Kinetic studies of the pyrolysis of sewage sludge by tga and comparison with fluidized beds

Dümpelmann, R.; Richarz, Werner; Stammbach, Marc R.

doi:10.1002/cjce.5450690418

Cited by 47 publications

(24 citation statements)

References 17 publications

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“…These high reaction orders may have resulted from the use of a simple global reaction kinetic model to ®t a large number of reactions over a wide temperature range, as in the pyrolysis of sewage sludges. 18 The proposed model in this paper gives a reasonable reaction order by the use of a simple global reaction kinetic model for describing the pyrolysis of oil sludge and satisfactorily agrees with the experimental results.…”

Section: Reaction Order and Frequency Factorsupporting

confidence: 63%

See 1 more Smart Citation

Resources recovery of oil sludge by pyrolysis: kinetics study

Shie

Chang

Lin

et al. 2000

J. Chem. Technol. Biotechnol.

104

103

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Oil sludge, if unused, is one of the major industrial wastes requiring treatment from petroleum re®nery plants or the petrochemical industry. It contains a large amount of combustibles with high heating values. The treatment of waste oil sludge by burning has certain bene®ts; however, it cannot provide the useful resource ef®ciently. On the other hand, the conversion of oil sludge to lower molecular weight organic compounds by pyrolysis not only solves the disposal problem but also has the appeal of resource utilization. The major sources of oil sludge include the oil storage tank sludge, the biological sludge, the dissolve air¯otation (DAF) scum, the American Petroleum Institute (API) separator sludge and the chemical sludge. In this study, the oil sludge from the oil storage tank of a typical petroleum re®nery plant located in northern Taiwan is used as the raw material of pyrolysis. Its heating value of dry basis and low heating value of wet basis are about 10681 kcal kg À1 and 5870 kcal kg À1 , respectively. The removal of the moisture from oil sludge signi®cantly increases its heating value. The pyrolysis of oil sludge is conducted by the use of nitrogen as the carrier gas in the temperature range of 380±1073 K and at various constant heating rates of 5.2, 12.8 and 21.8 K min À1 . The pyrolytic reaction is signi®cant at 450±800 K and complex. For the sake of simplicity and engineering use, a onereaction kinetic model is proposed for the pyrolysis of oil sludge, and is found to satisfactorily ®t the experimental data. The activation energy, reaction order and frequency factor of the corresponding pyrolysis reaction in nitrogen for oil sludge are 78.22 kJ mol À1 , 2.92 and 9.48 Â 10 5 min À1 , respectively. For precise use, the two-and three-reaction models are proposed to describe the pyrolysis results. Among the three models proposed, the three-reaction model gives the best ®t. These results are very useful for the proper design of the pyrolysis system of the oil sludge under investigation.

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Section: Reaction Order and Frequency Factorsupporting

confidence: 63%

“…However, the model did not ®t the data adequately at other heating rates. Dumpelmann et al 18 used two main global reaction domains to describe the pyrolysis of sewage sludge, which was anaerobically stabilized with phosphorus removal. Each global reaction has two competitive reactions.…”

Section: Notation Amentioning

confidence: 99%

Resources recovery of oil sludge by pyrolysis: kinetics study

Shie

Chang

Lin

et al. 2000

J. Chem. Technol. Biotechnol.

104

103

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“…2 Disposal of sludge on reclaimed land is no longer a viable solution, 3 while farmland applications of sludge are limited by the uptake capacity of the soil and the potential pollution by heavy metals. 4 Incineration can provide a large-volume reduction and energy recovery in sludge disposal. 5 Its residue can be used in road surfacing, building materials, and metal reclamation.…”

Section: Discussionmentioning

confidence: 99%

Pyrolysis Kinetics and Residue Characteristics of Petrochemical Industrial Sludge

Chiang

Tsai

et al. 2000

Journal of the Air & Waste Management Association

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This study investigated the pyrolysis characteristics of sludge from wastewater treatment plants in the petrochemical industry and focused on the pyrolysis kinetics, elemental composition of residue, and volatile organic compounds (VOCs) of exhaust gas. As pyrolysis temperature increased to 773 K, the increasing rate of crude oil production tended to a stable condition. The result indicated that the optimal temperature of crude oil and water mixed production was 773 K. When pyrolysis temperature increased from 673 to 973 K, carbon, oxygen, nitrogen, and hydrogen concentrations of residue decreased and the sulfur concentration of residue increased. The concentrations of benzene, toluene, ethylbenzene, and styrene increased by the increasing pyrolysis temperature. We found that the reaction order of sludge pyrolysis was 2.5 and the activation energy of the reaction was 11.06 kJ/mol. We believe that our pyrolysis system is transitional between devolatilization and combustion.

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“…In particular, TG can monitor the sample mass of substance as a function of temperature and/or time, whereas DTG is an approach performed by detecting the rate of mass loss. These two approaches have been used recently in thermal degradation of biomass samples (Eero, 1981;Jakab et al, 1997;Meszaros et al, 2007;Sebestyén et al, 2011;Shafizadeh, 1968;Varhegyi et al, 1988;Villanueva et al, 2011;Wilson et al, 2011), investigations of sewage sludge pyrolysis (Dumpelmann et al, 1991;Magdziarz and Werle, 2014), and combustion (Font et al, 2001;Magdziarz and Wilk, 2013), as well as co-combustion of sewage sludge and other substances (Otero et al, 2002;Park and Jang, 2011;Yu and Li, 2014). Operation parameters of SCPs, such as temperature and atmosphere conditions, were also evaluated using both TG and DTG approaches (Calvo et al, 2013;Manara and Zabaniotou, 2012).…”

Section: Introductionmentioning

confidence: 99%

Consequences of sludge composition on combustion performance derived from thermogravimetry analysis

Xiao

Wang

et al. 2015

Waste Management

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a b s t r a c tWastewater treatment plants produce millions of tons of sewage sludge. Sewage sludge is recognized as a promising feedstock for power generation via combustion and can be used for energy crisis adaption. We aimed to investigate the quantitative effects of various sludge characteristics on the overall sludge combustion process performance. Different types of sewage sludge were derived from numerous wastewater treatment plants in Beijing for further thermogravimetric analysis. Thermogravimetric-differential thermogravimetric curves were used to compare the performance of the studied samples. Proximate analytical data, organic compositions, elementary composition, and calorific value of the samples were determined. The relationship between combustion performance and sludge composition was also investigated. Results showed that the performance of sludge combustion was significantly affected by the concentration of protein, which is the main component of volatiles. Carbohydrates and lipids were not correlated with combustion performance, unlike protein. Overall, combustion performance varied with different sludge organic composition. The combustion rate of carbohydrates was higher than those of protein and lipid, and carbohydrate weight loss mainly occurred during the second stage (175-300°C).Carbohydrates have a substantial effect on the rate of system combustion during the second stage considering the specific combustion feature. Additionally, the combustion performance of digested sewage sludge is more negative than the others.

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Kinetic studies of the pyrolysis of sewage sludge by tga and comparison with fluidized beds

Cited by 47 publications

References 17 publications

Resources recovery of oil sludge by pyrolysis: kinetics study

Resources recovery of oil sludge by pyrolysis: kinetics study

Pyrolysis Kinetics and Residue Characteristics of Petrochemical Industrial Sludge

Consequences of sludge composition on combustion performance derived from thermogravimetry analysis

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