from environmental such as the Department for Environment Food and Rural
Affairs (DEFRA) (DECC 2010; Laratte et al. 2014).
E ¼
X
i
Mi  Pi
ð3Þ
Impact factors are reported at different times and are commonly estimated at 20,
100, or 500 years. In this way, long-lasting compounds such as carbon dioxide
(CO 2 ) tend to remain and concentrate for a longer period in the atmosphere (around
100 years). However, compounds with smaller residence ranges, such as methane,
assume heating profiles capable of emitting heating potentials 60 times larger and
23 times more potent when compared to CO 2 (Yvon-Durocher et al. 2014). In this
sense, the representation of the pollutant gas and the estimated residence time
should be considered according to the profile of the system to be analyzed.
Moreover, among the three-time horizons cited above, the 100-year level is most
commonly used as a standard time horizon for expressing GWPs (Guo and Murphy
2012).
2.4 Interpretation
Interpretation is the phase of the LCA where the findings of the inventory analysis
and the impact assessment are combined or, in the case of life cycle inventory
studies, only the results of the inventory analysis consistent with the defined
objective and scope to reach conclusions and recommendations. The results of this
interpretation may take the form of conclusions and recommendations to decision
makers as long as they are consistent with the purpose and scope of the study (ISO
14043 2000).
In addition, this phase may involve the interactive process of reviewing the
scope, as well as making assumptions made during the study. In this way, since
the verification of the quality and nature of the data collection occurs through the
estimation of the scenario, the parameters are modified in a systematic way always
considering the initial objective defined (ILDC 2010).
3 Data Set Reported in the Literature
Microalgae are indicated as a potential alternative to traditional fuel resources
because of their ability to be used for the generation biofuels. The potential fuels
include biogas, biohydrogen, bioethanol, and biodiesel (Brennan and Owende
146
M. C. Deprá et al.
Affairs (DEFRA) (DECC 2010; Laratte et al. 2014).
E ¼
X
i
Mi  Pi
ð3Þ
Impact factors are reported at different times and are commonly estimated at 20,
100, or 500 years. In this way, long-lasting compounds such as carbon dioxide
(CO 2 ) tend to remain and concentrate for a longer period in the atmosphere (around
100 years). However, compounds with smaller residence ranges, such as methane,
assume heating profiles capable of emitting heating potentials 60 times larger and
23 times more potent when compared to CO 2 (Yvon-Durocher et al. 2014). In this
sense, the representation of the pollutant gas and the estimated residence time
should be considered according to the profile of the system to be analyzed.
Moreover, among the three-time horizons cited above, the 100-year level is most
commonly used as a standard time horizon for expressing GWPs (Guo and Murphy
2012).
2.4 Interpretation
Interpretation is the phase of the LCA where the findings of the inventory analysis
and the impact assessment are combined or, in the case of life cycle inventory
studies, only the results of the inventory analysis consistent with the defined
objective and scope to reach conclusions and recommendations. The results of this
interpretation may take the form of conclusions and recommendations to decision
makers as long as they are consistent with the purpose and scope of the study (ISO
14043 2000).
In addition, this phase may involve the interactive process of reviewing the
scope, as well as making assumptions made during the study. In this way, since
the verification of the quality and nature of the data collection occurs through the
estimation of the scenario, the parameters are modified in a systematic way always
considering the initial objective defined (ILDC 2010).
3 Data Set Reported in the Literature
Microalgae are indicated as a potential alternative to traditional fuel resources
because of their ability to be used for the generation biofuels. The potential fuels
include biogas, biohydrogen, bioethanol, and biodiesel (Brennan and Owende
146
M. C. Deprá et al.