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Anaerobic Digestion of the Halophyte Salicornia ramosissima in Co-Digestion with Swine Manure in Lab-Scale Batch and Continuous Reactor Tests.

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Title: Anaerobic Digestion of the Halophyte Salicornia ramosissima in Co-Digestion with Swine Manure in Lab-Scale Batch and Continuous Reactor Tests.
Authors: Cayenne, Aadila1 (AUTHOR), Uellendahl, Hinrich1 (AUTHOR) hinrich.uellendahl@hs-flensburg.de
Source: Energies (19961073). Jun2025, Vol. 18 Issue 12, p3085. 17p.
Subjects: Swine manure, Batch reactors, Continuous processing, Renewable natural gas, RF values (Chromatography), Anaerobic digestion
Abstract: This laboratory study investigated the anaerobic co-digestion process of the halophyte S. ramosissima (Sram) together with swine manure (SM) in different mixing ratios in batch and continuous reactor experiments. In the batch experiments, a methane yield of 214 mLCH4·gVS−1 was obtained for Sram in mono-digestion. In co-digestion with SM, the methane yields were slightly higher than calculated from the yields of each substrate in mono-digestion. Also, the kinetic rate constant in the co-digestion with swine manure increased from 0.219 d−1 for mono-digested S. ramosissima to 0.318 d−1 in the co-digestion of 50:50 Sram:SM (based on VS). Two continuous 5 L lab-scale CSTR reactors were operated: one as a control (100% SM) and the other as a co-digestion reactor with an increasing VS share of Sram (15, 25, and 35%) in the feed. Both reactors were operated at an organic loading rate (OLR) of 2.5 gVS.L−1·d−1 and a hydraulic retention time (HRT) of 20 days. In the continuous process, the highest methane yield of 276 mLCH4·gVS−1 was achieved at a co-digestion VS ratio of Sram:SM 25:75, corresponding to a methane yield from the added S. ramosissima of 277 mLCH4·gVS−1. This showed successful operation of the continuous co-digestion process of S. ramosissima and swine manure, with higher methane yields of S. ramosissima than in the mono-digestion batch tests. [ABSTRACT FROM AUTHOR]
Copyright of Energies (19961073) is the property of MDPI 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.)
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  Data: Anaerobic Digestion of the Halophyte Salicornia ramosissima in Co-Digestion with Swine Manure in Lab-Scale Batch and Continuous Reactor Tests.
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  Data: <searchLink fieldCode="AR" term="%22Cayenne%2C+Aadila%22">Cayenne, Aadila</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Uellendahl%2C+Hinrich%22">Uellendahl, Hinrich</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hinrich.uellendahl@hs-flensburg.de</i>
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  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Jun2025, Vol. 18 Issue 12, p3085. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Swine+manure%22">Swine manure</searchLink><br /><searchLink fieldCode="DE" term="%22Batch+reactors%22">Batch reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Continuous+processing%22">Continuous processing</searchLink><br /><searchLink fieldCode="DE" term="%22Renewable+natural+gas%22">Renewable natural gas</searchLink><br /><searchLink fieldCode="DE" term="%22RF+values+%28Chromatography%29%22">RF values (Chromatography)</searchLink><br /><searchLink fieldCode="DE" term="%22Anaerobic+digestion%22">Anaerobic digestion</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: This laboratory study investigated the anaerobic co-digestion process of the halophyte S. ramosissima (Sram) together with swine manure (SM) in different mixing ratios in batch and continuous reactor experiments. In the batch experiments, a methane yield of 214 mLCH4·gVS−1 was obtained for Sram in mono-digestion. In co-digestion with SM, the methane yields were slightly higher than calculated from the yields of each substrate in mono-digestion. Also, the kinetic rate constant in the co-digestion with swine manure increased from 0.219 d−1 for mono-digested S. ramosissima to 0.318 d−1 in the co-digestion of 50:50 Sram:SM (based on VS). Two continuous 5 L lab-scale CSTR reactors were operated: one as a control (100% SM) and the other as a co-digestion reactor with an increasing VS share of Sram (15, 25, and 35%) in the feed. Both reactors were operated at an organic loading rate (OLR) of 2.5 gVS.L−1·d−1 and a hydraulic retention time (HRT) of 20 days. In the continuous process, the highest methane yield of 276 mLCH4·gVS−1 was achieved at a co-digestion VS ratio of Sram:SM 25:75, corresponding to a methane yield from the added S. ramosissima of 277 mLCH4·gVS−1. This showed successful operation of the continuous co-digestion process of S. ramosissima and swine manure, with higher methane yields of S. ramosissima than in the mono-digestion batch tests. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Energies (19961073) is the property of MDPI 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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      – SubjectFull: Continuous processing
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              Text: Jun2025
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              Y: 2025
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