Sustainability of global small-scale constructed wetlands for multiple pollutant control

196 qualified publications involving 364 CW sites were used to extract information related to water quality parameters. The following information from each original paper: (1) location, including latitude, longitude, country, and continent; (2) CW types, i.e., free water surface flow CWs (FWSCWs), subsurface flow CWs (SSFCWs), floating CWs (FCWs) and hybrid CWs (HCWs)8,57; (3) area (m2); (4) removal efficiency (%) and loading rate (g m-2 d-1) of TN, TP, COD, and NH4+-N.