Browsing by Author "Narvaez Torres, Andrea Carolina"

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Modified first stage of french vertical flow constructed wetlands for wastewater treatment in highlands: start-up of the system
(Springer Nature, 2021) García Zumalacarregui, Jorge Alejandro; Arevalo Durazno, Maria Belen; Narvaez Torres, Andrea Carolina; Alvarado Martínez, Andrés Omar
Worldwide, decentralized sanitation systems represent an appropriate, sustainable, simpler, and cost-effective option for communities where conventional wastewater treatment technologies have failed by not considering the inherent characteristics of those societies. In this research, the start-up phase of a cost-effective decentralized sanitation technology is presented: The modified first stage of French vertical flow constructed wetlands for raw wastewater treatment. In the three pilot units comprising the modified first stage, Lolium perenne was the vegetation planted and showed great adaptability to the climatic conditions of the highlands and wastewater characteristics from a combined sewerage. In order to evaluate the performance of the system, in situ parameters were measured and physical chemical analyses were performed from samples of the three units. Efficiencies over 45% were obtained for the removal of organic matter and total suspended solids. The pilots demonstrated that the first stage of French vertical flow constructed wetlands is robust and reliable from their start-up period and treating hydraulic overloads.
Treatment of faecal sludge from septic tanks using First Stage of French Vertical Flow Constructed Wetlands
(IWA. The international water asociation, 2022) Arevalo Durazno, Maria Belen; García Zumalacarregui, Jorge Alejandro; Alvarado Martínez, Andrés Omar; Tuan Ho, Long; Narvaez Torres, Andrea Carolina
Mostly disposed into the environment without any treatment, faecal sludge from septic tanks remains a critical environmental issue in major developing countries. Despite being considered an efficient natural solution for sludge treatment, Vertical Flow Constructed Wetlands have uncommonly been applied to deal with this issue. In this study, we investigated the performance of the First Stage of French Vertical Flow Constructed Wetlands as a practicable alternative for septic tank sludge treatment in the Andean region. From the results obtained during the first six months of operation, satisfactory removal efficiencies of over 40 % for COD and TS were obtained in a pilot scale. Appearing important for organic matter mineralization, high aeration capacity was maintained as showed in the DO concentrations measured in the influent and effluent, i.e. 0.33 mg.L-1 and 2.8 mg.L-1, despite the sludge load.