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Biological waste treatment at Lindum Jan Petter Hammer Subject Manager Chemistry/Biology Presentation for Aquateam with Polish guests Lindum, 28. september 2009
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Norway’s “Agenda 21” Recycling of nutrients Local treatment favorized Nutrients are recycled to where the food is being produced
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Biological treatment 1) Composting Aerobic degradation C 6 H 12 O 6 + O 2 CO 2 + H 2 O 2) biogas production Anaerobic degradation C 6 H 12 O 6 3 CH 4 + 3 CO 2
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Composting methods at Lindum Windrow composting Matress composting Reactor composting Active large windrow composting AGBAG-kompostering
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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
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Process and quality control Temperature CO 2, CH 4 and O 2 DM Odour Energy development Volume reduction Hygiene: TKB and Salmonella Stability: SOUR test, ”rottegrad” Analysis of nutrients Declaration
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Soil products at Lindum Ecologial compost Agricultural compost Bulk soil mixtures Bagged soil mixtures Garden waste compost Biological roof covers Designed products for customers
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Sewage sludge treatment
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Sludge utilization Vikersund
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2005 Steinsholt 2006 Statens vegvesen E 134
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Food waste composting Ecological
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From food waste To compost and soil
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The food waste comes from large kitchens and food shops…
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…. and from private households
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The food waste is shredded andmixed with bark and lime
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The mixture is inserted into the reactor composting facility…
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… where it is transported into separate bins….
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…. and the composting starts Air is forced through the compost mixture, and it is turned several times each day.
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Plastics and other reject materials are sifted from the compost and sent to energy recovery.
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After 10 days, the compost is taken out and put into Ag- Bags for maturing.
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Agbag ”sausages”
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The compost is monitored by sampling and analyses.
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Growth test in our lab
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Finished compost, ready for use
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Transport to ecological agriculture
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Some of the compost is used in Lindum’s own soil mixtures
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….and the product is bagged and sold in garden shops, super markets – and at Lindum
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