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      Enhancing methane production of Chlorella vulgaris via thermochemical pretreatments.

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          Abstract

          To enhance the anaerobic digestion of Chlorella vulgaris, thermochemical pretreatments were conducted. All pretreatments markedly improved solubilisation of carbohydrates. Thermal treatments and thermal treatments combined with alkali resulted in 5-fold increase of soluble carbohydrates while thermal treatment with acid addition enhanced by 7-fold. On the other hand, proteins were only solubilized with thermo-alkaline conditions applied. Likewise, all the pretreatments tested improved methane production. Highest anaerobic digestion was accomplished by thermal treatment at 120°C for 40 min without any chemical addition. As a matter of fact, hydrolysis constant rate was doubled under this condition. According to the energetic analysis, energy input was higher than the extra energy gain at the solid concentration employed. Nevertheless, higher biomass organic load pretreatment may be an option to achieve positive energetic balances.

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          Author and article information

          Journal
          Bioresour. Technol.
          Bioresource technology
          Elsevier BV
          1873-2976
          0960-8524
          Dec 2013
          : 149
          Affiliations
          [1 ] IMDEA Energy, Avda. Ramón de la Sagra 3, 28935 Móstoles, Madrid, Spain.
          Article
          S0960-8524(13)01387-4
          10.1016/j.biortech.2013.08.136
          24096280
          930be3c5-8d9c-4ed2-a071-68db463eeeee
          History

          Pretreatment,Microalgae,Methane,Chlorella vulgaris,Anaerobic digestion

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