2.1.1. Sources of data
Primary data concerning leachate and solid waste were
obtained from Addis Ababa open solid waste dumping site, Rephi,
while black cotton soil was collected from the local
Chebi–Weregenu sanitary landfill site. Then the leachate samples
collected from Rephi open dump site were analyzed for the
presence and amount of COD, BOD5, pH, NH4
+
–N, Pb and Cu
concentration at JIJE LABOGLASS analytical testing service and
Addis Ababa environmental protection authority laboratories. The
other variables considered in this study were analyzed at
Addis Ababa Institute of Technology, School of Chemical and
Bio-Engineering Department laboratory. Soil characterization was
performed before and after treatment at the central laboratory of
the Geological Survey of Ethiopia.