The bio-oil obtained from sewage sludge pyrolysis

In this paper, the pyrolysis treatment of sewage sludge was studied in a laboratory fixed bed reactor at temperature range of 400~600 ⁰C. Meanwhile, the influences of the final pyrolysis temperature, the heating rate and ZnO additive on the characteristics of the resulting bio-oil were also investigated. The experimental results indicated that more than 35% bio-oil yield was achieved at a pyrolysis temperature range of 500~600 ⁰C and a heating rate of 5 ⁰C/min. Meanwhile, ZnO has some contributions to the vaporation of the volatile in the sewage sludge. Moreover, heavy oxygenated hydrocarbons in the bio-oil are as high as 90%, which should be updated and then reused as fuel.