Journal
BIORESOURCE TECHNOLOGY
Volume 162, Issue -, Pages 323-330Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.03.155
Keywords
Algae; Gracilaria sp.; Glycerol; Pre-treatment; Sewage sludge
Funding
- Portuguese Science Foundation (FCT)
- European Social Fund (ESF, POPH-QREN) [SFRH/BDP/48962/2008]
- FEDER
- FCT Strategic Project [PEst- OE/EQB/LA0023/2013]
- FCT [RECI/BBB-EBI/0179/2012]
- BioEnv Biotechnology and Bioengineering for a sustainable world - Programa Operacional Regional do Norte (ON. 2 - O Novo Norte) [NORTE-07-0124-FEDER-000048]
- QREN
- FCOMP-01-0124-FEDER-027914 [PTDC/AAG-TEC/3048/2012]
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A design of experiments was applied to evaluate different strategies to enhance the methane yield of macroalgae Gracilaria vermiculophylla. Biochemical Methane Potential (BMP) of G. vermiculophylla after physical pre-treatment (washing and maceration) reached 481 +/- 9 L CH4 kg (1) VS, corresponding to a methane yield of 79 +/- 2%. No significant effects were achieved in the BMP after thermochemical pretreatment, although the seaweeds solubilisation increased up to 44%. Co-digestion with glycerol or sewage sludge has proved to be effective for increasing the methane production. Addition of 2% glycerol ( w:w) increased the BMP by 18%, achieving almost complete methanation of the substrate (96 +/- 3%). Co-digestion of seaweed and secondary sludge (15:85%, TS/TS) increased the BMP by 25% (605 +/- 4 L CH4 kg(-1) VS) compared to the seaweed individual digestion. (C) 2014 Elsevier Ltd. All rights reserved.
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