the Blominmki WWTP and RAVITA innovation Mari Heinonen Director of - PowerPoint PPT Presentation

Case study: the Blominmäki WWTP and RAVITA innovation Mari Heinonen Director of the wastewater services division Helsinki Region Environmental Services

Helsinki Region Environmental Services Authority Water services

Helsinki Region Environmental Services Authority HSY Waste management services Environmental High-quality regional drinking water information for over a million inhabitants Effective wastewater treatment for 1,4 MPE Energy from biogas Eco-compost from sludge Heat from wastewater Purely better, every day

Mäntsälä Metropolitan area sewer system Pornainen 1. Suomenoja wastewater Sewer tunnel Järvenpää treatment plant 1962-2022 Pressure sewer 2. Viikinmäki wastewater treatment plant 1994- … Large pumping station Area with combined sewer system 3. Blominmäki wastewater Tuusula treatment plant and tunnels Kerava Sewer district boundary (under construction) 2022- Outfall tunnel … Sipoo 4. Metsäpirtti composting field Vantaa for sludge 4 Espoo Helsinki Kauniainen 2 Facts: 3 Siuntio Municipal wastewater treatment since Kirkkonummi 1 1910, AS process + biogas since 1932 2019: Two wastewater treatment plants New Blominmäki WWTP 2022 Combined sewer system in the centre of Helsinki, separate sewers elsewhere

Case story: New Blominmäki WWTP 5

Why Do We Need Increased Wastewater Treatment Performance and Capacity? • Population growth ‒ Plant load values for 2040 = 1,5 x current load • Increasingly strict treatment requirements by the authorities ‒ Environmental permissions have become tighter ‒ Design targets for effluent water: Phosphorus 0,2 mg/l , nitrogen reduction > 90 % , UV hygienization and bypass water treatment ‒ Prepared plans for other requirements (e.g. removal of micro pollutants) • Protection targets of the Baltic Sea ‒ Loads from large point sources (e.g. WWTP) must be controlled and limited, even though the majority of load is coming from diffuse pollution • Increasing nutrient (nitrogen) levels in influent wastewater ‒ Increased consumption of protein e.g. meat and dairy products • Climate change adaption ‒ More runoffs to sewers, preparing for floods 6

Location options and selected position 7

Blominmäki wastewater Effluent tunnel shaft treatment plant Inlet tunnel from Mikkelänkallio northern main sewer access tunnel Söderskog inlet tunnel Overflow route from sewer to effluent tunnel Malminmäki access tunnel Friisilä access tunnel Inlet tunnel from southern main sewer Sewer tunnel Finnoo access Effluent tunnel tunnel Existing Suomenoja effluent tunnel Suomenoja effluent tunnel, leads to Access tunnel for vehicles Suomenoja inverted siphons , outer archipelago of Espoo Western Metro buildings of current WWTP

Treatment Requirements and Targets HSY’s Blominmäki HELCOM Existing Treatment WWTP Recommen- Suomenoja Objective for Permit dation WWTP Blominmäki Values Permit Values Phosphorus (P tot ) < 0.2 mg/l < 0.25 mg/l < 0.5 mg/l < 0.35 mg/l Phosphorus removal efficiency > 96% > 96% > 90% > 95% < 5 mg/l Nitrogen (N tot ) - < 10 mg/l - Nitrogen removal > 70 – 80% efficiency > 90% > 80% > 70% Biochemical oxygen demand < 8 mg/l (BOD 7 ) < 10 mg/l < 15 mg/l < 10 mg/l BOD 7 removal efficiency > 96% > 95% > 90% > 95% 9

Blominmäki WWTP 2040: 150 000 m 3 /d 550 000 PE Option UV OR THERMAL PROCESSING 10

Blominmäki wastewater treatment plant 150 000 m 3 /d 400 000 PE v. 2020 ➔ 550 000 PE v. 2040 1. Influent tank 2. Fine screen 3. Sand removal 4. Primary sedimentation 5. Aeration tanks 6. Secondary sedimentation tanks 7. Biological filters 8. Sludge thickening 9. Digestion reactors 10. Emergency exits 11. Reject water treatment 12. Exhaust pump 13. Administrative building 14. Storage/workshop 15. Sludge and biogas building 16. Sludge storage silos 17. Disc filters, approx. 20 µm 18. Gas storage tanks 19. Vehicle tunnels 20. Inlet and discharge sewer tunnels

Energy efficiency in Blominmäki WWTP Biogas production c a.5,5 Mm 3 /year (65 % CH 4 ). Biogas will be used in own power production like we do in Viikinmäki WWTP – 70 % electrical energy self-sufficiency in start up (Viikinmäki WWTP 95- 100 %) • Gas engines (2 x 1,6 MW) – Heat recovery from the electrical energy production • ORC-process (170 kW) – Utilizes the waste heat of gas engines’ exhaust gas and transfer it to electrical energy • Water turbines (25 kW), in effluent water • Solar Panels (400 kW), Panel fields on roofs and in the field • All equipment are energy efficient and used will be optimized – 100 % self-sufficiency in heat production: Several heat recovery points, 5400 m 3 energy storage and heat pump. •

Cost Budjet Cost Budget M€ Plant Excavations 86 Influent and Effluent Tunnel Excavations 61 Influent arragements from Suomenoja 10 Construction 79 Machinery 54 HVAC 11 Instrumentation and Automation 7 Electrical Work 15 EIB and NIB loans are the main instruments Design and Constuction for the economy of the investment Management 16 management Reservations for Increase of Excavation Costs 15 Reservations for Other Unpredicted Costs 17 13 Total 371

Design period 2009-2017 (2018-2021) 14

Aerial View (Planning Phase) Helsinki – Turku Motorway E18 E18 Helsinki – Turku Motorway 15

Underground Lay-Out Screening Grit removal Pre-sedimentation Aeration (Compressors) Secondary Sedimentation DN-filters Reservation for exhaust air treatment Reservation for Incoming chemicals micropollutant removal Dried sludge Digesters Thickening Discfiters UV hygienization 16

3D design of Blominmäki 17 17

Ground Lay-Out

Construction period 19

Excavation period 2015-2018 • One construction contract with former Lemminkäinen Ltd. • Excavated volume ca. 1 000 000 m 3 • Excavated rock has been and will be utilized as blast stones and raw material for gravel and sand

E x c a Raising excavation v a t i Container for underground Deepening excavation safety purposes o of the digester n

Construction period 2018-2022 • One main construction contract for YIT Ltd. • Project management contract agreement with target budget • Construction area ca. 100 000 m 2 equal to 14 football fields • Examples of construction materials: 85 000 m 3 concrete • • 7,5 Mkg of reinforcement iron • more than 40 km stainless steel pipes

E C x h h i a m u n s e t y A i • 100 m high r • Slip casting method

D i g e s t e r s

Construction site at present

RAVITA Innovation for recovering phosphorus

Phosphorus • According to different sources virgin phosphorus deposits will last for 40-100 years • Most countries depend on imported P • In Middle-Europe few WWTPs have demands to recover P – Germany – Switzerland – Austria • Recovery potential meets only large WWTP • Cost of the recovered P is not competitive

Phosphoric Effluent acid recirculation wastewater End product 1 Acid Recovery of SURPLUS Post- Dissolution Phoshorus Metal phosphate PHOSPHORIC precipitations Chemical sludge Phosphoric acid step solution ACID and separation Separation step Precipitation chemical Treated wastewater Precipitation chemical recirculation WWTP BIOSLUDGE Phosphorus recovery from water phase

Heavy metals in RAVITA-sludge 70 4,500 60 4,000 mg /kg Phosphorus 3,500 50 mg /kg Phosphorus 3,000 40 2,500 30 2,000 ■ RAVITA sludge 1,500 20 ■ Viikinmäki WWTP sludge 1,000 ■ 10 Legislative limit 500 0 0 As Pb Ni Cd Hg Heavy metal Heavy metal 70,000 60,000 mg /kg Phosphorus 50,000 40,000 30,000 20,000 10,000 0 Cr Cu Zn Heavy metal

TECHNICAL steps • RAVITA DEMO plant – Increase of TRL (now 5 - 6) – Dissolution and separation of RAVITA sludge into the DEMO scale • Energy and mass balances • More analyses of the end product quality – Hazardous substances and microplastics BUSINESS steps • Ecosystem mining for potential partners (out of the box) and clients • End users ideas and comments needed to complete the business concept RAVITA Future steps

Puhtaasti parempaa arkea | En rent bättre vardag | Purely better, every day Thank You! Helsingin seudun ympäristöpalvelut -kuntayhtymä Samkommunen Helsingforsregionens miljötjänster Helsinki Region Environmental Services Authority