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Gässlösa waste water treatment plant
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Gässlösa waste water treatment plant
Tony Strandh
Titel
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Gässlösa waste water treatment plant
FRISTAD HEDARED
SJÖMARKEN
APLARED
RÅNGEDALA
BORGSTENA
BREDARED
VISKAFORS
SANDH
ULT
SANDARED DALSJÖFORS
ÄSPERED
MÅLSRYD
KINNARUMMA
DANNIKE
Borås Municipality
0 2 4 10 km
GÅNGHESTER
SVANEHOLM
RYDBOHOLM
GINGRI
FRUFÄLLAN
TOSSERYD
SPARSÖR
8 WWTP
102 Pumping stations
Sewer pipes
2011-05-26
EKÅS
WWTPs and pump stations in Borås
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Gässlösa waste water treatment plant
Gässlösa WWTP
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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
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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 %)
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Gässlösa waste water treatment plant
Primary treatment - removes sand and particles
Step screens, 3 mm
Sand and grit chambers
Primary sedimentation, primary sludge
Sand used as bulk material
Solids are incinerated
Primary
sedimentation
Step screen
Primary sedimentation
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Gässlösa waste water treatment plant
Ciliates
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
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Gässlösa waste water treatment plant
STAR room
Block 1:1 Block 1:2
NO3NH4PO4
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Gässlösa waste water treatment plant
On the screen…
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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
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Gässlösa waste water treatment plant
Actiflo
Mikrosand
Koagulant
Slam
FlokkulantSlam + mikrosand
Injektionstank
Mogningstank
Lamellseparator
Hydro-cyklon
Utlopp
Inlopp1 2 3 4
5
Koaguleringstank
Chemical precipitation and lamell settling
Enhanced with micro sand (0,18 mm)
Hydro cyclones separates the sand and is reused
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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
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Gässlösa waste water treatment plant
Sludge - thers is more to it than water
Sludge turned into gas!
Anaerobic, Slow mixing
Temperature ~ 55 oC
Gas upgrading Bio gas
Engine, heater
GAS
SLUDGE
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Gässlösa waste water treatment plant
Process schematic
Stepscreens
Incommingwater
Sand trap Flocculant
Primarysettling
BioDenitrostep 1 och 2
BioDenitrostep 3
Intermediatesettling
Mixingchamber
Flocculant Finalsettling
Mechanical treatment Biological treatment Chemical treatment
Part II
Viskan
East
WestBy-pass
Sand wash
By pass
Reject
Primary sludge
Primarysettling
Intermediatesettling
Trickling filter
Part 1Watertreatment
Excess sludge
Chemical sludge
By-Pass
Primary sludge Recirculated sludgeExcess sludge
Primary sludge
Excess sludge
External sludgeandseptic
Sludge treatment
Mechanicalthickener
Digesters
Digested sludgeCentrifuge
Gas holder
Gas engine
Chem. Chem.
Power
Heat
Heating boiler
ActifloChem.
Chem.
Biogas
Gas treatment
Reject to part 2
Sludge silo
Wash
Ultrasound
Mechanical thickener
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Gässlösa waste water treatment plant