biodiesel 4 engine performance History of engineering & technology 2 Technology: general issues 2 activated carbon 2 adsorption 2 anaerobic digestion 2 biogas production 2 developing countries 2 esterification 2 response surface methodology 2 sustainability 2 transesterification 2 viscosity 2 wastewater 2 100% Renewable grid 1 <i>Rhodotorula glutinis</i> 1 ASEAN 1 Annona muricata 1 Bangladesh 1 CHO index 1 CIE standard 1 CO2 1 CO2 absorption 1 CO2 adsorption 1 COVID-19 1 Calophyllum inophyllum biodiesel 1 Cape gooseberry 1 Carica papaya 1 Chlorella 1