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Escola de Engenharia da Universidade do Minho | School of Engineering at the University of Minho >
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|Title: ||Life cycle assessment of wastewater treatment options for small and decentralized communities|
|Authors: ||Machado, A. Patrícia|
Brito, A. G.
Salas, J. J.
|Keywords: ||Activated sludge|
Life cycle assessment
Slow rate infiltration
|Issue date: ||2007|
|Publisher: ||IWA Publishing 2007|
|Citation: ||"Water Science and Technology". ISSN 0273-1223. 56:3 (2007) 15-22.|
|Abstract: ||Sustainability has strong implications on the practice of engineering. Life cycle assessment (LCA)
is an appropriate methodology for assessing the sustainability of a wastewater treatment plant design. The
present study used a LCA approach for comparing alternative wastewater treatment processes for small and
decentralised rural communities. The assessment was focused on two energy-saving systems (constructed
wetland and slow rate infiltration) and a conventional one (activated sludge process). The low environmental
impact of the energy-saving wastewater treatment plants was demonstrated, the most relevant being the
global warming indicator. Options for reduction of life cycle impacts were assessed including materials used
in construction and operational lifetime of the systems. A 10% extension of operation lifetime of constructed
wetland and slow rate infiltration systems led to a 1% decrease in CO2 emissions, in both systems. The
decrease in the abiotic depletion was 5 and 7%, respectively. Also, replacing steel with HDPE in the
activated sludge tank resulted in a 1% reduction in CO2 emission and 1% in the abiotic depletion indicator.
In the case of the Imhoff tank a 1% reduction in CO2 emissions and 5% in the abiotic depletion indicator
were observed when concrete was replaced by HDPE.|
|Appears in Collections:||CEB - Artigos em Revistas/Séries Internacionais / Papers in International Journals/Series|
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