Life cycle assessment of environmental impacts and energy demand for capacitive deionization technology

Assessment of life cycle environmental impacts and cumulative energy demand on a laboratory-scale capacitive deionizing (CDI) of brackish water was conducted in this study. The CDI system presented advantages of low energy demand at operation phase and low energy-related environmental impacts. With...

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Bibliographic Details
Published in:Desalination 2016-12, Vol.399, p.53-60
Main Authors: Yu, Ting-Hua, Shiu, Huan-Yu, Lee, Mengshan, Chiueh, Pei-Te, Hou, Chia-Hung
Format: Article
Language:English
Subjects:
Activated carbon electrode
Assessments
Brackish
Brackish water
Capacitive deionization
Deionization
Demand
Desalination
Electricity consumption
Environmental impact
Environmental performance
Life cycle assessment
Low energy demand
Ozone depletion
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Summary:Assessment of life cycle environmental impacts and cumulative energy demand on a laboratory-scale capacitive deionizing (CDI) of brackish water was conducted in this study. The CDI system presented advantages of low energy demand at operation phase and low energy-related environmental impacts. With a measured electricity consumption for CDI operation at 1.44MJ (0.4kWh), the total cumulative energy demand for CDI system was estimated at approximately 23.9MJ for production of 1m3 of desalinated water. Results from the impact assessment indicated a global warming potential (GMP100) at 1.43kg CO2 eq, which was mainly attributed to the major reduction in electricity consumption as compared to conventional desalination technologies. Moreover, material utilization and chemical use were shown to be most responsible for overall environmental impacts in the CDI system, particularly for the use of N,N-dimethylacetamide (solvent) and titanium (material for current collector). Use of such chemicals might produce derivatives that contributed to major impacts in ozone depletion and acidification potentials. This suggests that additional efforts in future studies of CDI system may be made to substitute or reduce the two to enhance overall environmental performance of the system. [Display omitted] •Capacitive deionization is an environmentally friendly desalination technology.•Cumulative energy demand was the highest at operation phase.•Energy-related environmental impacts were lowest for electricity consumption.•Material and chemical uses contributed to most of the environmental impacts.•Decrease in use of Ti and DMAC is essential.
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2016.08.007