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Burkart Dry Digester

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Experiences with the operation of different dry digester DRANCO BEKON Burkart Schulte Gesellschaft zur Verarbeitung organischer Abfälle - GVoA mbH Hille 1 Symposium on Anaerobic Digestion of Municipal Organic Solid Waste - March 2013 Mexico City
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Experiences with the operation of different dry digester

DRANCO

BEKON Burkart Schulte

Gesellschaft zur Verarbeitung organischer Abfälle - GVoA mbH Hille

1 Symposium on Anaerobic Digestion of Municipal Organic Solid Waste - March 2013 Mexico City

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• Composting Plant for 50.000 To/ ann.

• Digester for 40.000 to/a type BEKON

• Landfill with a volume of 5 Mio m3

• MBT – plant for 100.000 to / ann. With digester type DRANCO

• Sewage treatment plant for 15 m3 / hour

• Drying plant for sewage sludge

• 3 power generators for landfill and digester gas

each 500 kW

• Infrastructure

Units at the Pohlsche-Heide

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RDF Powerplant Minden

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Privat public partnership company 65 % district government

35 % private Company

Society for recycling of organic waste

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Operator of the recycling center Pohlsche Heide

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ADVANTAGES OF ANAEROBIC DIGESTION OF SOLID WASTE

• PRODUCTION OF RENEWABLE ENERGY (60 TO 100 M³ OF METHANE/TON)

• L ESS ENERGIE NEEDED FOR AERATION OF THE COMPOST PILE

• 200 TIMES LESS ODOURS THAN AEROBIC COMPOSTING (BASIS: GRAMS OF VOC PER TON TREATED)

• LESS SURFACE AREA NEEDED AS FOR AEROBIC COMPOSTING

• HIGH PUBLIC ACCEPTANCE

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Degradation of organic material:

AEROB

C6H12O6 + 6 O2 => 6 CO2 + 6 H2O Traubenzucker + Sauerstoff => Kohlendioxid + Wasser

Free Energie Go = - 2‘875 kJ/Mol = (Head)

ANAEROB:

C6H12O6 => 3 CO2 + 3 CH4 Traubenzucker => Kohlendioxid + Methan

Free Energie Go = - 132 kJ/Mol = (Methane)

Result:

Aerobe composting needs 20 times more energy then anaerobe digesting.

The remaining energy is in the Methane.

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FULL STREAM DIGESTION

RESIDUAL WASTE

SHREDDER SORTING

ANAEROBIC DIGESTION

DEWATERING

COMPOST, INCINERATION, LANDFILL

METALS RDF

BIOGAS

PROCESS WATER

AEROBIC COMPOSTING / DRYING

WATER CO2

Symposium on Anaerobic Digestion of Municipal Organic Solid Waste - March 2013 Mexico City

SCREENING

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PARTIAL STREAM DIGESTION

RESIDUAL WASTE

SHREDDER SORTING

AEROBIC COMPOSTING

DRYING

COMPOST, INCINERATION OR LANDFILL

METALS RDF

CO2 WATER

ANAEROBIC DIGESTION

70 %

BIOGAS

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30 %

BYPASS

SCREENING

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PARTIAL STREAM DIGESTION

RESIDUAL WASTE

SHREDDER SORTING

AEROBIC COMPOSTING

DRYING

COMPOST, INCINERATION OR LANDFILL

METALS RDF

CO2 WATER

ANAEROBIC DIGESTION

70 %

BIOGAS

Symposium on Anaerobic Digestion of Municipal Organic Solid Waste - March 2013 Mexico City

30 %

BYPASS

SCREENING

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Basic Type of Digestor Technology :

Liquid Digestor

Plug Stream Digestor

Batch Digestor

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MBT Pohlsche Heide

exhaust air treatment

digester

block heat and power plant

Mechanical treatment

Biological decomposition

Discharge to landfill

delivery

containerisation RDF*

*RDF = refused derived fuels Symposium on Anaerobic Digestion of Municipal Organic Solid Waste - March

2013 Mexico City

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MBT Biological treatment

Loading unit

Digester Composting

Block heat and power plant

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THE DRANCO DIGESTER Plug Flow - Process

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DRANCO PLANT HILLE

FEEDING PUMP

STEAM GENERATOR

MIXING UNIT

Biogas

DRANCO DIGESTER 2.260 m³

Steam

DOSING UNIT

Sewage sludge

GAS STORAGE GAS COOLING

GAS BLOWERS

GAS ENGINE

RTO

Existing flare

SILOXANE ADSORBER

Process water

Municipal solid waste

INTENSIVE COMPOSTING

COMPOSTING Landfill

ROTATING SIEVE (60/300 mm)

MAGNET

Fraction < 60 mm

Fraction 60-300 mm

Fraction > 300 mm

TOTAL ENERGY PLANT

Landfill

AIR SEPARATOR

NON-FERROUS SEPARATOR

Heavy parts to incineration

Light parts

Heavy parts

SHREDDER

MAGNET

BALLISTIC SEPARATOR

Hard materials

Industrial waste

SHREDDER

To intermediate storage

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To avoid the creation of H2S we can add Fe Cl2, this creates FeS and CL

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Product outlet of the digester

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INPUT IN REACTOR & BIOGAS PRODUCTION -DRANCO PLANT POHLSCHE HEIDE-

0

100

200

300

400

500

600

700

34 35 36 37 38 39 40 41 42 43

Week (2006)

To

ns

0

20

40

60

80

100

120

140

Nm

³/Mg

eq

. wa

ste

l

Total reactor input Biogas production

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MBA-Deponat

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< 25 mm

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Dry fermentation of biowaste by

batch process

with Aerobisation of digestate

Process The

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The Process

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Vechta

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Kusel, near Kaiserslautern Renewables 7,500 t/p.a. Electrical Power 330 kW In Operation as of 01/07 Local Heat / Drying

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BioFert, Saalfeld, near Erfurt: 1050 KW Capacity: 18,200 Mg/a

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PLANT OPERATING • Around 50 % of the output from a fermantation

Box is needet for the mixture with the fresch incoming biowaste.

• The mixture remains 4 weeks in the fermantation box.

• Filling and emtying is only done by wheehlloader.

• Bevore a box can be open, it has to be co2-purged in order to flush al methane out. This mixture goes to the powerplant and is burned.

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HIGH-SOLIDS ANAEROBIC DIGESTION

0

10

20

30

40

50

60

70

80

90

100

0 1 2 3 4 5 6 7 8 9 10

Cellulose

Cellulose paper

Kraft paper

Cardboard

Magazines

Newspaper

PE

TIME (DAYS)

BIO

DE

GR

AD

AT

ION

(%

)

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Padua & Munich Biowaste Biogas Yield

Gas O

utp

ut

Nm

³/t

FM

0

15

30

45

60

75

90

105

120

135

150

165

180

195

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34

Verweilzeit in Tagen

Specif. Padua Output Nm³/t FM

175 m 3

/t or 365 kWh el /t FM

Specif. Munich Output 80 to 110Nm³/t FM

Detention Period (Days)

Gas

ert

rag

Nm

³/t

FM

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Continuous Biogas Yield

Time

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625 kW el Biogas Powerplant

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My favored combination of DIGESTION processes

RESIDUAL WASTE

SHREDDER SORTING

AEROBIC COMPOSTING DRYING

COMPOST, INCINERATION OR LANDFILL

METALS RDF

CO2 WATER

DRANCO DIGESTION

50 %

BIOGAS

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50 %

SCREENING

BEKON DIGESTION

Sludge etc.

BIOGAS

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Small digester for a throughput up to 10 t per day

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Electrical power 100 kW Electrical efficiency 38 % Thermal power 123 kW

Thermal efficiency 46.6 % Overall efficiency 84.6 %

Data for the Combined heat and power plant (CHP):

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Economie of waste recycling

• Profit: – RDF production (we save around 20.000 t of oil per year)

– Kompost-produktion (in some countries 1 t costs more then 100 €)

– Methan-production ( we produce around 2 MW from digestion)

– Metall recycling

– Avoiding of a landfill ( an engeered Landfill can cost 10€ per m3)

• Costs: – Investment

– Finanzial costs

– Operation costs

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My opinion:

• In the future the recycled material will be of increesing value.

• The costs of the recycling will decrease do to technical development

• The environmentel impact of the landfilling of untreated waste becomes unacceptable .

• Lets work together to develop a better waste policy worldwide.

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Gracias por su atencion !

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