Biological waste treatment at Lindum

Jan Petter HammerSubject Manager Chemistry/Biology

Presentation forAquateam with Polish guests

Lindum, 28. september 2009

Norway’s “Agenda 21”

• Recycling of nutrients• Local treatment favorized• Nutrients are recycled to where the food is being produced

Biological treatment

1) CompostingAerobic degradation

C6H12O6 + O2 CO2 + H2O

2) biogas productionAnaerobic degradation

C6H12O6 3 CH4 + 3 CO2

Composting methods at Lindum

• Windrow composting• Matress composting• Reactor composting• Active large windrow composting• AGBAG-kompostering

Important criteria

• The structure needs to be shredded to the right size• The mixture must be able to drain moisture and be

aerated• The mixture must have DM>30%• C/N-factor• Starting pH > 5• Energy must be removed in the process• Optimal degradation at 50-55 ⁰C

Process and quality control

• Temperature

• CO2, CH4 and O2

• DM• Odour• Energy

development• Volume reduction

• Hygiene: TKB and Salmonella

• Stability: SOUR test, ”rottegrad”

• Analysis of nutrients• Declaration

Soil products at Lindum

• Ecologial compost• Agricultural compost• Bulk soil mixtures• Bagged soil mixtures• Garden waste compost• Biological roof covers• Designed products for

customers

Sewage sludge treatment

Sludge utilization

Vikersund

2005 Steinsholt 2006 Statens

vegvesen

E 134

Food waste composting

Ecological

From food waste

To compost and soil

The food waste comes from large kitchens and food shops…

…. and from private households

The food waste is shredded andmixed with bark and lime

The mixture is inserted into the reactor composting facility…

… where it is transported into separate bins….

…. and the composting starts

Air is forced through the compost mixture, and it is turned several times each day.

Plastics and other reject materials are sifted from the compost and sent to energy recovery.

After 10 days, the compost is taken out and put into Ag-Bags for maturing.

Agbag ”sausages”

The compost is monitored by sampling and analyses.

Growth test in our lab

Finished compost, ready for use

Transport to ecological agriculture

Some of the compost is used in Lindum’s own soil mixtures

….and the product is bagged and sold in garden shops, super markets – and at Lindum