Leachate Treatment Using Constructed Wetlands Technique

Abstract

Constructed wetland treatment was an engineered method of purifying waste water by letting it through soil filters on which natural wetland species are grown. It was considered as an effective and reliable treatment and has found wide usage. The main study of this research is to study the best effective method for treating Leachate using constructed wetlands technique. The pollutants were removed by various physical, chemical and biogeochemical processes like sedimentation, absorption, nitrification and phytoremediation. The aim of this research was to study the effectiveness of the wetland plant Typha in the treatment of Leachate wastewater. A model wetland unit of length, width and depth of 60 cm, 40 cm and 30cm, respectively was built with slight slope of 1% between inlet and outlet zones. Typha Species were transplanted into the model unit and subjected to industrial wastewater. As the leachate has more toxic materials in it, we can't use the leachate directly into the wetlands. In this study, Leachate and domestic sewage water was mixed in 1:2 ratios and then used in the constructed wetland. Reduction in BOD and COD values was about 70-75% and 75% respectively in five days and completely below the discharge limits.