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Post-treatment of dewatered digested sewage sludge by thermophilic high-solid digestion for pasteurization with positive energy output.

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Title: Post-treatment of dewatered digested sewage sludge by thermophilic high-solid digestion for pasteurization with positive energy output.
Authors: Nordell, E.1,2 (AUTHOR) erik.nordell@tekniskaverken.se, Moestedt, J.1,2,3 (AUTHOR), Österman, J.1 (AUTHOR), Shakeri Yekta, S.2,3 (AUTHOR), Björn, A.2,3 (AUTHOR), Sun, L.4 (AUTHOR), Schnürer, A.1,2,3,4 (AUTHOR) anna.schnurer@slu.se
Source: Waste Management. Jan2021, Vol. 119, p11-21. 11p.
Subjects: Sewage sludge, Sewage sludge digestion, Tubular reactors, Food pasteurization, Digestion, Sewage disposal plants
Geographic Terms: Linköping (Sweden)
Abstract: • Thermophilic dry digestion of DDS increases methane yield by 6% • Thermophilic dry digestion of DDS at 52 °C efficiently converts organic N. • Thermophilic dry digestion of DDS is stable at high free ammonia levels (2 g/L) • Increasing ammonia level enriches members of the methanogenic family WSA2. • Sanitization of DDS by thermophilic dry digestion has a positive energy balance. This study investigated the possibility to use thermophilic anaerobic high solid digestion of dewatered digested sewage sludge (DDS) at a wastewater treatment plant (WWTP) as a measure to increase total methane yield, achieve pasteurization and reduce risk for methane emissions during storage of the digestate. A pilot-scale plug-flow reactor was used to mimic thermophilic post-treatment of DDS from a WWTP in Linköping, Sweden. Process operation was evaluated with respect to biogas process performance, using both chemical and microbiological parameters. Initially, the process showed disturbance, with low methane yields and high volatile fatty acid (VFA) accumulation. However, after initiation of digestate recirculation performance improved and the specific methane production reached 46 mL CH 4 /g VS. Plug flow conditions were assessed with lithium chloride and the hydraulic retention time (HRT) was determined to be 19–29 days, sufficient to reach successful pasteurization. Degradation rate of raw protein was high and resulted in ammonia-nitrogen levels of up to 2.0 g/L and a 30% lower protein content in the digestate as compared to DDS. Microbial analysis suggested a shift in the methane producing pathway, with dominance of syntrophic acetate oxidation and the candidate methanogen family WSA2 by the end of the experiment. Energy balance calculations based on annual DDS production of 10 000 ton/year showed that introduction of high-solid digestion as a post-treatment and pasteurization method would result in a positive energy output of 340 MWh/year. Post-digestion of DDS also decreased residual methane potential (RMP) by>96% compared with fresh DDS. [ABSTRACT FROM AUTHOR]
Copyright of Waste Management is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 147460134
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Post-treatment of dewatered digested sewage sludge by thermophilic high-solid digestion for pasteurization with positive energy output.
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  Data: <searchLink fieldCode="AR" term="%22Nordell%2C+E%2E%22">Nordell, E.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> erik.nordell@tekniskaverken.se</i><br /><searchLink fieldCode="AR" term="%22Moestedt%2C+J%2E%22">Moestedt, J.</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Österman%2C+J%2E%22">Österman, J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shakeri+Yekta%2C+S%2E%22">Shakeri Yekta, S.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Björn%2C+A%2E%22">Björn, A.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+L%2E%22">Sun, L.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Schnürer%2C+A%2E%22">Schnürer, A.</searchLink><relatesTo>1,2,3,4</relatesTo> (AUTHOR)<i> anna.schnurer@slu.se</i>
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  Data: <searchLink fieldCode="JN" term="%22Waste+Management%22">Waste Management</searchLink>. Jan2021, Vol. 119, p11-21. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Sewage+sludge%22">Sewage sludge</searchLink><br /><searchLink fieldCode="DE" term="%22Sewage+sludge+digestion%22">Sewage sludge digestion</searchLink><br /><searchLink fieldCode="DE" term="%22Tubular+reactors%22">Tubular reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Food+pasteurization%22">Food pasteurization</searchLink><br /><searchLink fieldCode="DE" term="%22Digestion%22">Digestion</searchLink><br /><searchLink fieldCode="DE" term="%22Sewage+disposal+plants%22">Sewage disposal plants</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Linköping+%28Sweden%29%22">Linköping (Sweden)</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: • Thermophilic dry digestion of DDS increases methane yield by 6% • Thermophilic dry digestion of DDS at 52 °C efficiently converts organic N. • Thermophilic dry digestion of DDS is stable at high free ammonia levels (2 g/L) • Increasing ammonia level enriches members of the methanogenic family WSA2. • Sanitization of DDS by thermophilic dry digestion has a positive energy balance. This study investigated the possibility to use thermophilic anaerobic high solid digestion of dewatered digested sewage sludge (DDS) at a wastewater treatment plant (WWTP) as a measure to increase total methane yield, achieve pasteurization and reduce risk for methane emissions during storage of the digestate. A pilot-scale plug-flow reactor was used to mimic thermophilic post-treatment of DDS from a WWTP in Linköping, Sweden. Process operation was evaluated with respect to biogas process performance, using both chemical and microbiological parameters. Initially, the process showed disturbance, with low methane yields and high volatile fatty acid (VFA) accumulation. However, after initiation of digestate recirculation performance improved and the specific methane production reached 46 mL CH 4 /g VS. Plug flow conditions were assessed with lithium chloride and the hydraulic retention time (HRT) was determined to be 19–29 days, sufficient to reach successful pasteurization. Degradation rate of raw protein was high and resulted in ammonia-nitrogen levels of up to 2.0 g/L and a 30% lower protein content in the digestate as compared to DDS. Microbial analysis suggested a shift in the methane producing pathway, with dominance of syntrophic acetate oxidation and the candidate methanogen family WSA2 by the end of the experiment. Energy balance calculations based on annual DDS production of 10 000 ton/year showed that introduction of high-solid digestion as a post-treatment and pasteurization method would result in a positive energy output of 340 MWh/year. Post-digestion of DDS also decreased residual methane potential (RMP) by>96% compared with fresh DDS. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Waste Management is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.wasman.2020.09.028
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 11
    Subjects:
      – SubjectFull: Sewage sludge
        Type: general
      – SubjectFull: Sewage sludge digestion
        Type: general
      – SubjectFull: Tubular reactors
        Type: general
      – SubjectFull: Food pasteurization
        Type: general
      – SubjectFull: Digestion
        Type: general
      – SubjectFull: Sewage disposal plants
        Type: general
      – SubjectFull: Linköping (Sweden)
        Type: general
    Titles:
      – TitleFull: Post-treatment of dewatered digested sewage sludge by thermophilic high-solid digestion for pasteurization with positive energy output.
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            NameFull: Nordell, E.
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            – D: 01
              M: 01
              Text: Jan2021
              Type: published
              Y: 2021
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              Value: 119
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