Biogas production generated through continuous digestion of natural and cultivated seaweeds with dairy slurry. (November 2016)

• Record Type: Journal Article
• Authors: Tabassum, Muhammad Rizwan; Wall, David M.; Murphy, Jerry D.
• Is Part Of: Bioresource technology. Volume 219(2016)
• Page Start: 228
• Page End: 238
• Publication Date: 2016-11
• Subjects: L. digitata -- S. latissima -- Continuous digestion -- Biomethane; 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.2016.07.127
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Digestion of farmed and wild seaweeds were investigated at increasing loading rates. Long term digestion yields surpassed the batch biomethane potential yields. No correlation between the level of chloride and specific methane yield was found. Chloride concentrations of 14 g L −1 were achieved in stable digestion. L. digitata: dairy slurry mix at 66:33 (Volatile Solids) was stable at 5 gVS m − 3 d − 1 . Abstract: The technical feasibility of long term anaerobic mono-digestion of two brown seaweeds, and co-digestion of both seaweeds with dairy slurry was investigated whilst increasing the organic loading rate (OLR). One seaweed was natural ( L. digitata ); the second seaweed ( S. Latissima ) was cultivated. Higher proportions of L. digitata in co-digestion (66.6%) allowed the digester to operate more efficiently (OLR of 5 kg VS m −3 d −1 achieving a specific methane yield (SMY) of 232 L CH4 kg −1 VS) as compared to lower proportions (33.3%). Co-digestion of 66.6% cultivated S. latissima, with dairy slurry allowed a higher SMY of 252 L CH4 kg −1 VS but at a lower OLR of 4 kg VS m −3 d −1 . Optimum conditions for mono-digestion of both seaweeds were effected at 4 kg VS m −3 d −1 . Chloride concentrations increased to high levels in the digestion of both seaweeds but were not detrimental to operation.