Using one filter stage of unsaturated/saturated vertical flow filters for nitrogen removal and footprint reduction of constructed wetlands

French vertical flow constructed wetlands (VFCW) treating raw wastewater have been developed successfully over the last 30 years. Nevertheless, the two-stage VFCWs require a total filtration area of 2-2.5 m /P.E. Therefore, implementing a one-stage system in which treatment performances reach standa...

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Veröffentlicht in:Water science and technology 2017-07, Vol.76 (1-2), p.124-133
Hauptverfasser: Morvannou, Ania, Troesch, Stéphane, Esser, Dirk, Forquet, Nicolas, Petitjean, Alain, Molle, Pascal
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container_end_page 133
container_issue 1-2
container_start_page 124
container_title Water science and technology
container_volume 76
creator Morvannou, Ania
Troesch, Stéphane
Esser, Dirk
Forquet, Nicolas
Petitjean, Alain
Molle, Pascal
description French vertical flow constructed wetlands (VFCW) treating raw wastewater have been developed successfully over the last 30 years. Nevertheless, the two-stage VFCWs require a total filtration area of 2-2.5 m /P.E. Therefore, implementing a one-stage system in which treatment performances reach standard requirements is of interest. Biho-Filter is one of the solutions developed in France by Epur Nature. Biho-Filter is a vertical flow system with an unsaturated layer at the top and a saturated layer at the bottom. The aim of this study was to assess this new configuration and to optimize its design and operating conditions. The hydraulic functioning and pollutant removal efficiency of three different Biho-Filter plants commissioned between 2011 and 2012 were studied. Outlet concentrations of the most efficient Biho-Filter configuration are 70 mg/L, 15 mg/L, 15 mg/L and 25 mg/L for chemical oxygen demand (COD), 5-day biological oxygen demand (BOD ), total suspended solids (TSS) and total Kjeldahl nitrogen (TKN), respectively. Up to 60% of total nitrogen is removed. Nitrification efficiency is mainly influenced by the height of the unsaturated zone and the recirculation rate. The optimum recirculation rate was found to be 100%. Denitrification in the saturated zone works at best with an influent COD/NO -N ratio at the inflet of this zone larger than 2 and a hydraulic retention time longer than 0.75 days.
doi_str_mv 10.2166/wst.2017.115
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Aeration zone
Artificial wetlands
Biochemical oxygen demand
Biological Oxygen Demand Analysis
Chemical oxygen demand
Denitrification
Design optimization
Engineering
Environmental Sciences
Filtration - instrumentation
Filtration - methods
Flow system
Fluid filters
France
Hydraulic retention time
Hydraulics
Influents
International conferences
Nitrification
Nitrogen
Nitrogen - chemistry
Nitrogen removal
Oxygen demand
Plants (botany)
Pollutant removal
Raw wastewater
Removal
Retention time
Saturated flow
Solutions
Suspended particulate matter
Total oxygen demand
Total suspended solids
Unsaturated flow
Vertical flow
Vertical mixing
Waste Disposal, Fluid
Waste Water - chemistry
Wastewater
Wastewater treatment
Water Purification - instrumentation
Water Purification - methods
Wetlands
title Using one filter stage of unsaturated/saturated vertical flow filters for nitrogen removal and footprint reduction of constructed wetlands
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