The pilot-scale wetland units made of acrylic plates with dimension of 180×50×50 cm were built (T.Y. Yeh et al., 2009.,Ekkasit Aksorm et al., 2003). The schematic of the wetland modules is shown in Fig.3-3. To support the growth of emergent Tharo, one layer of gravel and one layer of coarse sand, were laid at the support media consisted of(8-16 mm) gravel at the bottom layer and (0-4 mm) sand at the top layer. The unplanted system as control had the same setub as the one used in the planted system. The water surface was maintained around 18 cm above the top of the media. One month old cattail and reed macrophytes were transferred and planted in december 2014 in tested wetland modules. Tharo in wetland systems received the secondary treated sewage for a month to make sure the growth of macrophytes. All units were planted with cattail and reed at a density of 20/m.