RENEWABLE ENERGY | 卷:87 |
Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion | |
Article | |
Roberts, Keiron P.1  Heaven, Sonia1  Banks, Charles J.1  | |
[1] Univ Southampton, Fac Engn & Environm, Southampton SO17 1BJ, Hants, England | |
关键词: Micro-algae; Anaerobic digestion; Biochemical methane potential; Biodegradability kinetics; Biomass yield; Growth rate; | |
DOI : 10.1016/j.renene.2015.11.009 | |
来源: Elsevier | |
【 摘 要 】
Although digestion of micro-algal biomass was first suggested in the 1950s, there is still only limited information available for assessment of its potential. The research examined six laboratory-grown marine and freshwater micro-algae and two samples from large-scale cultivation systems. Biomass composition was characterised to allow prediction of potentially available energy using the Buswell equation, with calorific values as a benchmark for energy recovery. Biochemical methane potential tests were analysed using a pseudo-parallel first order model to estimate kinetic coefficients and proportions of readily-biodegradable carbon. Chemical composition was used to assess potential interferences from nitrogen and sulphur components. Volatile solids (VS) conversion to methane showed a broad range, from 0.161 to 0.435 L CH4 g(-1) VS; while conversion of calorific value ranged from 26.4 to 79.2%. Methane productivity of laboratory-grown species was estimated from growth rate, measured by changes in optical density in batch culture, and biomass yield based on an assumed harvested solids content. Volumetric productivity was 0.04-0.08 L CH4 L-1 culture day(-1), the highest from the marine species Thalassiosira pseudonana. Estimated methane productivity of the large-scale raceway was lower at 0.01 L CH4 L-1 day(-1). The approach used offers a means of screening for methane productivity per unit of cultivation under standard conditions. (C) 2015 Elsevier Ltd. All rights reserved.
【 授权许可】
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