Life cycle assessment of biodiesel production from algal bio-crude oils extracted under subcritical water conditions

Sundaravadivelnathan Ponnusamy, Harvind Kumar Reddy, Tapaswy Muppaneni, Cara Meghan Downes, Shuguang Deng

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

A life cycle assessment study is performed for the energy requirements and greenhouse gas emissions in an algal biodiesel production system. Subcritical water (SCW) extraction was applied for extracting bio-crude oil from algae, and conventional transesterification method was used for converting the algal oil to biodiesel. 58MJ of energy is required to produce 1kg of biodiesel without any co-products management, of which 36% was spent on cultivation and 56% on lipid extraction. SCW extraction with thermal energy recovery reduces the energy consumption by 3-5 folds when compared to the traditional solvent extraction. It is estimated that 1kg of algal biodiesel fixes about 0.6kg of CO2. An optimized case considering the energy credits from co-products could further reduce the total energy demand. The energy demand for producing 1kg of biodiesel in the optimized case is 28.23MJ.

Original languageEnglish (US)
Pages (from-to)454-461
Number of pages8
JournalBioresource Technology
Volume170
DOIs
StatePublished - 2014
Externally publishedYes

Fingerprint

Biofuels
Petroleum
Biodiesel
Life Cycle Stages
crude oil
Life cycle
life cycle
Crude oil
Water
energy
production system
water
greenhouse gas
lipid
alga
fold
Transesterification
Solvent extraction
Algae
Thermal energy

Keywords

  • Biodiesel
  • Greenhouse gas emissions
  • LCA
  • Life cycle assessment
  • Subcritical water extraction

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal
  • Medicine(all)

Cite this

Life cycle assessment of biodiesel production from algal bio-crude oils extracted under subcritical water conditions. / Ponnusamy, Sundaravadivelnathan; Reddy, Harvind Kumar; Muppaneni, Tapaswy; Downes, Cara Meghan; Deng, Shuguang.

In: Bioresource Technology, Vol. 170, 2014, p. 454-461.

Research output: Contribution to journalArticle

Ponnusamy, Sundaravadivelnathan ; Reddy, Harvind Kumar ; Muppaneni, Tapaswy ; Downes, Cara Meghan ; Deng, Shuguang. / Life cycle assessment of biodiesel production from algal bio-crude oils extracted under subcritical water conditions. In: Bioresource Technology. 2014 ; Vol. 170. pp. 454-461.
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