title: Evaluation of ultrasonic, acid, thermo-alkaline and enzymatic pre-treatments on anaerobic digestion of Ulva rigida for biogas production.
abstract: Pre-treatment of macroalgae has received considerable research globally due to its influence on the technical, economic and environmental sustainability of algae biogas production. Some of the most promising pre-treatment methods require the application of chemicals, enzymatic, and mechanical. This study focused on these pre-treatments of Ulva rigida for biogas production. The evaluation of different pre-treatment in terms of reducing sugar yields demonstrates that 3.62, 2.88, 2.53 and 7.3g/L of reducing sugar was obtained in acid catalysis, thermoalkaline, ultrasonication and enzymatic pre-treatment, respectively. However in crude macroalgae only 0.6g/L of reducing sugar was given. After anaerobic digestion, the enzymatic hydrolysis was demonstrated the best biogas yield than other pre-treatment which reached 626.5mL/gCODint with 62.65% of biodegradability. The best demonstrated method which uses crude broth of Aspergillus niger showed an effective and environmentally friendly strategy for enhancing the biogas production yields after the anaerobic digestion.
authors: Laboratoire de bio-procédés environnementaux, Centre de Biotechnologie de Sfax, B.P. "1177", 3018 Sfax, Tunisia.
authors: Raida
authors: R
authors: Karray
authors: Laboratoire de bio-procédés environnementaux, Centre de Biotechnologie de Sfax, B.P. "1177", 3018 Sfax, Tunisia. Electronic address: manel.hamza@yahoo.fr.
authors: Manel
authors: M
authors: Hamza
authors: Laboratoire de bio-procédés environnementaux, Centre de Biotechnologie de Sfax, B.P. "1177", 3018 Sfax, Tunisia.
authors: Sami
authors: S
authors: Sayadi
mesh_terms: D000143:Acids / Q000737:chemistry; D000468:Alkalies / Q000737:chemistry; D000693:Anaerobiosis; D002384:Catalysis; D005947:Glucose / Q000737:chemistry* / Q000378:metabolism* / Q000528:radiation effects; D006358:Hot Temperature; D006867:Hydrolases / Q000737:chemistry*; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis* / Q000302:isolation & purification; D010084:Oxidation-Reduction; D012972:Sodium Hydroxide / Q000737:chemistry; D013010:Sonication; D013464:Sulfuric Acids / Q000737:chemistry; D000069453:Ultrasonic Waves; D044445:Ulva / Q000378:metabolism* / Q000528:radiation effects
chemical_list: D000143:Acids; D000468:Alkalies; D013464:Sulfuric Acids; D012972:Sodium Hydroxide; D006867:Hydrolases; D005947:Glucose; C033158:sulfuric acid; D008697:Methane
keywords: Acid-catalyst; Biogas; Fungal enzyme; Ultrasonication; Ulva rigida