Dynamics of the behaviour of a vertical wetland (French system) operating in warm-climate conditions, evaluated by means of variables continuously measured in situ

The sewage treatment system in this study was operated with only the first stage of a French system of vertical wetlands, composed of two units in parallel and running with an extended feeding cycle (7 days). This research sought to evaluate and relate continuous variables measured in situ (dissolve...

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Bibliographic Details
Published in:Water science and technology 2020-09, Vol.82 (5), p.954-966
Main Authors: A de Andrade Moraes, Mirene, Zumalacarregui, Jorge A García, Trein, Camila Maria, von Sperling, Marcos
Format: Article
Language:English
Subjects:
Aeration
Chemical oxygen demand
Climate
Climatic conditions
Continuity (mathematics)
Dissolved oxygen
Effluents
Evaluation
Feed cycles
Feeds
Hydraulic loading
Load distribution
Loading rate
Nitrification
Oxidoreductions
Oxygen
Parameters
Percolation
pH effects
Redox potential
Sewage
Sewage treatment
Sludge
Vertical profiles
Wastewater treatment
Wetlands
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Summary:The sewage treatment system in this study was operated with only the first stage of a French system of vertical wetlands, composed of two units in parallel and running with an extended feeding cycle (7 days). This research sought to evaluate and relate continuous variables measured in situ (dissolved oxygen (DO), pH and redox potential) throughout the feeding cycle, with measurements at distinct heights along the filter vertical profile. Additionally, the influence of the surface organic sludge deposit was investigated. A close link between the hydraulic behaviour and the effluent quality was verified, with both being related to the batch volume and the instantaneous hydraulic loading rate. The drop in DO as the feed days progressed could be related to the loss of hydraulic conductivity. A thicker sludge layer decreased the aeration capacity of the filter. The effluent was observed to be aerated when percolating through the medium. DO and pH data suggested that nitrification varied along the filter depth, the batch duration and the feed cycle. The monitored parameters may be indicative of the behaviour of other parameters.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2020.399