An integrated model of substrate clogging in vertical

18 This paper presented an integrated conceptual model to describe the substrate 19 clogging in constructed treatment wetland. The model is based on pore space 20 reduction of the wetland substrate during the integrated treatment processes including 21 physical, biological and plant-related processes. A group of laboratory scale 22 constructed wetlands (CWs) was employed to set up the experimental trial, from 23 which the model was developed. Comparative results obtained from the experiments 24 and the literature indicated that the model predictions of the wetland clogging time are 25 reasonably agreed each other. Additionally, this model seems reasonable to 26 quantitatively simulate the contribution of the accumulated inert suspended solids, 27 microbial biomass and plant roots clog material to the pore space reduction with 28 wetland operation time. Accordingly, it is reasonable to believe that the model can be 29 used for estimating clogging time of CWs in different operation conditions. 30