Physicochemical properties of product liquid from pyrolysis of sewage sludge

I. Fonts, E. Kuoppala, A. Oasmaa

Research output: Contribution to journalArticleScientificpeer-review

41 Citations (Scopus)

Abstract

Pyrolysis of sewage sludge to produce liquid for fuel use is under study as a promising way to derive value from this waste. The physicochemical properties of such a liquid were studied in this work. The total liquid and organic yields were 49 and 31 wt % of dry ash free feedstock, respectively. The gas and char yields were 32 and 20 wt % of dry ash free feedstock. The liquid was nonhomogenous, dark, bad-smelling, and sticky. By centrifugation, three phases were obtained: 11 v % top, 52 v % middle, and 37 v % bottom phase. The top phase did not contain water, had a high heating value (LHV ) 41.1 MJ kg-1) and the lowest nitrogen and sulfur contents (2.4 and 0.2 wt %) of the three phases. Some nitrogen compounds were water-soluble and could be washed out with water, obtaining a 12% reduction in the nitrogen content. The phase contained mainly alkanes and alkenes (C12-C24), triglycerides, and steroids (C27-C29). It showed miscibility with diesel in the proportion 1:10, indicating good cofiring properties with diesel. The middle phase had the highest water content (34 wt %), and the lowest heating value (LHV ) 15.5 MJ kg-1). It contained mainly water-soluble compounds such as amino-sugars, acids (C3-C9), phenols, nitrogen-containing compounds (some of them with thiol groups), and levoglucosan. The bottom phase had low water content (12 wt %) and high heating value (LHV = 30.6 MJ kg -1). Most of it (57 wt %) was water-insoluble material. It contained phenols, fatty alcohols, nitrogen-containing compounds (some of them with thiol groups), fatty acids (C12-C18), triglycerides, and amino-sugars. In all of the three phases the amount of GC-eluted compounds was low. The high nitrogen and sulfur contents of the middle and bottom phases make their use as a fuel oil difficult without any secondary treatment. These phases could probably be used as fuel for a lime kiln.

Original languageEnglish
Pages (from-to)4121-4128
Number of pages8
JournalEnergy & Fuels
Volume23
Issue number8
DOIs
Publication statusPublished - 20 Aug 2009
MoE publication typeA1 Journal article-refereed

Fingerprint

Sewage sludge
Ashes
Pyrolysis
Nitrogen
Heating
Amino sugars
Water
Liquids
Amino Sugars
Phenols
Sulfur
Sulfhydryl Compounds
Feedstocks
Water content
Triglycerides
Fuel Oils
Fatty Alcohols
Nitrogen Compounds
Sugar Acids
Nitrogen compounds

Keywords

  • sewage sludge
  • pyrolysis
  • pyrolysis liquid
  • waste
  • waste to energy

Cite this

Fonts, I. ; Kuoppala, E. ; Oasmaa, A. / Physicochemical properties of product liquid from pyrolysis of sewage sludge. In: Energy & Fuels. 2009 ; Vol. 23, No. 8. pp. 4121-4128.
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abstract = "Pyrolysis of sewage sludge to produce liquid for fuel use is under study as a promising way to derive value from this waste. The physicochemical properties of such a liquid were studied in this work. The total liquid and organic yields were 49 and 31 wt {\%} of dry ash free feedstock, respectively. The gas and char yields were 32 and 20 wt {\%} of dry ash free feedstock. The liquid was nonhomogenous, dark, bad-smelling, and sticky. By centrifugation, three phases were obtained: 11 v {\%} top, 52 v {\%} middle, and 37 v {\%} bottom phase. The top phase did not contain water, had a high heating value (LHV ) 41.1 MJ kg-1) and the lowest nitrogen and sulfur contents (2.4 and 0.2 wt {\%}) of the three phases. Some nitrogen compounds were water-soluble and could be washed out with water, obtaining a 12{\%} reduction in the nitrogen content. The phase contained mainly alkanes and alkenes (C12-C24), triglycerides, and steroids (C27-C29). It showed miscibility with diesel in the proportion 1:10, indicating good cofiring properties with diesel. The middle phase had the highest water content (34 wt {\%}), and the lowest heating value (LHV ) 15.5 MJ kg-1). It contained mainly water-soluble compounds such as amino-sugars, acids (C3-C9), phenols, nitrogen-containing compounds (some of them with thiol groups), and levoglucosan. The bottom phase had low water content (12 wt {\%}) and high heating value (LHV = 30.6 MJ kg -1). Most of it (57 wt {\%}) was water-insoluble material. It contained phenols, fatty alcohols, nitrogen-containing compounds (some of them with thiol groups), fatty acids (C12-C18), triglycerides, and amino-sugars. In all of the three phases the amount of GC-eluted compounds was low. The high nitrogen and sulfur contents of the middle and bottom phases make their use as a fuel oil difficult without any secondary treatment. These phases could probably be used as fuel for a lime kiln.",
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Physicochemical properties of product liquid from pyrolysis of sewage sludge. / Fonts, I.; Kuoppala, E.; Oasmaa, A.

In: Energy & Fuels, Vol. 23, No. 8, 20.08.2009, p. 4121-4128.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Physicochemical properties of product liquid from pyrolysis of sewage sludge

AU - Fonts, I.

AU - Kuoppala, E.

AU - Oasmaa, A.

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Y1 - 2009/8/20

N2 - Pyrolysis of sewage sludge to produce liquid for fuel use is under study as a promising way to derive value from this waste. The physicochemical properties of such a liquid were studied in this work. The total liquid and organic yields were 49 and 31 wt % of dry ash free feedstock, respectively. The gas and char yields were 32 and 20 wt % of dry ash free feedstock. The liquid was nonhomogenous, dark, bad-smelling, and sticky. By centrifugation, three phases were obtained: 11 v % top, 52 v % middle, and 37 v % bottom phase. The top phase did not contain water, had a high heating value (LHV ) 41.1 MJ kg-1) and the lowest nitrogen and sulfur contents (2.4 and 0.2 wt %) of the three phases. Some nitrogen compounds were water-soluble and could be washed out with water, obtaining a 12% reduction in the nitrogen content. The phase contained mainly alkanes and alkenes (C12-C24), triglycerides, and steroids (C27-C29). It showed miscibility with diesel in the proportion 1:10, indicating good cofiring properties with diesel. The middle phase had the highest water content (34 wt %), and the lowest heating value (LHV ) 15.5 MJ kg-1). It contained mainly water-soluble compounds such as amino-sugars, acids (C3-C9), phenols, nitrogen-containing compounds (some of them with thiol groups), and levoglucosan. The bottom phase had low water content (12 wt %) and high heating value (LHV = 30.6 MJ kg -1). Most of it (57 wt %) was water-insoluble material. It contained phenols, fatty alcohols, nitrogen-containing compounds (some of them with thiol groups), fatty acids (C12-C18), triglycerides, and amino-sugars. In all of the three phases the amount of GC-eluted compounds was low. The high nitrogen and sulfur contents of the middle and bottom phases make their use as a fuel oil difficult without any secondary treatment. These phases could probably be used as fuel for a lime kiln.

AB - Pyrolysis of sewage sludge to produce liquid for fuel use is under study as a promising way to derive value from this waste. The physicochemical properties of such a liquid were studied in this work. The total liquid and organic yields were 49 and 31 wt % of dry ash free feedstock, respectively. The gas and char yields were 32 and 20 wt % of dry ash free feedstock. The liquid was nonhomogenous, dark, bad-smelling, and sticky. By centrifugation, three phases were obtained: 11 v % top, 52 v % middle, and 37 v % bottom phase. The top phase did not contain water, had a high heating value (LHV ) 41.1 MJ kg-1) and the lowest nitrogen and sulfur contents (2.4 and 0.2 wt %) of the three phases. Some nitrogen compounds were water-soluble and could be washed out with water, obtaining a 12% reduction in the nitrogen content. The phase contained mainly alkanes and alkenes (C12-C24), triglycerides, and steroids (C27-C29). It showed miscibility with diesel in the proportion 1:10, indicating good cofiring properties with diesel. The middle phase had the highest water content (34 wt %), and the lowest heating value (LHV ) 15.5 MJ kg-1). It contained mainly water-soluble compounds such as amino-sugars, acids (C3-C9), phenols, nitrogen-containing compounds (some of them with thiol groups), and levoglucosan. The bottom phase had low water content (12 wt %) and high heating value (LHV = 30.6 MJ kg -1). Most of it (57 wt %) was water-insoluble material. It contained phenols, fatty alcohols, nitrogen-containing compounds (some of them with thiol groups), fatty acids (C12-C18), triglycerides, and amino-sugars. In all of the three phases the amount of GC-eluted compounds was low. The high nitrogen and sulfur contents of the middle and bottom phases make their use as a fuel oil difficult without any secondary treatment. These phases could probably be used as fuel for a lime kiln.

KW - sewage sludge

KW - pyrolysis

KW - pyrolysis liquid

KW - waste

KW - waste to energy

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