Gässlösa Waste Water Treatment Plant Tony Strandh Titel
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Gässlösa waste water treatment plant Tony Strandh Titel Gässlösa waste water treatment plant WWTPs and pump stations in Borås Borås Municipality 8 WWTP BORGSTENA 102 Pumping stations Sewer pipes FRISTAD HEDARED BREDARED GINGRI SPARSÖRRÅNGEDALA SANDH FRUFÄLLAN ULT TOSSERYD ÄSPERED EKÅS SJÖMARKEN SANDARED DALSJÖFORS GÅNGHESTER MÅLSRYD DANNIKE RYDBOHOLM VISKAFORS APLARED SVANEHOLM KINNARUMMA 0 2 4 10 km 2011-05-26 Gässlösa waste water treatment plant Gässlösa WWTP Gässlösa waste water treatment plant History of Gässlösa 1934 Mechanical treatment and digester 1939 Biological treatment, trickling filter 1967-70 Activated sludge , new part of Gässlösa 1976-77 Chemical precipitation 1999 Nitrogen removal, BioDenitro™ 2000 Chemical precipitation with Actiflo™ 2003 Gas treatment, bio gas 2016 New WWTP at Sobacken Gässlösa waste water treatment plant Gässlösa - Data 110 000 person equivalents 80 000 physical persons Textile and wall paper industries Max capacity 5400 m3/h (9600m3/h) 35 000 m3/day Effluent standards: P-tot 0,3 mg/l N-tot 15 mg/l BOD7 10 mg/l 800 ton sludge/month (DS 22 %) Gässlösa waste water treatment plant Primary treatment - removes sand and particles Step screens, 3 mm Sand and grit chambers Primary sedimentation, primary sludge Step screen Sand used as bulk material Solids are incinerated Primary sedimentation Gässlösa waste water Primary treatment plant sedimentation Biological treatment Activated sludge with nitrogen removal, 3 blocks x 2 tanks Alternating aeration depending on + - [NH4 ] and [NO3 ] + - Nitrification NH4 + O2 NO3 Aerobic - Denitrification NO3 + org.mtrl N2 Anaerobic Excess sludge, organisms Reduction of Organic matter, Nitrogen Phosphorus Trickling filters, old part Ciliates Gässlösa waste water treatment plant STAR room NO3 PO4 NH4 Block 1:1 Block 1:2 Gässlösa waste water treatment plant On the screen… Gässlösa waste water treatment plant Chemical treatment Aluminium salt, + charge Outgoing tot-P controls process Lamell settling, upto 2700 m3/h Actiflo™: Runs intermediate Capacity 2700 m3/h, max 1 mg/l Pin Micro sand Same capacity as traditional treatment Chemical sludge Gässlösa waste water treatment plant Actiflo Slam 5 Hydro- cyklon Mikrosand Lamellseparator Utlopp 1 2 3 4 Inlopp Koagulerings Injektions Mognings tank tank tank Koagulant Flokkulant Slam + mikrosand Chemical precipitation and lamell settling Enhanced with micro sand (0,18 mm) Hydro cyclones separates the sand and is reused Gässlösa waste water treatment plant Thickerning 2 lines, exess sludge and primary sludge Adding flocculant: Thickeners: -Drain water -In 1-3 DS% -Out 4-6 DS% -20-65 m3/h Excess and primary sludge Digesters Gässlösa waste water treatment plant Sludge - thers is more to it than water GAS Sludge turned into gas! Anaerobic, Slow mixing Temperature ~ 55 oC Gas upgrading Bio gas Engine, heater SLUDGE Gässlösa waste water treatment plant Process schematic Water Mechanical treatment Biological treatment Chemical treatment treatment Part 1 Primary Trickling filter Intermediate settling settling Chem.Actiflo Incomming Step Sand trap Flocculant water screens By-Pass Mixing Flocculant Final Viskan Primary sludge chamber settling Wash Chem. Excess sludge Chem. Chemical sludge East Part II Primary BioDenitro BioDenitro Intermediate settling step 1 och 2 step 3 Chem.settling Sand wash Reject West By-pass Recirculated sludge By pass Primary sludge Excess sludge Biogas Gas treatment Sludge treatment Gas holder Power Gas engine Mechanical Digesters Heat thickener Primary sludge Heating boiler Sludge silo Digested sludge Centrifuge Mechanical thickener Excess sludge Ultra sound External sludge and septic Reject to part 2 Gässlösa waste water treatment plant Gässlösa waste water treatment plant.