The effects of limiting nighttime aeration on productivity and lipid accumulation in Scenedesmus dimorphous

Everett Eustance, Joshua T. Wray, Shahrzad Badvipour, Milton R. Sommerfeld

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

As algal research strives for economic viability of algal biomass as a resource for biofuels and bioproducts there are two key foci that need continued research: reducing energy consumption and utilizing ammonium as nitrogen source. One of the largest concerns in utilizing ammonium as a nitrogen source for algal cultivation is the volatility and toxicity associated with pH values greater than 8.0. In cultures aerated with increased CO<inf>2</inf> concentrations pH becomes problematic at night when the CO<inf>2</inf> supply is removed and the pH of the cultivation medium re-equilibrates with the atmosphere (typically) above a pH of 8.0. In photobioreactors, one of the ways to eliminate energy consumption is to minimize aeration and mixing at night, which also prevents the pH of the medium from increasing. However, by eliminating nighttime aeration cultures show a significant lag in lipid accumulation attributable to anoxic conditions. To minimize oxygen limitations, cultures were either periodically sparged or supplied with low aeration (less than 10% of daytime aeration) to minimize pH increase. The results showed similar productivities to highly aerated cultures with a decrease of more than 95% of nightly aeration requirements and concomitant energy consumption.

Original languageEnglish (US)
Pages (from-to)33-40
Number of pages8
JournalAlgal Research
Volume10
DOIs
StatePublished - Jul 1 2015

Fingerprint

Scenedesmus
aeration
energy use and consumption
lipids
biobased products
economic sustainability
nitrogen
biofuels
anaerobic conditions
toxicity
oxygen
biomass

Keywords

  • Aeration
  • Algae cultivation
  • Ammonium
  • Biodiesel
  • Scenedesmus

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

The effects of limiting nighttime aeration on productivity and lipid accumulation in Scenedesmus dimorphous. / Eustance, Everett; Wray, Joshua T.; Badvipour, Shahrzad; Sommerfeld, Milton R.

In: Algal Research, Vol. 10, 01.07.2015, p. 33-40.

Research output: Contribution to journalArticle

Eustance, Everett ; Wray, Joshua T. ; Badvipour, Shahrzad ; Sommerfeld, Milton R. / The effects of limiting nighttime aeration on productivity and lipid accumulation in Scenedesmus dimorphous. In: Algal Research. 2015 ; Vol. 10. pp. 33-40.
@article{12af374ced1044359dfbdb50cec9a868,
title = "The effects of limiting nighttime aeration on productivity and lipid accumulation in Scenedesmus dimorphous",
abstract = "As algal research strives for economic viability of algal biomass as a resource for biofuels and bioproducts there are two key foci that need continued research: reducing energy consumption and utilizing ammonium as nitrogen source. One of the largest concerns in utilizing ammonium as a nitrogen source for algal cultivation is the volatility and toxicity associated with pH values greater than 8.0. In cultures aerated with increased CO2 concentrations pH becomes problematic at night when the CO2 supply is removed and the pH of the cultivation medium re-equilibrates with the atmosphere (typically) above a pH of 8.0. In photobioreactors, one of the ways to eliminate energy consumption is to minimize aeration and mixing at night, which also prevents the pH of the medium from increasing. However, by eliminating nighttime aeration cultures show a significant lag in lipid accumulation attributable to anoxic conditions. To minimize oxygen limitations, cultures were either periodically sparged or supplied with low aeration (less than 10{\%} of daytime aeration) to minimize pH increase. The results showed similar productivities to highly aerated cultures with a decrease of more than 95{\%} of nightly aeration requirements and concomitant energy consumption.",
keywords = "Aeration, Algae cultivation, Ammonium, Biodiesel, Scenedesmus",
author = "Everett Eustance and Wray, {Joshua T.} and Shahrzad Badvipour and Sommerfeld, {Milton R.}",
year = "2015",
month = "7",
day = "1",
doi = "10.1016/j.algal.2015.04.002",
language = "English (US)",
volume = "10",
pages = "33--40",
journal = "Algal Research",
issn = "2211-9264",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - The effects of limiting nighttime aeration on productivity and lipid accumulation in Scenedesmus dimorphous

AU - Eustance, Everett

AU - Wray, Joshua T.

AU - Badvipour, Shahrzad

AU - Sommerfeld, Milton R.

PY - 2015/7/1

Y1 - 2015/7/1

N2 - As algal research strives for economic viability of algal biomass as a resource for biofuels and bioproducts there are two key foci that need continued research: reducing energy consumption and utilizing ammonium as nitrogen source. One of the largest concerns in utilizing ammonium as a nitrogen source for algal cultivation is the volatility and toxicity associated with pH values greater than 8.0. In cultures aerated with increased CO2 concentrations pH becomes problematic at night when the CO2 supply is removed and the pH of the cultivation medium re-equilibrates with the atmosphere (typically) above a pH of 8.0. In photobioreactors, one of the ways to eliminate energy consumption is to minimize aeration and mixing at night, which also prevents the pH of the medium from increasing. However, by eliminating nighttime aeration cultures show a significant lag in lipid accumulation attributable to anoxic conditions. To minimize oxygen limitations, cultures were either periodically sparged or supplied with low aeration (less than 10% of daytime aeration) to minimize pH increase. The results showed similar productivities to highly aerated cultures with a decrease of more than 95% of nightly aeration requirements and concomitant energy consumption.

AB - As algal research strives for economic viability of algal biomass as a resource for biofuels and bioproducts there are two key foci that need continued research: reducing energy consumption and utilizing ammonium as nitrogen source. One of the largest concerns in utilizing ammonium as a nitrogen source for algal cultivation is the volatility and toxicity associated with pH values greater than 8.0. In cultures aerated with increased CO2 concentrations pH becomes problematic at night when the CO2 supply is removed and the pH of the cultivation medium re-equilibrates with the atmosphere (typically) above a pH of 8.0. In photobioreactors, one of the ways to eliminate energy consumption is to minimize aeration and mixing at night, which also prevents the pH of the medium from increasing. However, by eliminating nighttime aeration cultures show a significant lag in lipid accumulation attributable to anoxic conditions. To minimize oxygen limitations, cultures were either periodically sparged or supplied with low aeration (less than 10% of daytime aeration) to minimize pH increase. The results showed similar productivities to highly aerated cultures with a decrease of more than 95% of nightly aeration requirements and concomitant energy consumption.

KW - Aeration

KW - Algae cultivation

KW - Ammonium

KW - Biodiesel

KW - Scenedesmus

UR - http://www.scopus.com/inward/record.url?scp=84937575081&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84937575081&partnerID=8YFLogxK

U2 - 10.1016/j.algal.2015.04.002

DO - 10.1016/j.algal.2015.04.002

M3 - Article

AN - SCOPUS:84937575081

VL - 10

SP - 33

EP - 40

JO - Algal Research

JF - Algal Research

SN - 2211-9264

ER -