Pyrolysis characteristics of pharmaceutical sewage sludge and brown coal

I&EC 6

Liguo Zhang, zhang1li2guo3@163.com1, Chongwei Cui, cuichongwei1991@126.com2, Jun Yin, hitjunyin@163.com3, and Lei Liu, NA3. (1) School of Municpal and Environmental Engineering, Harbin Institute of Technology, No. 202 Haihe Road, Harbin, China, (2) Department of Environmental Engineering, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China, (3) Department of Environmental Engineering, Jilin Architectural and Civil Engineering Institute, No. 1129 Hongqi Street, Changchun 130021, NA, China
Pyrolysis provides a potential alternative method for treating pharmaceutical sewage sludge. The aim of the present work is to investigate pyrolysis characteristics of sewage sludge together with brown coal by the methods of thermogravimetry (TG) and differential thermal analysis (DTA). The pyrolysis tests were carried out at a constant heating rate of 10 0C/min in the temperature range of 20-800 0C. According to the pyrolysis data, activation energy and pre-exponential factor were calculated, and the universal integral method was used to ascertain the optimal reaction mechanism of pyrolysis. The results indicate that the pyrolysis process of dried pharmaceutical sludge is divided into three phases: moisture loss(43.5-169.5 0C), volatile matter loss(166.5-416.39 0C) and fixed carbon loss (469.39-670.6 0C). Caloric energy of sludge pyrolysis is mostly released from fixed carbon, and partially released from volatile matter. Based on the pyrolysis kinetics of non-isothermal and heterogeneous system, nucleation and growth is the most probable mechanism of pyrolysis for pharmaceutical sludge and sample 1. No.13 and No.15 functions in integral forms are in the same series, which may suggest that there exists no apparent interaction between sludge and coal during the pyrolysis
 

Alternative Resources for the Chemical Industry
8:30 AM-11:55 AM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 223, Oral

Division of Industrial & Engineering Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008