The University of Southampton
University of Southampton Institutional Repository

Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion

Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion
Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion
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.
micro-algae, anaerobic digestion, biochemical methane potential, biodegradability kinetics, biomass yield, growth rate
0960-1481
744-753
Roberts, Keiron P.
da377993-082e-4693-8814-8983ab028258
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Roberts, Keiron P.
da377993-082e-4693-8814-8983ab028258
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f

Roberts, Keiron P., Heaven, Sonia and Banks, Charles J. (2016) Comparative testing of energy yields from micro-algal biomass cultures processed via anaerobic digestion. Renewable Energy, 87, part 1, 744-753. (doi:10.1016/j.renene.2015.11.009).

Record type: Article

Abstract

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.

Text
__soton.ac.uk_ude_PersonalFiles_Users_sh7_mydocuments_SHnow_Res_Papers_Roberts_Algal BMP_Published_Roberts et al 2016 - scholar text.pdf - Accepted Manuscript
Download (689kB)

More information

Accepted/In Press date: 2 November 2015
e-pub ahead of print date: 14 November 2015
Published date: March 2016
Keywords: micro-algae, anaerobic digestion, biochemical methane potential, biodegradability kinetics, biomass yield, growth rate
Organisations: Water & Environmental Engineering Group

Identifiers

Local EPrints ID: 384738
URI: https://eprints.soton.ac.uk/id/eprint/384738
ISSN: 0960-1481
PURE UUID: df4eb5aa-a821-4b34-a0ea-d8ffd26b2d2f

Catalogue record

Date deposited: 08 Jan 2016 15:27
Last modified: 02 Dec 2019 20:28

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×