scholarly journals Life Cycle Assessment of Free-Floating Bike Sharing on Greenhouse Gas Emissions: A Case Study in Nanjing, China

2021 ◽  
Vol 11 (23) ◽  
pp. 11307
Author(s):  
Ruxin Lai ◽  
Xinwei Ma ◽  
Fan Zhang ◽  
Yanjie Ji
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Online Survey ◽  
Environmental Benefits ◽  
Low Carbon ◽  
Environmental Benefit ◽  
Modal Shift ◽  
Trip Chain ◽  
Bike Sharing ◽  
Incentive Policies

The free-floating bike sharing (FFBS) system appears in the form of low-carbon transport mode. Life cycle assessment (LCA) is a method to analyze the environmental impact of FFBS but has rarely considered the trip chain if the intermodal transport modes were employed. This paper proposes a mathematical formalization of LCA in response to the trip chain. The environmental benefit of FFBS was analyzed by this method considering the production, use, operation, and disposal phases in Nanjing. An online survey was conducted to analyze the mechanism of modal shift influenced by FFBS. The results showed that most respondents only use FFBS in the trip, with savings of 63.726 g CO2-eq/p·km, mainly shifting from lower-emission modes (28.30% from bus, 14.86% from metro, and 33.97% from non-motorized modes), while the trip mode of connecting public transport with FFBS could better replace the motorized transport trip and generate better low-carbon benefits with savings of 300.718 g CO2-eq/p·km. One FFBS should be used for at least 227 days to generate positive environmental benefits based on the current number of FFBS and the assumption of the utilization of each bike, which is once a day on average. The research results can effectively support the environmental benefit analysis of FFBS, the subsequent planning based on the low-carbon concept, and the implementation of relevant incentive policies.

scholarly journals Life Cycle Assessment of Silicon-Based Tandem Solar Photovoltaics and their End-of-Life

2019 ◽  
Author(s):  
Marina Moneiro Lunardi ◽  
Juan Pablo Alvarez-Gaitan ◽  
Jose Bilbao ◽  
Richard Paul Corkish
Keyword(s):  
Thin Film ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
End Of Life ◽  
Silicon Wafer ◽  
Environmental Benefits ◽  
Low Carbon ◽  
Silicon Thin Film ◽  
Solar Photovoltaics ◽  
Mechanical Methods

The rapid global uptake of solar photovoltaics (PV) promises the hope of affordable low-carbon electricity. Most production of PV modules so far, and for the foreseeable future, has been based on silicon wafer cells and while there are further R&D outcomes still to be fully transferred to the silicon cell industry, the next major technology change is likely to be the addition of a thin-film top cell to form an efficient tandem device. The authors have applied life cycle assessment (LCA) to several of the current and potential mass manufactured solar cell technology choices, including different silicon wafer styles and silicon/thin-film tandems. We have demonstrated that the environmental benefits of some paths for efficiency improvements, particularly of the incorporation of atomic hydrogen into silicon wafers, more than compensate for the additional inputs required. Furthermore, we have shown that the stability of top-cell materials for tandems is paramount, to avoid the premature demise of the underlying silicon bottom cell.The end-of-life has been assumed to be landfill in most preceding LCA studies but there is a growing global need for PV recycling due to the rapid rise in uptake of photovoltaics, which will result in a significant future waste stream. Europe is leading the world in requiring industry stewardship for photovoltaics (and batteries, inverters and other system components) and other jurisdictions, including Australia, are following. However, photovoltaic modules are difficult to dismantle or deconstruct for materials recovery by methods that are both financially and environmentally sustainable. We will use LCA to guide our research on module recycling by chemical, thermal and mechanical methods and their combinations, with an aim to maximize the value of the recovered materials.

scholarly journals Environmental Benefit of Alternative Binders in Construction Industry: Life Cycle Assessment

Environments ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 6
Author(s):  
Girts Bumanis ◽  
Aleksandrs Korjakins ◽  
Diana Bajare
Keyword(s):  
Carbon Dioxide ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
Environmental Impact ◽  
Co2 Emissions ◽  
Building Materials ◽  
Positive Impact ◽  
Environmental Benefits ◽  
Raw Material ◽  
Environmental Benefit

Carbon dioxide (CO2) emissions associated with Portland cement (PC) production is ranked as the highest among the construction materials and it is estimated that 8% of the worlds CO2 discharges is due to PC production. As an average, the production of PC clinker including calcination process generates 0.81 kg of carbon dioxide per one kg of cement. Hence, new approaches which limit the negative environmental impacts of cement production and are aimed at the development of advanced methodologies are introduced. Implementation of lower energy consumption materials in production, which could moderately substitute PC in binders, can be addressed as one of the probable methods in mitigating environmental risks. Therefore, alternative binders fit into the most promising solutions. Present research investigates the environmental impact of the building sector, if an alternative to PC binder is used. Life cycle assessment (LCA) was used in this research to assess the environmental impact of the alternative ternary gypsum-PC-pozzolan binder in the production of mortar, and the environmental benefits were calculated and compared to traditional cement-based building materials. Phosphogypsum was considered as a secondary raw material, as in the current approach it is collected in open stacks bringing environmental concerns. SimaPro LCA software with the Ecoinvent database was used for most of the calculation processes. Results indicate that with alternative binders up to 30% of energy can be saved and 57 wt.% of CO2 emissions can be reduced, bringing positive impact on the construction industries contribution to the environment.

Biohydrogen: A life cycle assessment and comparison with alternative low-carbon production routes in UK

2021 ◽  
pp. 128886
Author(s):  
Gema Amaya-Santos ◽  
Suviti Chari ◽  
Alex Sebastiani ◽  
Fabio Grimaldi ◽  
Paola Lettieri ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Low Carbon ◽  
Carbon Production

scholarly journals Life Cycle Assessment of Direct Air Carbon Capture and Storage with Low-Carbon Energy Sources

2021 ◽  
Author(s):  
Tom Terlouw ◽  
Karin Treyer ◽  
christian bauer ◽  
Marco Mazzotti
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Carbon Capture ◽  
Large Scale ◽  
Carbon Capture And Storage ◽  
Low Carbon ◽  
Solid Sorbent ◽  
Low Carbon Energy ◽  
And Storage ◽  
Limited Scope

Prospective energy scenarios usually rely on Carbon Dioxide Removal (CDR) technologies to achieve the climate goals of the Paris Agreement. CDR technologies aim at removing CO2 from the atmosphere in a permanent way. However, the implementation of CDR technologies typically comes along with unintended environmental side-effects such as land transformation or water consumption. These need to be quantified before large-scale implementation of any CDR option by means of Life Cycle Assessment (LCA). Direct Air Carbon Capture and Storage (DACCS) is considered to be among the CDR technologies closest to large-scale implementation, since first pilot and demonstration units have been installed and interactions with the environment are less complex than for biomass related CDR options. However, only very few LCA studies - with limited scope - have been conducted so far to determine the overall life-cycle environmental performance of DACCS. We provide a comprehensive LCA of different low temperature DACCS configurations - pertaining to solid sorbent-based technology - including a global and prospective analysis.

The ecological footprint evaluation of low carbon campuses based on life cycle assessment: A case study of Tianjin, China

2017 ◽  
Vol 144 ◽  
pp. 266-278 ◽  
Author(s):  
Hongbo Liu ◽  
Xinghua Wang ◽  
Jiangye Yang ◽  
Xia Zhou ◽  
Yunfeng Liu
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Ecological Footprint ◽  
Low Carbon
Sign in / Sign up

Export Citation Format

Share Document