Effect of sawdust addition and composting of feedstock on renewable energy and biochar production from pyrolysis of anaerobically digested pig manure

► The products of the pyrolysis of separated solids of AD pig manure were studied. ► The effect of sawdust addition and composting of the feedstock were analysed. ► An energy balance was undertaken for all feedstocks. ► Sawdust addition increases the energy production but reduces fertilise value. ► Composting the feedstock reduces energy production and biochar fertiliser value.