FINNLAND: STRATEGIE UND VORGEHEN AM BEISPIEL HELSINKI

Transcription

1 FINNLAND: STRATEGIE UND VORGEHEN AM BEISPIEL HELSINKI Dipl.-Ing. Laura Rossi Helsinki Region Environmental Services Authority (HSY) Viikinmäki WWTP FOTO Helsinki/Finland

2 Helsinki Region Environmental Services Authority (HSY) What we do We produce and organise water services, waste management services and regional information Our customers Residents and companies in the Helsinki Metropolitan Area: 1.1 million people Our member municipalities Helsinki Espoo Vantaa Kauniainen Turnover ca. 354 million Employees 745 Premises 12 Finnland: Strategie und Virgehen Am Beispiel Helsinki/Laura Rossi/

3 Current wastewater and sludge management at HSY

4 Recycling of Phosphorus in WWTPs in Finland Only 13 large WWTP (> PE) Total ~ 520 WWTPs Treatment plants are build for chemical P removal Sludge is mostly composted In 2016, 40 % of treated sewage sludge was used in agriculture At the moment, no reguirements for WWTPs to recover P more efficiently

5 Technologies available on the markets for more efficient P recovery are not directly suitable for WWTPs in Finland No biological P removal No sludge incineration

6 RAVITA TM for effective P recovery

7 Combi process with N recovery

8 Research PE pilot plant at Viikinmäki WWTP - Post-precipitation and removal with disc filter - Chemical sludge dewatering - Lab scale - Dissolution - Solvent-solvent extraction - Technical readiness level 5-6 (max 9)

9 Results 1. With 1-step precipitation >80 % of P can be transferred to recovery part 2. With optimum parameters, 85 % of aluminum could be dissolved 1% 1% 22% 27% AlPO4 FeOH3 Al(OH)3 CaCO3 1% 3. In solvent-solvent extraction 97 % of aluminum was possible to transfer to organic phase 48% SiO2 Org RAVITA sludge contains mostly AlPO 4 and Al(OH) 3

10 RAVITA sludge quality Heavy metal dewatered RAVITA sludge Limit minirec * mg/kg P mg/kg P Cadmium 4 25 Mercury 1 10 Chromium Arsenic Lead Copper Nickel Zinc Organic compound Application Dewatered RAVITA sludge (mg/kg P) Polybrominated diphenylethers (BDE) Dewatered VKM sewage sludge (mg/kg P) tetrabde#47 0,0065 N.A PentaBDE#99 Flame retardants 0,0064 N.A DecaBDE#209 0,0988 N.A Bisfenol-A (BPA) Starting material LOD 11,9 for the synthesis of plastics (meta+para) -cresol precursor for various applications DI-(2-ethylhexyl) Phthalate plasticizers LOD 370 *K. Schenk, Phosphorus Recycling in Switzerland, presentation at IWA World Water Congress, September 2018, Tokyo. perfluorooctanesulfonate pesticide etc. LOD 0,2 (PFOS) Diclofenac Pharmaceuticals LOD 1,8 Carbamazepine and Personal Care Products LOD 0,8

11 FUTURE STEPS 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

12 THANK YOU! The RAVITA project has granted funding from the Finnish Ministry of the Environment RAKI Programme The RAKI RAVITA DEMO plant has been chosen as a part of the Finnish Government s key project on the circular economy RAVITA Process was selected as one of the three winners in BONUS Return competition in RAVITA won the SITRA Award on Municipal Recycling Act in Nominee for the Nordic Council Environment Prize 2018 Helsingin seudun ympäristöpalvelut kuntayhtymä Samkommunen Helsingforsregionens miljötjänster Helsinki Region Environmental Services Authority