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Comparative life cycle assessment of microalgae-mediated CO2 capture in open raceway pond and airlift photobioreactor system
- Source :
- Clean Technologies and Environmental Policy. 20:2357-2364
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- A comparative life cycle assessment of CO2 capture potential of microalgae, Scenedesmus dimorphus, during autotrophic cultivation in closed airlift photobioreactor and open raceway pond under Indian conditions has been carried out. The LCA inventory inputs for the both the systems were entirely based on primary experimental data obtained by algal cultivation in 1000-L pilot-scale raceway pond and 5-L airlift photobioreactor, respectively. The primary energy demand, environmental impacts and Net CO2 capture efficiency of both the systems were evaluated. The results indicated that the primary energy demand and GWP of airlift photobioreactor were 3.7-fold higher than raceway pond. The NERCO2 (defined as net emission ratio of CO2 and estimated as ratio of CO2 sequestered/CO2 emitted) of raceway pond was fourfold higher as compared to airlift photobioreactor; however, both the cultivation systems were observed to be net negative in terms of CO2 sequestration. However, the process can become net CO2 positive, with up to fourfold and 7.5-fold enhancement in biomass productivities (wrt base value) for raceway pond and airlift photobioreactor, respectively. Further, LCA predictions indicated that utilization of energy-efficient motors with lower specific energy consumptions for microalgae cultivation would facilitate algal cultivation systems to achieve net CO2-positive sequestration.
- Subjects :
- Economics and Econometrics
Environmental Engineering
biology
020209 energy
Scenedesmus dimorphus
Environmental engineering
Airlift
Biomass
Photobioreactor
02 engineering and technology
010501 environmental sciences
Management, Monitoring, Policy and Law
Carbon sequestration
biology.organism_classification
01 natural sciences
General Business, Management and Accounting
Comparative life cycle assessment
0202 electrical engineering, electronic engineering, information engineering
Environmental Chemistry
Environmental science
Autotroph
0105 earth and related environmental sciences
Raceway pond
Subjects
Details
- ISSN :
- 16189558 and 1618954X
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Clean Technologies and Environmental Policy
- Accession number :
- edsair.doi...........2968dfb735f84ce8a39cbad9420824b8