Title: Effect of wastewater treatment processes on the pyrolysis properties of the chars from sewage sludge pyrolysis
Abstract: The pyrolysis properties of five different pyrolysis chars,derived from the pyrolysis of five different sewage sludges from three wastewater treatment plants under 450 ℃,were studied by thermal gravimetric analysis with a heating rate of 10 ℃/min in nitrogen atmosphere.The results show that the pyrolysis processes of the five chars all can be divided into four stages:the stages of water release,slow weight loss,volatile release and residue decomposition respectively.Both the anaerobic process of wastewater treatment processes and sludge anaerobic digestion make the organic compounds in char complicated.The sludge anaerobic digestion improves the pyrolysis property of char,but the processes of anaerobic+aerobic and aerobic+anaerobic in wastewater treatment processes make the properties decrease,in which the influence of aerobic+anaerobic on the pyrolysis property of sludge is different from that of char;the third stage of char pyrolysis corresponds to the fourth stage of the sludge pyrolysis to some degree.The pyrolysis mechanisms of the five chars have been studied with Coats-Redfern method.It indicates that the mechanism functions of the five chars are not identical each other,but the pyrolysis activation energies of chars are higher than that of sludges.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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