reuse To treat the wastewater by a decentralized membrane treatment to obtain regenerated water for being stored in the controlled neutral ponds dams and, after another treatment, to be used as potable water Water yield of Water yield of the system [% of regenerated water produced] water produced] 0 10 % 80, 95, 75 Water quality - Removal yield [%] of the following parameters (outlet vs inlet): conductivity, COD, ammonia, Rainwater harvesting Rainwater harvesting and storage in surface dams & lake. Collection capacity [m3/year] 100 000 Drainage ditches with IoT Flow and water levels measuring and control Flow and water levels measured and controlled Every 10-30 min Aquifer storage Rainwater and lake water used in the water treatment plant for obtaining drinking water Pilot capacity [m3/year] 100 000 80, 10, 50, 80, 10, 99 Water quality - Removal yield [%] of the following parameters (outlet vs inlet): metals, conductivity, color, COD, some anions and E.coli. Energy Use of solar panels to minimize electricity consumption during wastewater reuse (summer) Electricity consumption [kWh/m3 regenerated water] 3
  • 9. 9 4. Results T 1.2.1. Decentralised membrane treatment of sewage powered by solar energy Off-site tests Water quality Water recovery yield Energy consumption Parameter Removal (%) NH4 + 90% COD 88% Conductivity 99% TSS (No filter) 0% TSS (20 𝜇-filter) 40% TSS (30 𝜇-filter) 23% TSS (150 𝜇-filter) 6% Parameter Value Concentration Factor (CF) for the UF 10-25 Concentration Factor (CF) for the RO 7.3 Global CF 4.5 – 5.8 Water recovery 78 – 83% Off-site tests finalized. Pilot under construction. Pilot operation: March 2021
  • 10. 10 4. Results T 1.2.1. Drainage ditches with IoT for flow and water levels control 1 300 000 m3 / year flows out to the sea Rain per day Ground water level IoT for establishment of water balance since 2019.
  • 11. 11 4. Results T 1.2.1. Controlled neutral ponds dams for storage Water quality Inflow and outflow of water to lake Mjölhatteträsk plotted with precipitation data. IoT-sensors installed at MY3 and MY1. Water quantity Automatic floodgate and membrane filtration spring 2021
  • 12. 12 4. Results T 1.2.1. Groundwater dams for subsurface water storage • Detailed investigation will finalized in November 2020 • If positive: Large scale capacity test in January 2021 2 2
  • 13. 13 5. Lessons learned • When it comes to on-site evaluation at an far-away island of a number parameters, including communication with land-owners, pandemic out-breaks is a hinder for rapid achievements • Even by use of novel technologies and innovative methods, it is hard to predict overburdens (e.g. clay versus sand). • Unforeseen challengers is time-consuming but will result in new ideas and solutions that are interesting, fun and pushes the development forward . (Maybe not a very new lesson learned but confirms your experiences).
  • 14. 14 Thank you! staffan.filipsson@ivl.se www.ivl.se xtGen - Community of Practice 14 anna.serra@eurecat.org sandra.cases@eurecat.org