Biogas Production from Microalgal Biomass Produced in the Tertiary Treatment of Urban Wastewater: Assessment of Seasonal Variations

The valorization of microalgal biomass produced during wastewater treatment has the potential to mitigate treatment costs. As contaminated biomass (e.g., with pharmaceuticals, toxic metals, etc.) is often generated, biogas production is considered an effective valorization option. The biomass was ob...

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Published inEnergies (Basel) Vol. 15; no. 15; p. 5713
Main Authors Barros, Raúl, Raposo, Sara, Morais, Etiele G., Rodrigues, Brígida, Afonso, Valdemira, Gonçalves, Pedro, Marques, José, Cerqueira, Paulo Ricardo, Varela, João, Teixeira, Margarida Ribau, Barreira, Luísa
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2022
Subjects
Algae
Alternative energy sources
Aquatic microorganisms
Biodegradability
Biodegradation
Biodiesel fuels
Biofuels
Biogas
Biomass
biomethane
Carbohydrates
Chemical oxygen demand
Consortia
Energy consumption
energy potential
Folding
Gas chromatography
Gases
Lipids
Metabolism
Metals
Methane
microalgal composition
Nitrogen
Organic matter
Phosphorus
Photobioreactors
Production costs
Proteins
Seasonal variations
Tertiary treatment
Tertiary wastewater treatment
thermo-acidic hydrolysis
Volatile solids
Wastewater treatment
Water treatment
Lisbon Portugal
Portugal
Germany
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Abstract The valorization of microalgal biomass produced during wastewater treatment has the potential to mitigate treatment costs. As contaminated biomass (e.g., with pharmaceuticals, toxic metals, etc.) is often generated, biogas production is considered an effective valorization option. The biomass was obtained from a pilot facility of photobioreactors for tertiary wastewater treatment. The pilots were run for one year with naturally formed microalgal consortia. The biogas was generated in 70 mL crimp-top vials at 35 °C, quantified with a manometer and the methane yield measured by gas chromatography. A maximum biogas production of 311 mL/g volatile solids (VS) with a methane yield of 252 mL/g VS was obtained with the spring samples. These rather low values were not improved using previous thermo-acidic hydrolysis, suggesting that the low intrinsic biodegradable organic matter content of the consortia might be the cause for low yield. Considering the total volume of wastewater treated by this plant and the average amount of methane produced in this study, the substitution of the current tertiary treatment with the one here proposed would reduce the energy consumption of the plant by 20% and create an energy surplus of 2.8%. The implementation of this system would therefore contribute towards meeting the ambitious decarbonization targets established by the EU.
AbstractList The valorization of microalgal biomass produced during wastewater treatment has the potential to mitigate treatment costs. As contaminated biomass (e.g., with pharmaceuticals, toxic metals, etc.) is often generated, biogas production is considered an effective valorization option. The biomass was obtained from a pilot facility of photobioreactors for tertiary wastewater treatment. The pilots were run for one year with naturally formed microalgal consortia. The biogas was generated in 70 mL crimp-top vials at 35 °C, quantified with a manometer and the methane yield measured by gas chromatography. A maximum biogas production of 311 mL/g volatile solids (VS) with a methane yield of 252 mL/g VS was obtained with the spring samples. These rather low values were not improved using previous thermo-acidic hydrolysis, suggesting that the low intrinsic biodegradable organic matter content of the consortia might be the cause for low yield. Considering the total volume of wastewater treated by this plant and the average amount of methane produced in this study, the substitution of the current tertiary treatment with the one here proposed would reduce the energy consumption of the plant by 20% and create an energy surplus of 2.8%. The implementation of this system would therefore contribute towards meeting the ambitious decarbonization targets established by the EU.
Author Teixeira, Margarida Ribau
Barreira, Luísa
Barros, Raúl
Varela, João
Morais, Etiele G.
Rodrigues, Brígida
Raposo, Sara
Afonso, Valdemira
Gonçalves, Pedro
Marques, José
Cerqueira, Paulo Ricardo
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  surname: Barreira
  fullname: Barreira, Luísa
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Snippet The valorization of microalgal biomass produced during wastewater treatment has the potential to mitigate treatment costs. As contaminated biomass (e.g., with...
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SubjectTerms Algae
Alternative energy sources
Aquatic microorganisms
Biodegradability
Biodegradation
Biodiesel fuels
Biofuels
Biogas
Biomass
biomethane
Carbohydrates
Chemical oxygen demand
Consortia
Energy consumption
energy potential
Folding
Gas chromatography
Gases
Lipids
Metabolism
Metals
Methane
microalgal composition
Nitrogen
Organic matter
Phosphorus
Photobioreactors
Production costs
Proteins
Seasonal variations
Tertiary treatment
Tertiary wastewater treatment
thermo-acidic hydrolysis
Volatile solids
Wastewater treatment
Water treatment
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Title Biogas Production from Microalgal Biomass Produced in the Tertiary Treatment of Urban Wastewater: Assessment of Seasonal Variations
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https://doaj.org/article/b8ebda840ea44fa29beedcdbaafe669a
Volume 15
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