GENERACIÓN DE BIOGAS DE AGUAS RESIDUALES Y RELLENOS SANITARIOS.pdf

8/11/2019 GENERACIN DE BIOGAS DE AGUAS RESIDUALES Y RELLENOS SANITARIOS.pdf

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3rd BFC NET Workshop Site visit

Regional wastewater treatment plant LINZ

21.01.2005


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Structure of Linz AG


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Services provided by

Linz Service GmbH

Fresh water

Waste water / sewerage system and treatment

plant

Waste management / refuse disposal all types

Habour

Public swimming pools

Funeral and cemetery

Technical Services

IWA / physical, chemical and biological water

laboratory


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Business unit of waste water

1. Sewerage systemCollection and diversion of all waste water (residents,industries and business) for the City of Linz, operation andmaintenance

2. Serwerage planningEngineering, services for surrounding communities

3. Regional waste water treatment plantThe treatment and handling of waste water and sludge forthe City of Linz, the 39 surrounding communities and10 large industries

4. Customer relationsTariffs, professional advice and expertise


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Waste water treatment plant

Catchment area

Linz +

39 surrounding

communities+ 10 industries


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Consisting of

Sewers 551 km

16 pumping stations

3 rain retention basins

2 CSO`s

Sewerage system


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The plant overviews

Pictures: waste water treatment plant Asten


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0 25m 50m

KULTURTECHNIK UND WASSERWIRTSCHAFT

MASCHINENBAU (VERFAHRENSTECHNIK)

A-1030 WIEN, Fasangasse 25, Tel.:+43/1/7982400-0,Fax:-55



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Capacity

- Population equivalent 950.000 pe

- Hydraulic capacity:

- Dry weather flow: 2.2 m3/s

- Max wet weather flow: 8.8 m3/s

- Average annual flow: 60 Mio m3 / a

Mechanical biological waste water treatment technique

- Active sludge system

- carbon+nitrogen+phosphorus removal

- Anaerobic sludge digestion

- Sludge dewatering by chamber filter press

- Sludge disposal in mono-landfill

- Biogas ( landfill digester ) use in co-generation units


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Mechanical equipment of the treatment plant

Pictures: mechanical equipments


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Sludge Digestion

Digester

- 3 digester

- total volume 31.200 m

- amount of digester sludge 1.000 m/d, 3 - 3,5 % TS

- Retention time 30 d, 37 C

Gas storage/mixing tank

- volume 5.500 m

Gas produktion

- Approx. 15.000 m3/d, 64 % CH4


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Municipal landfill site

Biogas system

- 36 Biogas wells, ( Suction side p = - 80 -150 mbar )

- 3 blower/compressors ( max 1.800 m3/h )

- Gas purification plant ( out of operation )

- Volume landfill site 3.200.000 m

Gas produktion/collection

- Approx. 18.600 m3/d, 43 % CH4


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Power station

Co generation units

- 7 Co generation units

- Electrical power 650 kW

- Total electrical power 4.550 kW

- Average production efficiency approx. 34 %


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Energy production/use summary

Energy Balance ( 2004 ):

Co-Generation of Biogases from

- sludge digestion ( 5.5 mil. m3 /a, 64 % CH4 )

- municipal landfill site ( 6.8 mil. m3 /a, 45 % CH4 )

Total Production:- 21 GWh / a - efficiency approx: 34 %

Own consumption for waste water treatment plant:

- 14 GWh / a

Excess production, feed into public power net:

- 7 GWh / a


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Heat balance

Heat ( 2004 )

- Total capacity ( heat exchanger ) approx. 25.700.000 kWh/a

- Consumption of digester approx. 10.500.000 kWh/a

- Consumption hot water approx. 200.000 kWh/a

- Consumption heating approx. 1.000.000 kWh/a

- Ratio heat used related to heat exchanger capacity 45 %


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Operational problems

Siloxanes within biogases

- from landfill approx. 15 mg Si / Nm3

- from digester approx. 3 mg Si / Nm3

Leads to Silicium precipitation/deposits within the Co generation units


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Measures ( Study in preparation )

- Intensive maintenance procedure

Or

- activated carbon process for gas cleaning


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Costs

Over all costs ( incl. building ): 7 Cent / kWhel produced

from that:

Maintenance costs incl. ( Material/Personal costs ) : 2 Cent / kWhel

produced

GENERACIÓN DE BIOGAS DE AGUAS RESIDUALES Y RELLENOS SANITARIOS.pdf

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