Microbial production of lactic acid from food waste: Latest advances, limits, and perspectives

Song, Liang; Yang, Dongyuan; Liu, Rui; Liu, Shiyu; Dai, Lingling; Dai, Xiaohu

doi:10.1016/j.biortech.2021.126052

Cited by 56 publications

(25 citation statements)

References 137 publications

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“…7 c). There are many studies on LA production using various biomass such as food waste [ 57 ], bakery waste [ 58 ], rice straw, and cassava bagasse [ 59 ], but there are no studies using textile wastes yet. This finding demonstrates that cotton-based textile waste may also be used for LA production, and enhance the economic feasibility of modern biorefineries.…”

Section: Resultsmentioning

confidence: 99%

Converting textile waste into value-added chemicals: An integrated bio-refinery process

Cho

Lee

Song

et al. 2023

Environmental Science and Ecotechnology

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Section: Resultsmentioning

confidence: 99%

Converting textile waste into value-added chemicals: An integrated bio-refinery process

Cho

Lee

Song

et al. 2023

Environmental Science and Ecotechnology

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“…The principal pathway to mitigate inherent economic drawbacks will be to develop more cost-effective processes for converting biomass to monomer precursors. This can be achieved by using a waste biomass source as the monomer feedstock, such as in PLA which can be generated from food waste [122], or through advances in catalysis to achieve higher reaction yields and better product selectivity while requiring a lower energy input (figure 13) [123]. Sustainability should also be designed into this framework by adopting green chemistry concepts and principles where possible [118].…”

Section: Advances In Science and Technology To Meet Challengesmentioning

confidence: 99%

The sustainable materials roadmap

et al. 2022

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Our ability to produce and transform engineered materials over the past 150 years is responsible for our high standards of living today, especially in the developed economies. Yet, we must carefully think of the effects our addiction to creating and using materials at this fast rate will have on the future generations. The way we currently make and use materials detrimentally affects the planet Earth, creating many severe environmental problems. It affects the next generations by putting in danger the future of economy, energy, and climate. We are at the point where something must drastically change, and it must change NOW. We must create more sustainable materials alternatives using natural raw materials and inspiration from Nature while making sure not to deplete important resources, i.e. in competition with the food chain supply. We must use less materials, eliminate the use of toxic materials and create a circular materials economy where reuse and recycle are priorities. We must develop sustainable methods for materials recycling and encourage design for disassembly. We must look across the whole materials life cycle from raw resources till end of life and apply thorough life cycle assessments based on reliable and relevant data to quantify sustainability.

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“…The optimal pH for LA production is still a debated question with several studies reporting opposing views. However, it can be noted that the best pH range largely depends on the type of raw substrate, inoculum, and reactor configuration used [30]. Currently, there are very few papers published on LA production at low pH in a semicontinuous/continuous mode using FW as the substrate.…”

Section: La Fermentation In Very Acidic Environmentmentioning

confidence: 99%

“…They found that at pH 3.2, LA was the main product accounting for 32.4% of the sCOD with a concentration of 5.7 g COD/L. However, further pushing the pH to 4.0, they reached additional production of LA, reaching 13.4 g COD/L representing 53.9% of the sCOD [30]. Finally, they showed that for a pH above 4.5, the LA concentration decreased to 0.6 and 0.3 g COD/L at pH 5.00 and 6.00, respectively, with a subsequent improvement in the VFAs generation.…”

Section: La Fermentation In Very Acidic Environmentmentioning

confidence: 99%

Lactic acid fermentation of food waste at acidic conditions in a semicontinuous system: effect of HRT and OLR changes

Pau

Tan

Arriaga

et al. 2022

Biomass Conv. Bioref.

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Lactic acid production through fermentation is an established technology, however, improvements are necessary to reduce the process costs and to decrease its market price. Lactic acid is used in many industrial sectors and its market has increased in the last decade for its use as the raw material for polylactic acid product. Using food waste as a cheap and renewable substrate, as well as fermentation at uncontrolled pH, helps to make the production cheaper and to simplify the downstream purification process. Lactic acid production at acidic conditions and the role of varying organic loading rate (OLR) and hydraulic retention time (HRT) were tested in two different semicontinuous batch fermentation systems. Reactor performances indicated that lactic acid fermentation was still possible at pH < 3.5 and even up to a pH of 2.95. The highest lactic acid production was recorded at 14-day HRT, 2.14 g VS/L·day OLR, and pH 3.11 with a maximum lactic acid concentration of 8.72 g/L and a relative yield of 0.82 g lactate/g carbohydrates. The fermentation microbial community was dominated by Lactobacillus strains, the organism mainly responsible for lactic acid conversion from carbohydrates. This study shows that low pH fermentation is a key parameter to improve lactic acid production from food waste in a semicontinuous system. Acidic pH favored both the selection of Lactobacillus strains and inhibited VFA producers from utilizing lactic acid as primary substrate, thus promoting the accumulation of lactic acid. Finally, production yields tend to decrease with high OLR and low HRT, while lactic acid production rates showed the opposite trend.

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Microbial production of lactic acid from food waste: Latest advances, limits, and perspectives

Cited by 56 publications

References 137 publications

Converting textile waste into value-added chemicals: An integrated bio-refinery process

Converting textile waste into value-added chemicals: An integrated bio-refinery process

The sustainable materials roadmap

Lactic acid fermentation of food waste at acidic conditions in a semicontinuous system: effect of HRT and OLR changes

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