In recent years, agricultural, industrial, and economic growth has been on a rise which is contributing to an improved quality and well-being of citizens.Due to the increase in the world‘s population and most of it moving to urban cities, there is increased demand for food, and this has resulted in the production of large amounts of world‘s population(Sabiti, 2011). However, wastes and by-products are created by the production systems which inevitably affect the environment. Some agricultural wastes emit methane and leachate when rotten, while some open burning by farmers to clear the lands, generates CO2and other local pollutants (UNEP, 2009).These wastes can be generated at any point in the production cycle, whether during obtaining the raw materials, transformation and production, or when the end user disposes the products which are no longer needed.
The enormous amount of waste generated is still far from being used in its totality, making technological alternatives imperative to reduce its possible environmental impact such as leaching of potentially toxic substances into soils and groundwater, reductions in plant establishment and growth due primarily to adverse chemical characteristics of the waste. Other effects are, changes in elemental composition of vegetation growing on the waste and an increased mobility as well as accumulation of potentially toxic elements throughout food chain.