Abstract：A conceptional model for prediction of organic matter removal with TOC as the check index in horizontal subsurface constructed wetlands was developed. The values of the unknown parameters in the model were estimeted by fitting the conceptional model to one set of the experimental data. Then model was valided by another set of the experimental data. The predicted effluent concentrations were well close to the actual effluent concentrations. The removal rate of TOC for domestic sewage in the constructed wetland with Arundo donax var.versicolor and the controlled constructed wetland were 92% and 91%, respectively. The major organic matter removal process was biodegradation, contributing 84% of the TOC removal. Plant had a little impact to TOC removal.
