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 GINGRI SPARSÖRRÅNGEDALA SANDH FRUFÄLLAN ULT ÄSPERED EKÅS SJÖMARKEN DALSJÖFORS

GÅNGHESTER MÅLSRYD

VISKAFORS SVANEHOLM

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