This is followed by the nitrogen cycle with much emphasis on de-nitrification, the bacteria responsible and the substrate they feed on. It discovers that, the suitability of different domestic wastes such as (pine bark, vegetable waste, commercial garden refuse, fresh and immature composted garden refuse etc.) are easily accessible and relatively cheap. The study concludes by suggesting the usage of the CGRraw, 25/75 mix substrate and fresh composted commercial garden refuse because they are said to produce better suitability than others and that they denitrify within the stipulated time. | Suitability of different domestic wastes for denitrification of landfill leachate using characterization and batch tests