**1. Introduction**

*Jatropha curcas* L. is one of growing interest in bioenergy resource. It belongs to the family Euphorbiaceae. It is perennial bush, easy to grow in tropical and subtropical regions, resistance to drought and produce crimson color flower (**Figure 1**). It is native to Mexico and Central America, but can be suitably cultivated in tropical and subtropical areas such as South East Asia. It is a small tree with height of about 6 m. *J. curcas* L. is planted principally as a hedge to prevent crop plant from the cattle, sheep and goats. Currently, jatropha is popularized as bioenergy plant due to high content of oil in the seeds. The oil from this crop is a promising alternative in biodiesel production. Utilization of jatropha oil as biodiesel feedstock is increasing as its oil is non-edible and does not compete with food crops. It helps the food security in biodiesel production. Some advantages using it as biodiesel resource are continuity resources (renewable) and ecofriendly energy.

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**Figure 1.** *Jatropha curcas* L.

The oil can be converted to biodiesel through transesterification easily [1]. Utilization is associated with the biomass that is left behind after the oil extraction. Large number of waste impacts the environment. In this chapter, we present several ways of processing the waste to make it a valuable product.
