Modified First Stage of French Vertical Flow Constructed Wetlands performance during extreme operation conditions
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
INRAE, INSA
Abstract
This study applied two Modified First Stage of French Vertical Flow Constructed Wetlands pilots
for the treatment of sewage coming from a combined sewer system under extreme hydraulic loads
and medium temperatures at high altitude. Particularly, the pilot-scale experiment was conducted
within nine months after their start-up period of four months. During this period, two different
high hydraulic loading rates (0.94 m d-1 and 0.56 m d-1) representing 2.5 and 1.5 times the design
values respectively, were applied to investigate the impact of HLRs on the performance of the
treatment system. The observed performances for COD and TSS removals were satisfactory, with
average values of 53% and 66% respectively. Moreover, reducing the HLR resulted in higher
removal efficiency for COD (from 46% to 64%) but not for TSS (from 67% to 64%). From these
findings, it is suggested that high HLRs can be applied for the First Stage of the French System
without compromising the operation of the units and obtaining satisfactory results, especially in
case of diluted wastewater and severe area restrictions.
Resumen
Keywords
First stage of French vertical flow constructed wetlands, Hydraulic loading rate, Municipal wastewater, Tropical Andes