Abstract
The oil separated by steam distillation after liquefaction of sewage sludge was fractionated to strongly acidic, weakly acidic, basic, and neutral fractions by acid-base extraction. The total recovery of fractions was 77%. Each fraction was analysed by g.c.-m.s., and 71 types of compound were identified with reasonable certainty. No strongly acidic fraction was obtained. The weakly acidic fraction, comprising 2% of the oil, was exclusively composed of phenolic compounds. The basic fraction, comprising 20% of the oil, was exclusively composed of pyridines, pyrazines, quinolines, amines and methylphenylacetamide. The neutral fraction, comprising 56% of the oil, was exclusively composed of aliphatic compounds, alicyclic compounds, alcohols, ketones, aromatic compounds, sulphur-containing compounds, nitrogen-containing compounds and oxygen-containing heterocyclic compounds.
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