Balancing green energy and materials recycling: woody biomass for combustion and green waste composting combined with compost for growing media? Vandecasteele.

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Presentation transcript:

Balancing green energy and materials recycling: woody biomass for combustion and green waste composting combined with compost for growing media? Vandecasteele Bart1, Boogaerts Christophe2, Vandaele Elke2 1 Institute for Agricultural and Fisheries Research (ILVO) 2 Vlaco npo

CURRENT SCENARIO GREEN WASTE SYNECO SCENARIO GREEN WASTE Woody biomass for combustion? Fine fraction for AD?

Experimental set-up Full-scale composting experiments: Green waste composting 9 compost facilities 3 periods during 1 year 2 scenarios: regular versus experimental 3 fractions: woody biomass, feedstock for composting and compost

Green waste Regular Experimental Woody biomass Sieving Compost Feedstock Composting Sieving Compost Green waste Experimental Feedstock Sieving Woody biomass Composting Compost

Quality assessment Process: °C, turning frequency, … Organic matter (OM) and total nutrients, C/N, C/P Woody biomass: gross calorific value stones & impurities Cl and S Feedstock and compost: biochemical composition Compost: Waterextractable and plant-available nutrients N immobilisation OUR pH, EC, germinable seeds

Effect of period during the year Regular Green waste collected in Summer vs. Winter and Spring: Lower % OM, higher nutrient content

Effect on the green waste feedstock Regular versus experimental Green waste collected in: Spring: clear effect Lower % OM: 47 vs. 73 %OM/DM Higher nutrient content Summer: small effect Winter: small effect

Effect on recovered woody biomass Regular versus experimental Green waste collected in: Spring: small effect Summer: small effect Winter: small effect

Effect on compost quality Regular versus experimental Green waste collected in: Spring: small effect Summer: small effect Winter: slightly lower % OM: 32.2 vs. 34.6 %OM/DM

Effect on compost quality (2) Positive correlation between N immobilisation in the compost and Oxygen Uptake Rate (= microbial activity)

Changing the composting process Experimental composting: more intensive process Higher turning frequency = faster process but higher operational costs Composting periods (excluding the curing phase and storage) can be reduced to: minimum 15 weeks for static piles turned fortnightly for static piles turned at least once a month but with an initial tunnel composting or with forced aeration minimum 10 weeks for windrow composting with weekly turning.

Added-value composts for growing media Lab-scale experiments with sieving out the fine fraction < 0.5 mm 16 composts based on material collected in spring, i.e.; the compost with the highest organic matter content Matrix EC Dry matter Org. matter µS/cm %/fresh %/DM unsieved 580 69 33 23 sieved 536 64 44 28 P-value t-test 0.16 0.000

Conclusions Seasonal effect on biochemical composition of green waste feedstock and compost Intensive composting compensated for extracting woody biomass from the feedstock For green waste collected in summer extraction of woody biomass is not advised N immobilization in compost was positively correlated with microbial activity Use in growing media: high OM content by sieving out the fine fraction

More information? Vandecasteele, B., Boogaerts, C., Vandaele, E. 2016. Combining woody biomass for combustion with green waste composting: effect of removal of woody biomass on compost quality. Waste management 10.1016/j.Wasman.2016.09.012.