View in EDS HTML Full Text PDF Full Text

Anaerobic Digester Installation Significantly Reduces Liquid Manure Management CH4 Emissions at a California Dairy Farm.

Saved in:
Bibliographic Details
Title: Anaerobic Digester Installation Significantly Reduces Liquid Manure Management CH4 Emissions at a California Dairy Farm.
Authors: Rodriguez, Michael V.1 (AUTHOR) mrodr149@ucr.edu, Robles, Nidia Rojas1 (AUTHOR), Carranza, Valerie1 (AUTHOR), Thiruvenkatachari, Ranga2 (AUTHOR), Reyes, Mariana1 (AUTHOR), Preble, Chelsea V.3,4 (AUTHOR), Pexton, Joyce5 (AUTHOR), Meyer, Deanne5 (AUTHOR), Anderson, Ray G.1,6 (AUTHOR), Venkatram, Akula2 (AUTHOR), Hopkins, Francesca M.1 (AUTHOR)
Source: GCB Bioenergy. Jul2025, Vol. 17 Issue 7, p1-12. 12p.
Subject Terms: *Climate change mitigation, *Agricultural pollution, *Anaerobic digestion, Settling basins, Mole fraction
Abstract: Anaerobic digesters are expected to significantly reduce CH4 emissions from dairy manure management by capturing them for use as biogas. Anaerobic digestion is the current major mitigation strategy for agricultural CH4 emissions in California's climate policy. However, verification of the effectiveness of anaerobic digesters to reduce CH4 emissions has not been conducted at scale in California. We made atmospheric measurements from a mobile platform and used dispersion modeling to estimate CH4 emissions from a liquid manure storage complex at a typical California dairy before and after digester installation across nine field campaigns. The anaerobic digester reduced CH4 emissions by an average of 82% ± 16%, comparing paired months to predigester values. Prior to the digester, atmospheric CH4 mole fractions showed a persistent hotspot near the manure settling basin cells of 28.6 ± 8.9 ppm. After the digester, atmospheric CH4 mole fractions from manure storage were greatly reduced. We observed strong temporal variability across measurement campaigns due to weather, on‐farm management practices, and digester operations. Estimated emissions greatly exceeded those based on inventory calculations used by the California Air Resources Board (CARB) but were in line with expected relative emissions reduction from digester installation. Scaling these results to 139 dairies with digester projects statewide suggests that similarly operating digesters would reduce CH4 emissions by 1.6 ± 0.3 MMT CO2e (65 ± 12 Gg CH4), 39% of the emissions reduction goal for livestock manure management set by California law. This work demonstrates the effectiveness of anaerobic digesters to reduce dairy manure management CH4 emissions in practice, along with the importance of understanding operations and management for interpreting on‐farm CH4 emissions studies. [ABSTRACT FROM AUTHOR]
Copyright of GCB Bioenergy is the property of Wiley-Blackwell 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: GreenFILE
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: 8gh
DbLabel: GreenFILE
An: 186252986
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Anaerobic Digester Installation Significantly Reduces Liquid Manure Management CH<subscript>4</subscript> Emissions at a California Dairy Farm.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Rodriguez%2C+Michael+V%2E%22">Rodriguez, Michael V.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mrodr149@ucr.edu</i><br /><searchLink fieldCode="AR" term="%22Robles%2C+Nidia+Rojas%22">Robles, Nidia Rojas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Carranza%2C+Valerie%22">Carranza, Valerie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Thiruvenkatachari%2C+Ranga%22">Thiruvenkatachari, Ranga</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Reyes%2C+Mariana%22">Reyes, Mariana</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Preble%2C+Chelsea+V%2E%22">Preble, Chelsea V.</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pexton%2C+Joyce%22">Pexton, Joyce</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Meyer%2C+Deanne%22">Meyer, Deanne</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Anderson%2C+Ray+G%2E%22">Anderson, Ray G.</searchLink><relatesTo>1,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Venkatram%2C+Akula%22">Venkatram, Akula</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hopkins%2C+Francesca+M%2E%22">Hopkins, Francesca M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22GCB+Bioenergy%22">GCB Bioenergy</searchLink>. Jul2025, Vol. 17 Issue 7, p1-12. 12p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Climate+change+mitigation%22">Climate change mitigation</searchLink><br />*<searchLink fieldCode="DE" term="%22Agricultural+pollution%22">Agricultural pollution</searchLink><br />*<searchLink fieldCode="DE" term="%22Anaerobic+digestion%22">Anaerobic digestion</searchLink><br /><searchLink fieldCode="DE" term="%22Settling+basins%22">Settling basins</searchLink><br /><searchLink fieldCode="DE" term="%22Mole+fraction%22">Mole fraction</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Anaerobic digesters are expected to significantly reduce CH4 emissions from dairy manure management by capturing them for use as biogas. Anaerobic digestion is the current major mitigation strategy for agricultural CH4 emissions in California's climate policy. However, verification of the effectiveness of anaerobic digesters to reduce CH4 emissions has not been conducted at scale in California. We made atmospheric measurements from a mobile platform and used dispersion modeling to estimate CH4 emissions from a liquid manure storage complex at a typical California dairy before and after digester installation across nine field campaigns. The anaerobic digester reduced CH4 emissions by an average of 82% ± 16%, comparing paired months to predigester values. Prior to the digester, atmospheric CH4 mole fractions showed a persistent hotspot near the manure settling basin cells of 28.6 ± 8.9 ppm. After the digester, atmospheric CH4 mole fractions from manure storage were greatly reduced. We observed strong temporal variability across measurement campaigns due to weather, on‐farm management practices, and digester operations. Estimated emissions greatly exceeded those based on inventory calculations used by the California Air Resources Board (CARB) but were in line with expected relative emissions reduction from digester installation. Scaling these results to 139 dairies with digester projects statewide suggests that similarly operating digesters would reduce CH4 emissions by 1.6 ± 0.3 MMT CO2e (65 ± 12 Gg CH4), 39% of the emissions reduction goal for livestock manure management set by California law. This work demonstrates the effectiveness of anaerobic digesters to reduce dairy manure management CH4 emissions in practice, along with the importance of understanding operations and management for interpreting on‐farm CH4 emissions studies. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of GCB Bioenergy is the property of Wiley-Blackwell 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=8gh&AN=186252986
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1111/gcbb.70047
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 1
    Subjects:
      – SubjectFull: Climate change mitigation
        Type: general
      – SubjectFull: Agricultural pollution
        Type: general
      – SubjectFull: Anaerobic digestion
        Type: general
      – SubjectFull: Settling basins
        Type: general
      – SubjectFull: Mole fraction
        Type: general
    Titles:
      – TitleFull: Anaerobic Digester Installation Significantly Reduces Liquid Manure Management CH4 Emissions at a California Dairy Farm.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Rodriguez, Michael V.
      – PersonEntity:
          Name:
            NameFull: Robles, Nidia Rojas
      – PersonEntity:
          Name:
            NameFull: Carranza, Valerie
      – PersonEntity:
          Name:
            NameFull: Thiruvenkatachari, Ranga
      – PersonEntity:
          Name:
            NameFull: Reyes, Mariana
      – PersonEntity:
          Name:
            NameFull: Preble, Chelsea V.
      – PersonEntity:
          Name:
            NameFull: Pexton, Joyce
      – PersonEntity:
          Name:
            NameFull: Meyer, Deanne
      – PersonEntity:
          Name:
            NameFull: Anderson, Ray G.
      – PersonEntity:
          Name:
            NameFull: Venkatram, Akula
      – PersonEntity:
          Name:
            NameFull: Hopkins, Francesca M.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 07
              Text: Jul2025
              Type: published
              Y: 2025
          Identifiers:
            – Type: issn-print
              Value: 17571693
          Numbering:
            – Type: volume
              Value: 17
            – Type: issue
              Value: 7
          Titles:
            – TitleFull: GCB Bioenergy
              Type: main
ResultId 1