Recycling of oil sludge together with construction and demolition waste into building materials in Tanzania

The disposal of oil sludge together with construction and demolition waste in Tanzania is still a challenge in both space and technology. In order to reduce the space requirement for oil sludge together with construction and demolition waste disposal, the recycling of these waste becomes a vital option. This paper is mainly concerned with the determination on the possibility of recycling the oil sludge together with construction and demolition waste into building material in Tanzania. The materials used were oil sludge from oil re-refining industry, construction and demolition (CD in future, the metal concentration in the soil is expected to accumulate, which will result into negative impacts in relation to the environment. In the recycling process, different mix ratios of cement, oil sludge and C&D waste were applied. The experiment was meant to determine the optimal mixing ratio. This study demonstrated that the oil re-refined sludge together with construction and demolition waste can be recycled into building material in Tanzania and hence reduce their adverse impacts to the environment.   Key words: Recycling, oil sludge, construction and demolition waste, building materials.