Abstract
In the present study, valorization of food and lignocellulosic wastes into biodiesel and 2-phenylethanol using Metchinikowia pulcherrima isolated 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 of M. 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 of M. pulcherrima cultivation on FWH enriched with WWA for efficient biofuel production through waste recycling.
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