g¤ssl¶sa waste water treatment plant

Gässlösa waste water treatment plant


Tony Strandh

Titel


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


Gässlösa WWTP


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 - 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 %)


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


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


STAR room

Block 1:1 Block 1:2

NO3NH4PO4


On the screen…


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


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


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


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


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

g¤ssl¶sa waste water treatment plant

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