Comparison of energy recovery after anaerobic digestion of three Marchica lagoon algae ( Caulerpa prolifera , Colpomenia sinuosa , Gracilaria bursa-pastoris )
| Autor: | Ouahid El Asri, Mohamed Ramdani, Lahbib Latrach, Benyounes Haloui, Mohamed Elamin Afilal |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
biology
Renewable Energy Sustainability and the Environment 020209 energy 02 engineering and technology Caulerpa prolifera biology.organism_classification Industrial and Manufacturing Engineering Anaerobic digestion Biogas Algae Botany 0202 electrical engineering electronic engineering information engineering General Materials Science Anaerobic bacteria Colpomenia sinuosa Eutrophication Gracilaria Waste Management and Disposal |
| Zdroj: | Sustainable Materials and Technologies. 11:47-52 |
| ISSN: | 2214-9937 |
| DOI: | 10.1016/j.susmat.2016.12.002 |
| Popis: | The Marchica lagoon, which currently suffers from eutrophication caused by algae proliferation, is one of the largest lagoons in the Mediterranean. In this work, we valorised the three important algae ( Caulerpa prolifera , Gracilaria bursa-pastoris , and Colpomenia sinuosa ) that are responsible for pollution of the lagoon, by determining their biogas production and green energy capacities and studying their effects on anaerobic bacteria. The red alga Gracilaria bursa-pastoris produced the most biogas with 86.35 ml/g VS, which is equivalent to 514.99 kWh/t VS of green energy, whereas the brown alga Colpomenia sinuosa ranked second with 74.68 ml/g VS of biogas product, the equivalent to 445.39 kWh/tVS. Thus, these two algae were considered excellent substrates for anaerobic digestion. The green alga Caulerpa prolifera produced the least biogas with only 24.53 ml/g VS and green energy of 146.29 kWh/t VS. These results correlated with the anaerobic bacterial proliferation of the inoculum, where Gracilaria bursa-pastoris led to a large proliferation of anaerobic bacteria, from 0.19 × 10 6 CFU/g to 7 × 10 6 CFU/g, followed by the brown alga and the green alga. Therefore, we consider these three Marchica lagoon algae ( Caulerpa prolifera , Gracilaria bursa-pastoris , and Colpomenia sinuosa ) as an exploitable energy reservoir. Finally, we propose that a plant, comprising anaerobic digestion of the three algae, be installed to produce energy and a lagoon aerator to dissolve the atmospheric oxygen inside the lagoon. This will halt eutrophication of the Marchica lagoon. |
| Databáze: | OpenAIRE |
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