Energy recovery through co-pyrolysis of wastewater sludge and forest residues – The transition from laboratory to pilot scale

Anaerobically digested sewage sludge mixed with forest residues was pyrolysed at 800 °C, laboratory and pilot scale. The study quantified differences in char gas yields for tests carried out a simple fixed bed reactor rotating retort pyrolyser scale, when the residence time of feedstock 10 min both cases. yield from scale 4 % lower than while 15.7 higher. During pyrolysis anaerobically blended quality energy recovery applications assessed fate impurities (tar, NH3 H2S) investigated. raw contained 14.6 g/Nm3 tar, 36.9 793 ppm H2S. Sixteen N-containing tar species were identified which pyridine, propenenitrile, 2-methyl-, benzonitrile, indole are found to be most abundant. compounds accounted approx. 12 total content. Conditioned 7.1 0.036 119 Benzene by far abundant compound followed toluene styrene. specifications used internal combustion engine exceeded due sum such as fluorantrene pyrene 4+ aromatic rings (at 0.0015 g/Nm3) content effectiveness sustainability wastewater treatment can improved using industry by-products.