Thermal behaviour of sewage sludge in pyrolysis process

Linghu, Wen Sheng; Shen, Runpu

doi:10.1179/1432891714z.000000000645

Cited by 5 publications

(4 citation statements)

References 18 publications

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Section: Resultsmentioning

confidence: 99%

“…The second, third, and fourth stages of oily sludge pyrolysis accounted for a large proportion and were the main components of oily sludge weight loss. In these stages, the organic matter in the oily sludge volatilized directly, or some macromolecular organic matter volatilized after pyrolysis reaction to form components with relatively small molecular weight …”

Section: Resultsmentioning

confidence: 99%

“…In these stages, the organic matter in the oily sludge volatilized directly, or some macromolecular organic matter volatilized after pyrolysis reaction to form components with relatively small molecular weight. 34 DTG curve showed that there was a large peak in the second stage of oily sludge pyrolysis. This stage was a rapid weight loss stage of pyrolysis, which mainly comes from the volatilization of low boiling point hydrocarbons.…”

Section: Resultsmentioning

confidence: 99%

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Analysis of Pyrolysis Characteristics of Oily Sludge in Different Regions and Environmental Risk Assessment of Heavy Metals in Pyrolysis Residue

Wang

Zhao

et al. 2022

ACS Omega

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As a resource treatment method, pyrolysis realizes the recovery of oil and immobilization of heavy metals in oily sludge (OS). The results showed that the composition of OS had little effect on the trend of the whole pyrolysis process, but it had different effects on the mass loss and maximum weight loss rate at each pyrolysis stage. SEM–EDS results showed that the pyrolysis residue had a porous internal structure, which was similar to that of activated carbon. The elements S, Ca, O, Fe, Al, and Si were embedded in the carbon skeleton. After OS pyrolysis, the oil content of the solid residue was far less than 2%, which met the pollution control requirements for comprehensive utilization specified in China’s oil and gas industry standard. At the same time, the ratio of exchangeable fraction decreased and the ratio of residual fraction increased after OS pyrolysis. The potential ecological hazard coefficient ( E r ) of Cd in OS2, OS2-500, and OS2-600 was greater than 40, which were strong and medium hazards. The E r values of OS2-700 and other metals were far lower than 40, which were low hazards. With the increase of pyrolysis temperature, the comprehensive ecological hazard index (RI) of heavy metals in the residue gradually decreased and the RI value of OS2-700 decreased to 28.01. Therefore, the pyrolysis residue had an internal porous structure and controllable environmental risk. It could be used as an adsorption material for heavy metals to realize the comprehensive utilization of OS.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Analysis of Pyrolysis Characteristics of Oily Sludge in Different Regions and Environmental Risk Assessment of Heavy Metals in Pyrolysis Residue

Wang

Zhao

et al. 2022

ACS Omega

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“…Temperatures, heating rates and some other reaction conditions have deep impacts on the composition and yield of sludge products. (Linghu and Shen, 2014) discussed the effects of heating rate, metal oxide addition and pyrolysis temperature on the thermal behavior of three different kinds of sewage sludge with a thermogravimetric analyzer and a fixed bed reactor. (Inguanzo et al, 2002) studied the characteristics of gases, liquids and solid residues of sewage sludge under different heating rates and final temperatures of pyrolysis and then revealed the energy value of these products.…”

Section: Introductionmentioning

confidence: 99%

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The thermal treatment of oil sludge involves lots of complex and parallel reactions. Detailed analysis about such a process is difficult and limited. Therefore, the combustion and pyrolysis characteristics of a few representative sludge samples were studied through TG-FTIR at different atmospheres in this work. As it is found there is much difference. The oil sludge from Shengli Oil Field contains less moisture and more oil composition compared with that from Liaohe Oil Field. This indicated that the sludge from Shengli Oil Field can be effectively converted into fuels or primary chemicals. Besides, oxygen has a very serious impact on the thermal conversion process of oil sludge. Ambient conditions with an increase of oxygen concentration can oxide the oil sludge at low temperature range; What's more, different oxygen concentrations distinguished the maximum weight loss rate and its corresponding temperature. The FTIR analyses of the gaseous products from the combustion and pyrolysis processes showed that CO, CO2, CH4, H2O and some volatile organic compounds (e.g. aldehydes and carboxylic acids) are the main thermal degradation compounds. The composition of gaseous compounds changed with oxygen concentration. Specifically, CO2 accounted for a larger proportion with the increase of oxygen concentration. Obtained dynamic parameters along with the pyrolysis and combustion processes were hard to find regularly. Nevertheless, the apparent activation energy in third stage in which the major weight loss is the decomposition of char increased as the oxygen concentration increased.

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Pyrolysis of pre-dried dewatered sewage sludge under different heating rates: Characteristics and kinetics study

Zhu

Zhao

et al. 2019

Fuel

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Thermal behaviour of sewage sludge in pyrolysis process

Cited by 5 publications

References 18 publications

Analysis of Pyrolysis Characteristics of Oily Sludge in Different Regions and Environmental Risk Assessment of Heavy Metals in Pyrolysis Residue

Analysis of Pyrolysis Characteristics of Oily Sludge in Different Regions and Environmental Risk Assessment of Heavy Metals in Pyrolysis Residue

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Pyrolysis of pre-dried dewatered sewage sludge under different heating rates: Characteristics and kinetics study

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