Evaluation of ultrasonic, acid, thermo-alkaline and enzymatic pre-treatments on anaerobic digestion of Ulva rigida for biogas production. (July 2015)

• Record Type: Journal Article
• Authors: Karray, Raida; Hamza, Manel; Sayadi, Sami
• Is Part Of: Bioresource technology. Volume 187(2015)
• Page Start: 205
• Page End: 213
• Publication Date: 2015-07
• Subjects: Fungal enzyme -- Ulva rigida -- Biogas -- Ultrasonication -- Acid-catalyst; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2015.03.108
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Green macroalga Ulva rigida was used as feedstock for biogas production. Four pre-treatment of U. rigida were used to enhance biogas production. After enzymatic hydrolysis of U. rigida reducing sugar reached 7.3 g/L. The best biogas yield 626.5 mL/g CODint was obtained after enzymatic hydrolysis. 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 7.3 g/L of reducing sugar was obtained in acid catalysis, thermoalkaline, ultrasonication and enzymatic pre-treatment, respectively. However in crude macroalgae only 0.6 g/L of reducing sugar was given. After anaerobic digestion, the enzymatic hydrolysis was demonstrated the best biogas yield than other pre-treatment which reached 626.5 mL/g CODint 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.