Conclusions
Road transport has been identified as a key sector in greenhouse gases emissions in Singapore, an urban city. Biodiesel generated from RCO (recycled cooking oil) has shown promising performance comparable to fossil diesel. In addition, advantages such as cleanere missions are desirable for sustainable road transport development in any city. As for the production process, transesterification reactions are commonly employed to generate biodiesel from RCO,accompanied by pre-treatment, separation and purification steps to produce good quality biodiesel.