期刊
WASTE AND BIOMASS VALORIZATION
卷 9, 期 11, 页码 2221-2235出版社
SPRINGER
DOI: 10.1007/s12649-017-9996-8
关键词
Pyrolysis; Biomass; Algae; Nannochloropsis gaditana
资金
- Ministry of Science and Higher Education under the Iuventus Plus program in 2015-2016 [IP2014 041073]
- NCBiR [4, SP/E/4/65786/10]
In this study, the pyrolysis behaviours of marine microalgae biomass, Nannochloropsis gaditana, were investigated at three different temperatures (400, 500, 600 degrees C). Experiments were conducted in the presence of N-2 with a flow rate of 50 cm(3)/h using a 1-kg fixed-bed reactor. The effects of pyrolysis conditions such as temperature on product yields were studied. The char, bio-oil, and gaseous samples obtained were analysed for elemental trace metals using inductively coupled plasma atomic emission spectroscopy (ICP-OES) and gas chromatography with mass detection (GC-MS). Raw Nannochloropsis gaditana samples were also analysed by pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). Mass and energy balances were calculated. The results indicate that the bio-oil from the pyrolysis of Nannochloropsis gaditana under 600 degrees C had the highest heating value (12.6 MJ/kg) and was obtained with the highest efficiency (38-40%). Alkanes and alkenes, such as tetradecane, pentadecane, heptadecene, and octadecene, were identified in the liquid products, and the highest contents of alkanes and alkenes were determined in the bio-oil obtained under 500 degrees C. In these pyrolysis conditions, gaseous products exhibited the highest concentrations of methane (greater than 50% in the maximum range). These properties of the bio-oil and its gaseous products demonstrated that Nannochloropsis gaditana can be used as a renewable energy resource and chemical feedstock. The biochar from all processes contained almost 70% ash and, in this particular case, can be used as, for example, a fertilizer because it does not contain any heavy metals.
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