The potential purification of an horizontal subsurface flow constructed wetlands (HSSFCW)
treating greywater in a Moroccan primary school was investigated according to the monitoring
of water quality parameters over a period of 100 days through two simultaneous
stages: first, an internal three dimensional grid of sampling ports; secondly, an entry and
exit. The calibration ofthe relaxed TIS concentration model based on tank in series hydraulic
assumption with experimental data gave the frequency distribution profiles of K-rate constant
values for the three parameters: BOD5, COD and TN, whose maximum values are
respectively 50m/yr, 70m/yr, and 42m/yr. The HSSFCW system has higher K-rate coeffi-
cient for all the three parameters at the bottom layer compared with the surface layer,
with increasing K-rates over length. The analysis of bacteriological and chemical results
has shown that the HSSFCW could not completely remove all pollutants (especially TN and
TP), but it could be used successfully to upgrade the quality of greywater to an acceptable
level. However, we predict that there will be an increase in removal efficiencies with time
bearing in mind that the system is newly implemented.
© 2015 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.