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Mar. Drugs 2015, 13(9), 5947-5975; doi:10.3390/md13095947

Anaerobic Digestion of Laminaria japonica Waste from Industrial Production Residues in Laboratory- and Pilot-Scale

1
Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, Bremen 28759, Germany
2
Phytolutions GmbH, Campus Ring 1, Bremen 28759, Germany
3
Department of Physics and Earth Sciences, Jacobs University Bremen, Campus Ring 1, Bremen 28759, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Takao Ojima
Received: 29 June 2015 / Revised: 21 August 2015 / Accepted: 28 August 2015 / Published: 18 September 2015
(This article belongs to the Special Issue Green Chemistry Approach to Marine Products)
View Full-Text   |   Download PDF [2108 KB, uploaded 18 September 2015]   |  

Abstract

The cultivation of macroalgae to supply the biofuel, pharmaceutical or food industries generates a considerable amount of organic residue, which represents a potential substrate for biomethanation. Its use optimizes the total resource exploitation by the simultaneous disposal of waste biomaterials. In this study, we explored the biochemical methane potential (BMP) and biomethane recovery of industrial Laminaria japonica waste (LJW) in batch, continuous laboratory and pilot-scale trials. Thermo-acidic pretreatment with industry-grade HCl or industrial flue gas condensate (FGC), as well as a co-digestion approach with maize silage (MS) did not improve the biomethane recovery. BMPs between 172 mL and 214 mL g−1 volatile solids (VS) were recorded. We proved the feasibility of long-term continuous anaerobic digestion with LJW as sole feedstock showing a steady biomethane production rate of 173 mL g−1 VS. The quality of fermentation residue was sufficient to serve as biofertilizer, with enriched amounts of potassium, sulfur and iron. We further demonstrated the upscaling feasibility of the process in a pilot-scale system where a CH4 recovery of 189 L kg−1 VS was achieved and a biogas composition of 55% CH4 and 38% CO2 was recorded. View Full-Text
Keywords: macroalgae; waste management; biogas; Laminaria japonica; industrial residuals; biomethane; flue gas condensate; maize co-digestion; thermo-acidic pretreatment macroalgae; waste management; biogas; Laminaria japonica; industrial residuals; biomethane; flue gas condensate; maize co-digestion; thermo-acidic pretreatment
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Barbot, Y.N.; Thomsen, C.; Thomsen, L.; Benz, R. Anaerobic Digestion of Laminaria japonica Waste from Industrial Production Residues in Laboratory- and Pilot-Scale. Mar. Drugs 2015, 13, 5947-5975.

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