Simulation of the hydraulics and treatment performance of horizontal subsurface flow constructed wetland treating greywater
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Date
2018-05-10Author
Raude, James M.
Mutua, Benedict M.
Kamau, David Ngugi
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Constructed wetlands (CWs) have evolved as some of reliable wastewater treatment technologies. Various types
of CWs differ in their main design characteristics and in processes responsible for pollutant removal. Classification of CWS is
based on the type of vegetation used and hydrological parameters involved and can thus be classified as free water surface or
subsurface flow systems. Further, subsurface flow systems can be classified according to flow direction as vertical or
horizontal. This study considers horizontal subsurface flow constructed wetlands (HSFCWs) which introduces the mechanistic,
dynamic compartmental model-Constructed Wetlands 2D (CW2D). The model has successfully been utilized to evaluate the
performance of vertical flow constructed wetlands and is being tested on HFCWs. An outdoor pilot scale HSFCW system was
established in Nakuru, Kenya. CW2D was calibrated, validated and used to simulate hydraulic performance of HSFCW
system. The model was used in predicting effluent concentrations of the main greywater pollutants. In general, the results
obtained showed a good match with the measured data. CW2D is an effective tool for evaluating the performance of CWs and
can provide insights in treatment problems at an existing CW. The same methodology can be used to optimize existing
systems.
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