Browsing by Author "Narváez Torres, Andrea Carolina"

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Evaluación y rediseño de la planta de tratamiento de aguas residuales Acchayacu, parroquia Tarqui, del cantón Cuenca, Ecuador
(2019-10-28) González Tello, Cristhian Raúl; Narváez Torres, Andrea Carolina; Alvarado Martínez, Andrés Omar
The discharge of wastewater that has not received adequate treatment to receiving corps is a serious environmental and public health problem, this problem is evident in rural areas where access to sanitation services is difficult. For the treatment of wastewater in rural areas of the city of Cuenca, the Public Company ETAPA EP has implemented small decentralized treatment plants that currently have deficiencies in treatment or are no longer in operation. This study evaluates and redesigns the treatment plant located in the community of Acchayacu, in Tarqui, with the objective of providing a definitive technical solution to the system that currently discharges into a ravine used for agricultural activities. The project included field and laboratory studies; thus, an assessment of the current state of operation of the PTAR was carried out; after that, a technology selection study was carried out followed by a proposal for redesigning the system, which consists of a preliminary treatment (bar screen and grit chamber), the readjustment of the primary treatment (septic tank), secondary treatment (vertical wetlands first stage French style) and a tertiary treatment (disinfection). As part of the detailed engineering design, the study includes construction plans, technical design report, system operation and maintenance manual and construction budget.
Performance of modified first-stage French Vertical Flow Constructed Wetlands under extreme operational conditions
(2023) Narváez Torres, Andrea Carolina; García Zumalacarregui, Jorge Alejandro; Alvarado Martínez, Andrés Omar
Operation conditions considerably affect the removal efficiency of wastewater treatment systems, and yet we still lack data on how these systems function under extreme dilution rates and climatic conditions at high altitudes. Here, we applied two modified First-Stage French Vertical Flow Constructed Wetlands (FS-FVFCWs) for sewage treatment in Northern Tropical Andes. Specifically, within 18 months, we conducted a pilot-scale experiment at two hydraulic loading rates (HLRs) of 0.94 and 0.56 m d-1, representing 2.5 and 1.5 times the recommended design values, with two different feeding/resting periods to investigate the impact of HLRs and operational strategy on system performance. We found that chemical oxygen demand (COD) and total suspended solids (TSS) removal was satisfactory, with average values of 53 ± 18 and 69 ± 16%, respectively. Moreover, reducing HLRs resulted in higher removal efficiency for COD, from 46 ± 15 to 64 ± 15%, but had no impact on TSS removal, with 3 days of feeding and 6 days of resting. For an equal time of feeding and resting, COD and TSS removals were not affected by the modified HLR. These findings suggest that high HLRs can be applied to FS-FVFCW without compromising the system operation and obtaining satisfactory results, leading to opportunities to reduce areas and costs.