... ORGANIC MATTER DISTRIBUTION OF THE ROOT ZONE IN A CONSTRUCTED SUBSURFACE FLOW WETLAND (Le Anh Tuan and Guido Wyseure) 4 In analysis, data were compared graphically and by an ANOVA analysis at ... precipitation processes in the soil and by microbiological degradation. Finally, the treated wastewater flows out in the bed. The wastewater is therefore not causing any odour or mosquito breeding ... operation and maintain as well (Watson and Hobson, 1989, Kadlec and Knight, 1996, Mitsch and Gosselink, 2000). They form one possible promising and feasible approach for a small scale decentralized...