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Anaerobic co-digestion of Tunisian green macroalgae Ulva rigida with sugar industry wastewater for biogas and methane production enhancement.

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Title: Anaerobic co-digestion of Tunisian green macroalgae Ulva rigida with sugar industry wastewater for biogas and methane production enhancement.
Authors: Karray, Raida1, Karray, Fatma1, Loukil, Slim1, Mhiri, Najla1, Sayadi, Sami1 sami.sayadi@gmail.com
Source: Waste Management. Mar2017, Vol. 61, p171-178. 8p.
Subjects: Anaerobic digestion, Microalgae, Ulva, Sugar industry, Wastewater treatment, Biogas production, Farm manure in methane production
Abstract: Ulva rigida is a green macroalgae, abundantly available in the Mediterranean which offers a promising source for the production of valuable biomaterials, including methane. In this study, anaerobic digestion assays in a batch mode was performed to investigate the effects of various inocula as a mixture of fresh algae, bacteria, fungi and sediment collected from the coast of Sfax, on biogas production from Ulva rigida . The results revealed that the best inoculum to produce biogas and feed an anaerobic reactor is obtained through mixing decomposed macroalgae with anaerobic sludge and water, yielding into 408 mL of biogas. The process was then investigated in a sequencing batch reactor (SBR) which led to an overall biogas production of 375 mL with 40% of methane. Further co-digestion studies were performed in an anaerobic up-flow bioreactor using sugar wastewater as a co-substrate. A high biogas production yield of 114 mL g −1 VS added was obtained with 75% of methane. The co-digestion proposed in this work allowed the recovery of natural methane, providing a promising alternative to conventional anaerobic microbial fermentation using Tunisian green macroalgae. Finally, in order to identify the microbial diversity present in the reactor during anaerobic digestion of Ulva rigida , the prokaryotic diversity was investigated in this bioreactor by the denaturing gradient gel electrophoresis (DGGE) method targeting the 16S rRNA gene. [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: 121938202
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Anaerobic co-digestion of Tunisian green macroalgae Ulva rigida with sugar industry wastewater for biogas and methane production enhancement.
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  Data: <searchLink fieldCode="AR" term="%22Karray%2C+Raida%22">Karray, Raida</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Karray%2C+Fatma%22">Karray, Fatma</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Loukil%2C+Slim%22">Loukil, Slim</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mhiri%2C+Najla%22">Mhiri, Najla</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sayadi%2C+Sami%22">Sayadi, Sami</searchLink><relatesTo>1</relatesTo><i> sami.sayadi@gmail.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Waste+Management%22">Waste Management</searchLink>. Mar2017, Vol. 61, p171-178. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Anaerobic+digestion%22">Anaerobic digestion</searchLink><br /><searchLink fieldCode="DE" term="%22Microalgae%22">Microalgae</searchLink><br /><searchLink fieldCode="DE" term="%22Ulva%22">Ulva</searchLink><br /><searchLink fieldCode="DE" term="%22Sugar+industry%22">Sugar industry</searchLink><br /><searchLink fieldCode="DE" term="%22Wastewater+treatment%22">Wastewater treatment</searchLink><br /><searchLink fieldCode="DE" term="%22Biogas+production%22">Biogas production</searchLink><br /><searchLink fieldCode="DE" term="%22Farm+manure+in+methane+production%22">Farm manure in methane production</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Ulva rigida is a green macroalgae, abundantly available in the Mediterranean which offers a promising source for the production of valuable biomaterials, including methane. In this study, anaerobic digestion assays in a batch mode was performed to investigate the effects of various inocula as a mixture of fresh algae, bacteria, fungi and sediment collected from the coast of Sfax, on biogas production from Ulva rigida . The results revealed that the best inoculum to produce biogas and feed an anaerobic reactor is obtained through mixing decomposed macroalgae with anaerobic sludge and water, yielding into 408 mL of biogas. The process was then investigated in a sequencing batch reactor (SBR) which led to an overall biogas production of 375 mL with 40% of methane. Further co-digestion studies were performed in an anaerobic up-flow bioreactor using sugar wastewater as a co-substrate. A high biogas production yield of 114 mL g −1 VS added was obtained with 75% of methane. The co-digestion proposed in this work allowed the recovery of natural methane, providing a promising alternative to conventional anaerobic microbial fermentation using Tunisian green macroalgae. Finally, in order to identify the microbial diversity present in the reactor during anaerobic digestion of Ulva rigida , the prokaryotic diversity was investigated in this bioreactor by the denaturing gradient gel electrophoresis (DGGE) method targeting the 16S rRNA gene. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  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:
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        Value: 10.1016/j.wasman.2016.11.042
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 171
    Subjects:
      – SubjectFull: Anaerobic digestion
        Type: general
      – SubjectFull: Microalgae
        Type: general
      – SubjectFull: Ulva
        Type: general
      – SubjectFull: Sugar industry
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      – SubjectFull: Wastewater treatment
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      – SubjectFull: Biogas production
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      – SubjectFull: Farm manure in methane production
        Type: general
    Titles:
      – TitleFull: Anaerobic co-digestion of Tunisian green macroalgae Ulva rigida with sugar industry wastewater for biogas and methane production enhancement.
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            NameFull: Karray, Raida
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            NameFull: Karray, Fatma
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            NameFull: Mhiri, Najla
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              Text: Mar2017
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