Biogas from marine macoalgal waste

  • Biogas belongs to the biomass-based renewable energy family and biogas plants are largely operated on terrestrial energy crops. Their growth requires fertile farmland, fresh water and fertilizer and faces direct competition with food crop production. It is hoped that third generation biofuels derived from marine biomass will relieve the pressures of the present situation. At the same time, extensive (macro)algal blooms and hypertrophication are common events reported in coastal regions all over the world, causing harm to the marine ecosystem and impairing local tourism. This biomass presents a potential substrate candidate for use in biogas plants, offering the benefits of both the disposal of algae waste and the provision of alternative biogas substrate. In this study the biomethanation potentials of three types of macroalgae were investigated which represent disposable waste material and material involved in eutrophication events. The degradation studies were carried out in batch and continuous systems. Mild thermo-acidic hydrolysis pretreatment was applied to the biomaterial to increase its degradability and boost the biomethane yield. Acid hydrolysis was successfully triggered at 80°C in technical acid media (HCl) as well as in flue gas condensate, a liquid acid waste accumulating in power plants. Co-digestion of macroalgae with maize silage and comparison of mesophilic to thermophilic anaerobic digestion did not lead to any significant benefits. Continuous anaerobic digestion of the respective single macroalgae were successfully conducted throughout several hydraulic residences in mesophilic and thermophilic mode. The trials showed biochemical stability and the possibility of steady CH4 production. The fermentation residue could serve as biofertilizer but exhibited contrasting abilities regarding macronutrient and trace element concentrations. The pollution of macroalgae digestate with heavy metals was acceptable for all tested biomass. Continuous pilot-scale trials with native Lj demonstrated the feasibility of upscaling the overall process with convergence to industrial process conditions.

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Publishing Institution:IRC-Library, Information Resource Center der Jacobs University Bremen
Granting Institution:Jacobs Univ.
Author:Yann Nicolas Barbot
Referee:Roland Benz, Laurenz Thomsen, Florian Kuhnen
Advisor:Roland Benz
Persistent Identifier (URN):urn:nbn:de:gbv:579-opus-1002476
Document Type:PhD Thesis
Date of Successful Oral Defense:2014/11/14
Year of Completion:2014
Date of First Publication:2014/12/04
PhD Degree:Biochemical Engineering
School:SES School of Engineering and Science
Library of Congress Classification:T Technology / TP Chemical technology / TP315-360 Fuel / TP339 Biomass
Call No:Thesis 2014/30

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