Foss Farm/Foss Biolab

By Knut VasdalFarmer at Foss farm

(knut@vasdal.no)

Presentation at Bioseminar,Telemark University College,

21. December 2011

Foss farm60 milking

cowsOrganic farming since 1990

food

Meat and milk

MetanM

anur

e

Fertilizer

Met

an

N2O

N2O

Organic farming

• No chemical/syntetical fertilizer

• No pesticides

Organic farming systems

• Crop rotation • Ruminant animals• Biological nitrification • Soil structure

Cow manure slurry 2011 Foss farm

Cow manure slurry

• -Great NH3- emission after spreading at fields• -Difficult to utilize in high populated area• -Demage soil structure• -Conserve weed seeds and patogen spores• -Impossible to spread exactly• +Cost efficent way to spread on fields

Process line Foss biolab

Foss biolab • Started 2007• 2010- indoors• 2011 pilot process line

for cow manure

• Scientific works• Test lab for full scale full

scale biogas plants• Education

Solid/fibrous fraction

• Vermicomposting• Improve soil structure• Remove stinky smell• Increase microbial activity• Decrease weed seeds

germination• Remove patogen

organism• Stabilize carbon fraction

Organic matter in the soil-soil fertility

• Water houshold• Microbial activity• Nutrition exchange capasity• Aggregat building/soil structure• Heat absorption• Soil erosion resistance• Carbon immobilization

Biogas-Foss farm

• Bioenergy central• Hot water for 32 houses

need 384 000kWh• 86 000kWh energy from

biogas• Wood chips for rest

energy demand• Start up 2012-2013

Foss Housing AreaCa: 20 housing

Housing reaCa: 12 boenheter

Bioheatcentral

Biogas plant

Foss farm

JPE/2011

Liquid nitrified fertilizer• No N- emission• No N2O-emission• No smell• Spreading indors or outdoors

even on sunny days• No residues on leaves• No patogens• No weeds• Easy to spread exactly• Also as leaf fertilizer• Available directly as plant

nutrition

Chemical changes during AD and DNR process for nitrogen

40 50 60 70 80 90 100 110 1200

200

400

600

800

1000

1200NH4-N: ADR infl = magenta. ADR effl = DNR infl = red. DNR effl = blue.

[ppm

]

Time, t [d]. Time ref (t=0):13-Aug-2011 00:00:01. Min t:26-Sep-2011 00:00:01. Max t:08-Dec-2011

Physical changes during AD and DNR process for sCOD

50 60 70 80 90 100 1100

2

4

6

8

10

12

14

16

18

20sCOD. ADR infl = magenta. ADR effl = DNR infl = red. DNR effl = blue

[g/L

]

Time, t [d]. Time ref (t=0):13-Aug-2011 00:00:01. Min t:26-Sep-2011 00:00:01. Max t:08-Dec-2011

ph dependency on NH3/NH4+

Physical changes during AD and DNR process for pH

50 60 70 80 90 100 1106.5

7

7.5

8

8.5pH. ADR infl = magenta. ADR effl = DNR infl = red. DNR effl = blue

log1

0(H

+)

Time, t [d]. Time ref (t=0):13-Aug-2011 00:00:01. Min t:26-Sep-2011 00:00:01. Max t:08-Dec-2011

Physical changes during AD and DNR process for alcalinity

50 60 70 80 90 100 1100

5000

10000

15000Alkalinity. ADR infl = magenta. ADR effl = DNR infl = red. DNR effl = blue

[mg

CaC

O3/

L]

Time, t [d]. Time ref (t=0):13-Aug-2011 00:00:01. Min t:26-Sep-2011 00:00:01. Max t:08-Dec-2011

Gas productivity on different batch

50 60 70 80 90 100 1100

20

40

60Foss ADR. Feed flow = blue. Reac temp = green (smoothed from t=81d). Batch no: 20110627 = green *. 20110830 = red o. 20111107 = blue*.

[L/d

] and

[Deg

C]

50 60 70 80 90 100 1100

100

200

300Foss ADR. CH4 gas flow.

[L/d

]

50 60 70 80 90 100 1100

10

20

30

40Foss ADR. Temperatures: AD reactor (inside) = red. Room = blue. Reservoir = green. (Smoothed from appr t=81 d.)

[Deg

C]

Time, t [d]. Time ref (t=0):13-Aug-2011 00:00:01. Min t:26-Sep-2011 00:00:01. Max t:08-Dec-2011

50 60 70 80 90 100 1100

2

4

6

8

10

12

14

16

18

20Gas production efficiency: Fmeth [L/d] / Ffeed [L/d] (based on assumed feed flow)

[(L/d

CH

4) /

(L/d

feed

)]

Time, t [d]. Time ref (t=0):13-Aug-2011 00:00:01. Min t:26-Sep-2011 00:00:01. Max t:08-Dec-2011