Constructed wetlands for CSO treatment: an overview of practice and research in Germany

2005 ◽  
Vol 51 (9) ◽  
pp. 23-30 ◽  
Author(s):  
M. Uhl ◽  
U. Dittmer
Keyword(s):  
Constructed Wetlands ◽  
Research Work ◽  
Treatment Wetlands ◽  
Vertical Flow ◽  
Removal Rates ◽  
Term Operation ◽  
Combined Sewage Overflow ◽  
Flow Treatment

Vertical flow treatment wetlands have been developed as very useful tools for treatment of combined sewage overflow. Several systems have been in operation for over 15 years. Based on recent research work, new technical guidelines now recommend systems with a drained filter of sand 0/2 mm and a throttled outflow. COD, NH4-N and SS removal rates of 85–99% can be expected from this type of filter. SS loadings that are too high and very long or frequent inundation affect the performance adversely. Information for successful long-term operation were derived from various existing plants.

scholarly journals Treatment performances of French constructed wetlands: results from a database collected over the last 30 years

2015 ◽  
Vol 71 (9) ◽  
pp. 1333-1339 ◽  
Author(s):  
A. Morvannou ◽  
N. Forquet ◽  
S. Michel ◽  
S. Troesch ◽  
P. Molle
Keyword(s):  
Constructed Wetlands ◽  
Oxygen Demand ◽  
Pollutant Removal ◽  
Vertical Flow ◽  
Removal Rates ◽  
Waste Stabilization Ponds ◽  
Small Communities ◽  
Technical Department ◽  
In Series ◽  
High Chemical Oxygen Demand

Approximately 3,500 constructed wetlands (CWs) provide raw wastewater treatment in France for small communities (<5,000 people equivalent). Built during the past 30 years, most consist of two vertical flow constructed wetlands (VFCWs) in series (stages). Many configurations exist, with systems associated with horizontal flow filters or waste stabilization ponds, vertical flow with recirculation, partially saturated systems, etc. A database analyzed 10 years earlier on the classical French system summarized the global performances data. This paper provides a similar analysis of performance data from 415 full-scale two-stage VFCWs from an improved database expanded by monitoring data available from Irstea and the French technical department. Trends presented in the first study are confirmed, exhibiting high chemical oxygen demand (COD), total suspended solids (TSS) and total Kjeldahl nitrogen (TKN) removal rates (87%, 93% and 84%, respectively). Typical concentrations at the second-stage outlet are 74 mgCOD L−1, 17 mgTSS L−1 and 11 mgTKN L−1. Pollutant removal performances are summarized in relation to the loads applied at the first treatment stage. While COD and TSS removal rates remain stable over the range of applied loads, the spreading of TKN removal rates increases as applied loads increase.

Resilience and reliability of compact vertical-flow treatment wetlands designed for tropical climates

2018 ◽  
Vol 642 ◽  
pp. 208-215 ◽  
Author(s):  
R. Lombard-Latune ◽  
L. Pelus ◽  
N. Fina ◽  
F. L'Etang ◽  
B. Le Guennec ◽  
...  
Keyword(s):  
Treatment Wetlands ◽  
Vertical Flow ◽  
Tropical Climates ◽  
Flow Treatment

scholarly journals Assessment of spatial representativity of X-ray tomography to study Vertical Flow Treatment wetlands

2020 ◽  
Vol 713 ◽  
pp. 136510 ◽  
Author(s):  
German Dario Martinez-Carvajal ◽  
Laurent Oxarango ◽  
Rémi Clément ◽  
Pascal Molle ◽  
Nicolas Forquet
Keyword(s):  
Treatment Wetlands ◽  
Vertical Flow ◽  
X Ray ◽  
Flow Treatment

French vertical flow treatment wetlands in a subtropical climate: Characterization of the organic deposit layer and comparison with systems in France

2020 ◽  
Vol 742 ◽  
pp. 140608
Author(s):  
Camila Maria Trein ◽  
Camille Banc ◽  
Kevin Maciejewski ◽  
Amanda de Moraes Motta ◽  
Rémy Gourdon ◽  
...  
Keyword(s):  
Treatment Wetlands ◽  
Subtropical Climate ◽  
Vertical Flow ◽  
Flow Treatment ◽  
Deposit Layer ◽  
Organic Deposit

ALKALINITY GENERATION AND METALS RETENTION IN VERTICAL-FLOW TREATMENT WETLANDS

2000 ◽  
Vol 2000 (1) ◽  
pp. 412-420 ◽  
Author(s):  
Robert W. Nairn ◽  
Matthew N. Mercer ◽  
Stephanie A. Lipe
Keyword(s):  
Treatment Wetlands ◽  
Vertical Flow ◽  
Alkalinity Generation ◽  
Flow Treatment

scholarly journals Performance and reliability comparison of French vertical flow treatment wetlands with other decentralized wastewater treatment technologies in tropical climates

2020 ◽  
Vol 82 (8) ◽  
pp. 1701-1709
Author(s):  
Rémi Lombard-Latune ◽  
Florent Leriquier ◽  
Chafatayne Oucacha ◽  
Lucas Pelus ◽  
Gérald Lacombe ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Wetlands ◽  
Vertical Flow ◽  
Small Communities ◽  
Decentralized Wastewater Treatment ◽  
Treatment Technologies ◽  
Rotating Biological Contactors ◽  
Overseas Territories ◽  
Flow Treatment

Abstract When implementing a sanitation system, the selection of treatment process can be difficult. Beyond removal efficiency and effluent concentrations, reliability should be taken into account. This study compares reliability of French vertical flow treatment wetlands (F-VFTW) with the four main decentralized wastewater treatment technologies in small communities in the French Overseas Territories (FOT). Analysis of 963 regulatory self-monitoring sampling campaigns performed on 213 wastewater treatment plants show that operational disruptions due to sludge loss and loss of nitrification are often reported for activated sludge technology; rotating biological contactors often suffer from weak settlement; facultative pond removal is limited by algae; and F-VFTW fulfills all the French regulatory objectives at a frequency of 90 to 95%. In addition, the data from this study are compared to a similar database from Brazil using a statistical approach (coefficient of reliability). Amongst the eight decentralized wastewater treatment technologies evaluated, F-VFTW appears to be the most appropriate for achieving the discharge standard with a reliability close to 95%. Its reliability to face both environmental (rainfall) and social (maintenance capacities) constraints is a key parameter.

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