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Effect of thermochemical pretreatment on the solubilization and anaerobic biodegradability of the red macroalga Palmaria palmata

Paper ID Volume ID Publish Year Pages File Format Full-Text
3292 162 2013 6 PDF Available
Title
Effect of thermochemical pretreatment on the solubilization and anaerobic biodegradability of the red macroalga Palmaria palmata
Abstract

•With a methane potential of 308 ± 9 mL gVS−1, Palmaria palmata revealed to be attractive for biogas production.•Palmate methane potential decreased after high temperature treatment (180–200 °C).•Alkali pretreatments at room and low temperature (70–85 °C) enhanced the methane production of 11–13%.

The rapid development of anaerobic digestion brought with it the problem of biomass resources and supply. Marine biomass is emerging as an advantageous substrate. Such macroalgae as Palmaria palmata are promising substrates for anaerobic digestion as they possess a high methane potential (308 ± 9 mL gVS−1). The aim of this paper was to study the efficiency of the anaerobic digestion of P. palmata after a range of thermal and chemical pretreatment. The anaerobic digestion of raw and pretreated macroalgae was carried out in batch mesophilic biomethane potential tests (BMP). Thermal (between 20 and 200 °C) and thermo-chemical (addition of NaOH and HCl) pretreatment were performed on P. palmata. Thermal pretreatments at 20, 70, 85 and 120 °C and acid or soda pretreatments at 160 °C had no significant effect on P. palmata's methane potential. After high temperature pretreatment (180–200 °C), the BMP decreased with the temperature which can be explained by the formation of refractory compounds in the liquid fraction. In contrast, the addition of 0.04 gNaOH gTS−1 at 20 °C led to a release of proteins and induced an increase in the BMP from 308 ± 9 mL gVS−1 (untreated) to 365 ± 9 mL gVS−1. Thus, P. palmata can be used advantageously as a substrate for anaerobic digestion and its methane production enhanced by the addition of NaOH.

Keywords
BMP, biochemical methane potential; COD, chemical oxygen demand; N-NH4, mineral nitrogen; N-org, organic nitrogen; TKN, total Kjeldahl nitrogen; TS, total solids; TOC, total organic carbon; VFA, volatile fatty acids; VS, volatile solidsAnaerobic digestion
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Effect of thermochemical pretreatment on the solubilization and anaerobic biodegradability of the red macroalga Palmaria palmata
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 79, 15 October 2013, Pages 253–258
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us