Experimental investigation on compression ignition engine fuelled with biodiesel from pig tallow oil bioethanol from waste potatoes and commercial diesel

Abstract

The ever increasing energy demand is met primarily (and#8776;88%) by fossil fuels. However, this energy demand is likely to intensify 26% over the next 20 years due to the rapid growth of industries, automobiles and world population. Hence, there is an alarming concern about future vast energy demands with limited and non-renewable resources. Hence this study reports bioethanol from waste potato mash (WPM), biodiesel from pig tallow oil (PTO) and engine performance analysis using their blended fuels. newlineThe raw potatoes (Solanum duperosum L) waste of the food processing industry was taken as precursor for bioethanol production. Waste potato mash (WPM) was previously treated with ultrasonication and hydrolyzed using hydrochloric acid (US-HCl) in acid treatment or and#945;-amylase in enzymatic treatment (US-enzyme). Parameters such as Saccharomyces cerevisiae (S. cerevisiae) concentration (10-20 g/L), enzyme concentration (10-30 U/mL), HCl concentration (1-3% V/V) and ultra-sonication time (5-15) min) were modelled using Box-Behnken Design and optimal values were assessed using the genetic algorithm. The optimal yield for US-HCl hydrolysis was 65.8 mg/L at 2.1% HCl concentration, ultrasonic time 10.7 min. The optimal yield for US-enzyme hydrolysis was 54.1g/L at and#945;-amylase concentration 25.3 U/mL, ultrasonic time 10.2 min, and S. cerevisiae concentration 19.2 g/L. From the results US-HCL process was found to be better than US-enzyme process for bioethanol production from WPM. newline newline