Dissertation > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization

Study on the Mechanism of Thermal Pyrolysis Properties and Conversion Process for Municipal Sewage Sludge

Author ChenMan
Tutor JinBaoSheng
School Southeast University
Course Environmental Engineering
Keywords Sludge Low temperature pyrolysis Thermal gravimetric analysis Pyrolysis dynamics Sludge oil Column chromatography Gas chromatography - mass spectrometry Mechanism
CLC X703
Type Master's thesis
Year 2006
Downloads 722
Quotes 9
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With the increasing amount of sludge and the environment with increasingly stringent quality standards, sludge treatment and disposal has become a sensitive global environmental issues. Moreover, with the increasing pressure on traditional disposal methods, must find innovative and effective method of sludge disposal. First, a brief description of the status quo and development trend of treatment of sewage sludge pyrolysis. Thermal gravimetric analysis of the the sludge pyrolysis process and its dynamics study proposed the sludge pyrolysis four stage, the first stage of the water analysis stage, second stage and third stage is organics based decomposition stage, the fourth stage is the stage of inorganics and the decomposition of the residual organics. Sludge organic matter decomposition reaction calculated by Coats-Redfern order to determine the apparent activation energy and frequency factor of the sludge samples given sample pyrolysis kinetic equation by theoretical calculations, theoretical data The experimental data are in good agreement. Sludge pyrolysis experiment using a self-designed to study the influence of the characteristics of the different pyrolysis conditions on the pyrolysis of gaseous, liquid and solid residue. Found elevated pyrolysis temperature solid residue decreased gas production increased liquid yield almost unchanged. As extraction and column chromatography separation methods, the sludge pyrolysis oil is separated into three components: alkanes, aromatics, polar component, and using gas chromatography - mass spectrometry and other modern analytical techniques, the water phase and the oil phase the each separated fractions were analyzed separately and identification, and achieved satisfactory results. With sludge conversion product with elemental analysis, GC / MS analysis and other means of thermal gravimetric analysis of the sludge and the derived oils, the transfer elements of the conversion reaction process, the temperature, and the reaction mechanism of the transformation characteristics were studied. That the main reaction of the process is the evaporation of the aliphatic compound, the protein peptide bond and the group transfer reaction, the main ingredient is an aliphatic compound and the protein involved in the reaction, wherein the former is involved in the reaction temperature is lower than the latter, while the saccharide compound participate the highest temperature of the reaction. The low temperature pyrolysis of sewage sludge, sludge energy recovery in a development thermochemical processing technology. Pyrolysis of oil and gas has a high calorific value, can be compared with conventional fuels, as fuel is possible that these product. In this study, this process was intermittent experimental studies to determine the highest oil production rate of the reaction conditions and development prospects pointed the sludge pyrolysis liquefaction technology rather.

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