Surface area development of sewage sludge during pyrolysis

Lü, Guang; Low, J.C.F.; Liu, C.Y.; Lua, Aik Chong

doi:10.1016/0016-2361(95)93465-p

Cited by 169 publications

(66 citation statements)

References 11 publications

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“…Microporosity analysis stated in Table 2 is in good agreement with those data. Lu et al (1995) claimed that microporosity was reduced for chars obtained at 550-650°C, possibly due to the pore enlargement phenomenon as a result of loss of volatiles in the intermediate thermoplastic phase. Data in Table 2 have also revealed that hydrothermal pretreatment may also have a synergic effect on enlargement of P/P 0, BET and L (?18,?73 and ?63 %,respectively) surface area.…”

Section: Resultsmentioning

confidence: 99%

Appraisal of changes in sewage sludge management

Vochоzka

Maroušková

Váchal

et al. 2016

Int. J. Environ. Sci. Technol.

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A positive energy balance caused by accelerated production of CH 4 and additional financial benefits associated with shorter retention times, reduction in volumes, easier dewatering, enhanced hygiene, etc., are the reasons why most modern wastewater treatment plants are newly equipped with hydrothermal pretreatment units. This study examined how the changes in composition of the pretreated sewage sludge fermentation residues manifested themselves in subsequent processing by pyrolysis, both in terms of technology and financial impacts. It has been found that concentrations of heavy metals and other hazardous inhibitors might increase; however, the overall biotoxicity is lower due to their immobilization in the charred mass. Moreover, charring of the fermentation residues results in significant financial as well as technological benefits.

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Section: Resultsmentioning

confidence: 99%

Appraisal of changes in sewage sludge management

Vochоzka

Maroušková

Váchal

et al. 2016

Int. J. Environ. Sci. Technol.

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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.…”

Section: Discussionmentioning

confidence: 99%

“…The resultant adsorbents have potential for use in industrial air pollution control and odor removal from sewage treatment processes. 3 The literature seldom analyzes volatile organic compounds (VOCs) in the exhaust gas and elemental composition of sludge residue. In this study, pyrolysis of the petrochemical industrial sludge was carried out in a nitrogen atmosphere.…”

Section: Discussionmentioning

confidence: 99%

“…The pyrolysis equipment was set up and is shown in Figure 1. The pyrolysis temperature and the sample residence time varied from 673 to 1073 K (673, 773, 873, 973, and 1073 K) and from 1 to 60 min (1,3,5,10,15,20,30, and 60 min), respectively. After the pyrolysis process, the reactor was cooled down to room temperature before the pyrolysis residue was removed for quantification and characterization.…”

Section: Pyrolysis Processmentioning

confidence: 99%

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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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“…Such optimum activation temperature was selected because the highest value was seen at 750 o C at the time of analyzing iodine adsorptivity, but because BET specific surface area was the highest (288.28 m 2 /g) at 500 o C at the time of analyzing nitrogen adsorption in accordance with the changes of activation temperature in Table 5. The decrease in adsorptivity is caused by the solution of intermediate products by the emission of the second volatile matter [16], at the activation temperature above 500 o C, but by the contraction and sintering by high activation temperature, at the activation temperature above 750 o C. In addition, activation temperature has maximum influence on adsorbent yield. Fig.…”

Section: Ii-2 Parametric Screening Studiesmentioning

confidence: 99%

Characteristics on Carbonization and Steam Activation of Sewage Sludge

Jung¹,

Chun²

2009

Open Proc Chem J

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A number of methods are presented to treat sewage sludge. However, the sludge treated in each treatment process has a problem of heavy metal elution. Currently, the treatment of sewage sludge through carbonization is highlighted to solve such problem. This study carried out research of optimum carbonization and activation condition and analysis of adsorption characteristics in order to treat sewage sludge through carbonization and steam activation and to cycle it as activated carbon. The optimum carbonization and activation conditions were achieved through variable studies and based on iodine adsorptivity. In addition, an analysis was performed with nitrogen adsorption and a SEM to confirm adsorption characteristics and pore development. The results showed that the adsorption capacity of activated derived from sewage (hereinafter referred to as "activated carbon") is improved and porosity is formed through carbonization and steam activation. In particular, micropore is mostly developed by steam activation.

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Surface area development of sewage sludge during pyrolysis

Cited by 169 publications

References 11 publications

Appraisal of changes in sewage sludge management

Appraisal of changes in sewage sludge management

Pyrolysis Kinetics and Residue Characteristics of Petrochemical Industrial Sludge

Characteristics on Carbonization and Steam Activation of Sewage Sludge

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