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2011•Journal of South China Normal UniversityRequires access

STUDY ON CATALYTIC PYROLYSIS CHARACTERISTICS OF MUNICIPAL SEWAGE SLUDGE

Honghai Wu

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Abstract

To investigate the catalytic pyrolysis characteristics of dewatered municipal sewage sludge,the pyrolysis experiments were conducted using CaO,ZnCl2,K2CO3 as catalysts by the methods of thermogravimetry(TG) and differential scanning calorimeter(DSC),the SEM micrographs of pyrolytic sludge were also determined.The results showed that the pyrolysis process of dried sewage sludge was divided into three phases: moisture loss,volatile matter loss and fixed carbon loss for all sludge samples.The pyrolysis rate was greatly enhanced during the fixed carbon loss and the activation energy and pre-exponential factor decreased for the sludge sample with addition of catalyst.The catalytic activity of CaO were best among three catalysts.The addition of catalyst could enhance the particle dispersities of pyrolytic sludge.

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What this paper is about

To investigate the catalytic pyrolysis characteristics of dewatered municipal sewage sludge,the pyrolysis experiments were conducted using CaO,ZnCl2,K2CO3 as catalysts by the methods of thermogravimetry(TG) and differential scanning calorimeter(DSC),the SEM micrographs of pyrolytic sludge were also determined.The results showed that the pyrolysis process of dried sewage sludge was divided into three phases: moisture loss,volatile matter loss and fixed carbon loss for all sludge samples.The pyrolysis rate was greatly enhanced during the fixed carbon loss and the activation energy and pre-exponential factor decreased for the sludge sample with addition of catalyst.The catalytic activity of CaO were best among three catalysts.The addition of catalyst could enhance the particle dispersities of pyrolytic sludge.

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Available abstract

To investigate the catalytic pyrolysis characteristics of dewatered municipal sewage sludge,the pyrolysis experiments were conducted using CaO,ZnCl2,K2CO3 as catalysts by the methods of thermogravimetry(TG) and differential scanning calorimeter(DSC),the SEM micrographs of pyrolytic sludge were also determined.The results showed that the pyrolysis process of dried sewage sludge was divided into three phases: moisture loss,volatile matter loss and fixed carbon loss for all sludge samples.The pyrolysis rate was greatly enhanced during the fixed carbon loss and the activation energy and pre-exponential factor decreased for the sludge sample with addition of catalyst.The catalytic activity of CaO were best among three catalysts.The addition of catalyst could enhance the particle dispersities of pyrolytic sludge.

Key concepts: Pyrolysis, Sewage sludge, Pyrolytic carbon, Catalysis, Thermogravimetry, Moisture, Differential scanning calorimetry, Chemistry

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