Abstract:
In Sri Lanka, the Municipal Solid Waste is disposed in to sanitary landfills or dumping sites. The
generated leachate at dumping sites causes many problems leading to various social, cultural, environmental
impacts. Hence, it is decided to conduct this research to find out suitable solution for proper treatment for the
leachate generated at waste disposal sites. In this research, two stage biological treatment processes were used to
treat the leachate. At first stage up flow anaerobic sludge blanket (UASB) is used. The important of the UASB is it
removes high amount of BOD5 and COD in efficiently. However the UASB process is not capable for removing fair
amount of nutrients. To overcome this problem an aerobic system sequence batch reactor (SBR) was used after the
UASB. The specific task of this introducing this SBR system is to study the capabilities of removing nitrogen in
leachate treatment. In the total system, the BOD5 removal efficiency is around 92% and COD removal efficiency is
reached to 54%. Therefore this system can be used as secondary treatment system, to treat leachate.
