Bio-augmentation to improve lactic acid production from source-sorted organic household waste

نویسندگان

چکیده

Abstract The high and easy degradable sugar content of source-sorted organic household (SSOHW) suggests it as a promising candidate for fermentative lactic acid production. present study aimed to apply bio-augmentation strategy with different bacteria (Lactobacillus delbrueckii or Pediococcus acidilactici) improve production from non-sterile SSOHW. optimum operational temperature, initial pH total solid loading during fermentation were essential Lactic concentration 20.7 ± 0.3 16.8 ± 0.4 g/L obtained by bio-augmenting acidilactici Lactobacillus delbrueckii, respectively, achieving an increment 36.2% 10.5% compared abiotic augmentation. A yield 0.73 g/g-sugar was achieved addition acidilactici, while the optical purity LA also improved bio-augmentation. Furthermore, response surface methodology along Box-Behnken model applied determine optimal conditions (i.e. loading). Based on outcome, highest 31.2 g/L 0.735 g/g-sugar at temperature 32.4 °C, 8.0 105.0 g/L. Finally, predicted value validated scale-up experiment, titer fermenter well corresponding value. process optimization provided simple energy saving method industrial SSHOW. With respect environmental sustainability cleaner production, conversion bio-waste is advantageous waste management approach that will contribute transition petro-based economy towards use bio-based derived products thereby creating innovative chains lower carbon footprint social responsibility.

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