International Journal of Energy Research, Vol.45, No.2, 3430-3441, 2021
A sustainable approach for bioconversion of food and lignocellulosic wastes into liquid biofuel using a newMetschnikowia pulcherrimaisolate
In the present study, valorization of food and lignocellulosic wastes into biodiesel and 2-phenylethanol usingMetchinikowia pulcherrimaisolated from rotten food wastes was evaluated. At the optimum pH of 5.5, food waste hydrolysate (FWH) showed 74.1% higher dry weight than the corresponding synthetic medium. Rice straw (RS) and softwood sawdust (WWA) were used as additional carbon sources to increase the C:N ratio of FWH. WWA enhanced the biomass production by 23.3% and 55.9% over the corresponding RS and FWH, respectively; while RS enhanced lipid accumulation. Due to enhancement of growth, 75 g WWA showed the maximum recorded lipid productivity of 2.49 g L(-1)d(-1). Interestingly, both hexoses and pentoses were effectively metabolized. Regarding fatty acid profile ofM. pulcherrima, RS- and WWA-enriched growth media showed higher saturated fatty acids proportions (56.9% and 98.3%, respectively, over that of FWH), with better biodiesel characteristics. FWH showed the heights significant production of 2-phenylethanol up to 56.7 mg L(-1)after 96 hours. However, FWH enriched with WWA showed the highest gross energy output of 33.98 GJ m(-3)y(-1). Thus, the present study suggested an integrated approach ofM. pulcherrimacultivation on FWH enriched with WWA for efficient biofuel production through waste recycling.