Pyrolysis and Carbocoal Characteristics for Biophysical Drying Sewage Sludge.

With the sewage sludge yield increasing, the sludge treatment becomes a major problem in China. The pyrolysis technology is used to treat the sewage sludge, because of a lot of advantages, such as good economic returns, the less secondary pollution and the higher utilize value of pyrolysis products. And it is considered as one of the great potential thermo-chemical treatment technology. A series of experiments were carried out to study the biophysics of drying sludge and how to get the variation of production gas, oil and coke at the different pyrolysis temperatures. Also, how to obtain high-value pyrolysis products at optimum pyrolysis temperature. At the same time, by studying the biophysical drying sludge's char formation mechanisms and physic-chemical properties at the different pyrolysis temperature conditions, the indirect reference data for pyrolysis of sludge were provided. It is providing theoretical guidance for the safe disposal of sludge, through sequential extraction method of European Communities Bureau of Reference (BCR) exploring different forms of semi-coke in the enrichment of heavy metals. [ABSTRACT FROM AUTHOR]