Diederik Rousseau | UNESCO-IHE Institute for Water Education (original) (raw)

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Papers by Diederik Rousseau

Research paper thumbnail of Impact of operational maintenance on the asset life of storm reed beds

Research paper thumbnail of Constructed wetlands in Flanders: a performance analysis

During the last decade, the number of constructed wetlands in Flanders (Belgium) increased expone... more During the last decade, the number of constructed wetlands in Flanders (Belgium) increased exponentially. Extensive data collection resulted in a database of 107 constructed wetlands that was used to evaluate certain trends and treatment performances. Design sizes vary between 1 and 2000 population equivalents (PE), with the majority of reed beds having a size smaller than 500 PE. Most reed beds are used as single treatment units, although they are sometimes also combined with other reed beds or even conventional systems. The main purpose is to treat domestic and dairy wastewater. Average removal efficiencies were lowest with free-water-surface (FWS) reed beds (chemical oxygen demand (COD), 61%; suspended solids (SS), 75%; total nitrogen (TN), 31% and total phosphorus (TP), 26%). The best overall performance was obtained with vertical flow (VF) wetlands (COD, 94%; SS, 98%; TN, 52%; TP, 70%), except for total nitrogen removal where combined reed bed systems even did better (COD, 91%; SS, 94%; TN, 65%; TP, 52%). Despite this considerable achievement in removal, the effluent nutrient concentrations of many systems remain too high and entail a tangible danger of eutrophication.

Research paper thumbnail of Constructed wetlands in Flanders: a performance analysis

During the last decade, the number of constructed wetlands in Flanders (Belgium) increased expone... more During the last decade, the number of constructed wetlands in Flanders (Belgium) increased exponentially. Extensive data collection resulted in a database of 107 constructed wetlands that was used to evaluate certain trends and treatment performances. Design sizes vary between 1 and 2000 population equivalents (PE), with the majority of reed beds having a size smaller than 500 PE. Most reed beds are used as single treatment units, although they are sometimes also combined with other reed beds or even conventional systems. The main purpose is to treat domestic and dairy wastewater. Average removal efficiencies were lowest with free-water-surface (FWS) reed beds (chemical oxygen demand (COD), 61%; suspended solids (SS), 75%; total nitrogen (TN), 31% and total phosphorus (TP), 26%). The best overall performance was obtained with vertical flow (VF) wetlands (COD, 94%; SS, 98%; TN, 52%; TP, 70%), except for total nitrogen removal where combined reed bed systems even did better (COD, 91%; SS, 94%; TN, 65%; TP, 52%). Despite this considerable achievement in removal, the effluent nutrient concentrations of many systems remain too high and entail a tangible danger of eutrophication.

Research paper thumbnail of Model-based design of horizontal subsurface flow constructed treatment wetlands: a review

Water research, Jan 1, 2004

Research paper thumbnail of Development of a risk assessment based technique for design/retrofitting of WWTPs

Water Science and …, Jan 1, 2001

Research paper thumbnail of A quantitative risk analysis tool for design/simulation of wastewater treatment plants

Water Science & …, Jan 1, 2002

Research paper thumbnail of Performance of constructed treatment wetlands: model-based evaluation and impact of operation and maintenance

Research paper thumbnail of Tertiary treatment of the liquid fraction of pig manure with Phragmites australis

Water, Air, & Soil …, Jan 1, 2005

Research paper thumbnail of Impact of prior physico-chemical treatment on the clogging process of subsurface flow constructed wetlands: Model-based evaluation

Water, Air, & Soil …, Jan 1, 2007

Research paper thumbnail of Short-term behaviour of an experimental constructed wetland at low temperatures

Mededelingen- …, Jan 1, 2001

• Despite the low temperatures (-1 °C till +9 °C), all legal standards for small scale WWTPs (250... more • Despite the low temperatures (-1 °C till +9 °C), all legal standards for small scale WWTPs (250 mg COD/l; 50 mg BOD/l; 60 mg SS/l) were largely met. Effluent concentrations even complied with the standards for large scale WWTPs except for nitrogen (125 mg COD/l; 25 mg ...

Research paper thumbnail of Model Study of Short-Term Dynamics of Secondary Treatment Reed Beds at Saxby(Leicestershire, UK)

… and Health, Part A: …, Jan 1, 2003

Research paper thumbnail of CWM 1: a general model to describe biokinetic processes in subsurface flow constructed wetlands

Water Science & …, Jan 1, 2009

Research paper thumbnail of A comparative study of surface and subsurface flow constructed wetlands for treatment of combined sewer overflows: A greenhouse experiment

ecological …, Jan 1, 2009

Research paper thumbnail of Impact of operational maintenance on the asset life of storm reed beds

Research paper thumbnail of Constructed wetlands in Flanders: a performance analysis

During the last decade, the number of constructed wetlands in Flanders (Belgium) increased expone... more During the last decade, the number of constructed wetlands in Flanders (Belgium) increased exponentially. Extensive data collection resulted in a database of 107 constructed wetlands that was used to evaluate certain trends and treatment performances. Design sizes vary between 1 and 2000 population equivalents (PE), with the majority of reed beds having a size smaller than 500 PE. Most reed beds are used as single treatment units, although they are sometimes also combined with other reed beds or even conventional systems. The main purpose is to treat domestic and dairy wastewater. Average removal efficiencies were lowest with free-water-surface (FWS) reed beds (chemical oxygen demand (COD), 61%; suspended solids (SS), 75%; total nitrogen (TN), 31% and total phosphorus (TP), 26%). The best overall performance was obtained with vertical flow (VF) wetlands (COD, 94%; SS, 98%; TN, 52%; TP, 70%), except for total nitrogen removal where combined reed bed systems even did better (COD, 91%; SS, 94%; TN, 65%; TP, 52%). Despite this considerable achievement in removal, the effluent nutrient concentrations of many systems remain too high and entail a tangible danger of eutrophication.

Research paper thumbnail of Constructed wetlands in Flanders: a performance analysis

During the last decade, the number of constructed wetlands in Flanders (Belgium) increased expone... more During the last decade, the number of constructed wetlands in Flanders (Belgium) increased exponentially. Extensive data collection resulted in a database of 107 constructed wetlands that was used to evaluate certain trends and treatment performances. Design sizes vary between 1 and 2000 population equivalents (PE), with the majority of reed beds having a size smaller than 500 PE. Most reed beds are used as single treatment units, although they are sometimes also combined with other reed beds or even conventional systems. The main purpose is to treat domestic and dairy wastewater. Average removal efficiencies were lowest with free-water-surface (FWS) reed beds (chemical oxygen demand (COD), 61%; suspended solids (SS), 75%; total nitrogen (TN), 31% and total phosphorus (TP), 26%). The best overall performance was obtained with vertical flow (VF) wetlands (COD, 94%; SS, 98%; TN, 52%; TP, 70%), except for total nitrogen removal where combined reed bed systems even did better (COD, 91%; SS, 94%; TN, 65%; TP, 52%). Despite this considerable achievement in removal, the effluent nutrient concentrations of many systems remain too high and entail a tangible danger of eutrophication.

Research paper thumbnail of Model-based design of horizontal subsurface flow constructed treatment wetlands: a review

Water research, Jan 1, 2004

Research paper thumbnail of Development of a risk assessment based technique for design/retrofitting of WWTPs

Water Science and …, Jan 1, 2001

Research paper thumbnail of A quantitative risk analysis tool for design/simulation of wastewater treatment plants

Water Science & …, Jan 1, 2002

Research paper thumbnail of Performance of constructed treatment wetlands: model-based evaluation and impact of operation and maintenance

Research paper thumbnail of Tertiary treatment of the liquid fraction of pig manure with Phragmites australis

Water, Air, & Soil …, Jan 1, 2005

Research paper thumbnail of Impact of prior physico-chemical treatment on the clogging process of subsurface flow constructed wetlands: Model-based evaluation

Water, Air, & Soil …, Jan 1, 2007

Research paper thumbnail of Short-term behaviour of an experimental constructed wetland at low temperatures

Mededelingen- …, Jan 1, 2001

• Despite the low temperatures (-1 °C till +9 °C), all legal standards for small scale WWTPs (250... more • Despite the low temperatures (-1 °C till +9 °C), all legal standards for small scale WWTPs (250 mg COD/l; 50 mg BOD/l; 60 mg SS/l) were largely met. Effluent concentrations even complied with the standards for large scale WWTPs except for nitrogen (125 mg COD/l; 25 mg ...

Research paper thumbnail of Model Study of Short-Term Dynamics of Secondary Treatment Reed Beds at Saxby(Leicestershire, UK)

… and Health, Part A: …, Jan 1, 2003

Research paper thumbnail of CWM 1: a general model to describe biokinetic processes in subsurface flow constructed wetlands

Water Science & …, Jan 1, 2009

Research paper thumbnail of A comparative study of surface and subsurface flow constructed wetlands for treatment of combined sewer overflows: A greenhouse experiment

ecological …, Jan 1, 2009