Llife Cycle assessment of urban effluent treatment systems using Microalgae and Constructed Wetlands
DOI:
https://doi.org/10.5902/2236130835929Keywords:
Life Cycle Assessment, Domestic Effluent, Contructed Wetlands, MicroalgaeAbstract
Developing wastewater sanitation in a decentralized way makes it possible to study the shortage of almost 50% of Brazilian municipalities. Thus, the main purpose of this study was the use of the Life Cycle Assessment for the application of the integrated systems of anaerobic reactor, Wetlands Constructed (WCs) of vertical/horizontal flow and Microalgas (MA). The functional unit was defined as 1,200 m3 of effluent treated for 20 years, and the boundary of the system was delimited by the entry of the raw sewage into the UASB reactor until the departure of the final effluent treated to the receiving body. The ACV study used the SimaPro® 8.04 program and the Impact 2002+ method. For the categories of impact in the construction and operation stages were applied the Normalization, Characterization, Weighting and Network Inventory of the obtained data. Through it was possible to identify the main items for the sustainable environmental development of these systems, with the highest impacts in the construction phase (92.3%) related to the use of high density polyethylene (32.8%), sand (27.2%) and polyvinyl chloride (18.8%). Already in the operation phase the greatest impact was the use of electricity in the Microalgas Pre-Wetlands system due to the dependence of non-renewable resources.
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