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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of initial pH and substrate concentration on the lactic acid production from cassava wastewater fermentation by an enriched culture of acidogenic microorganisms

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da Silva, Douglas B. [1] ; Fernandes, Bruna S. [2] ; da Silva, Ariovaldo J. [1]
Total Authors: 3
[1] Univ Estadual Campinas, Sch Agr Engn, Campinas, SP - Brazil
[2] Univ Fed Pernambuco, Recife, PE - Brazil
Total Affiliations: 2
Document type: Journal article
Source: WATER ENVIRONMENT RESEARCH; v. 93, n. 10, p. 1925-1933, OCT 2021.
Web of Science Citations: 0

Recently, cassava processing wastewater has been considered an alternative substrate for lactic acid production due to its appreciable carbohydrate levels. The authors carried out different batch reactor trials aiming to favor the production of lactic acid through the fermentation of non-sterilized cassava wastewater by an enriched culture of acidogenic microorganisms. To this end, the impact of different initial pHs (4.5, 5.0, 5.7, 6.5, and 7.0) and different initial substrate concentrations (10, 15.8, 30, 44.2, and 50 g/L) in terms of glucose on lactic acid production yield (Y) was evaluated by applying the design of experiment (DoE) known as central composite rotatable design (CCRD). The highest rate of lactic acid production (40 g/L) occurred with an initial pH of 6.5 and an initial substrate concentration of 50 g/L. The maximum yield was higher in trials T1, T2, T4, T5, and T8, reaching values of 0.80, 0.62, 0.60, 0.96, and 0.70 g/g, respectively. The maximum lactic acid productivity (P), of 0.60 and 0.73 g L-1 hr(-1), was observed in trials T5 and T8, respectively. The enriched culture of acidogenic microorganisms was shown to favor the production of lactic acid, since the production of other acids, such as acetic and propionic acid, did not exceed 3.5 and 4.5 g/L, respectively. Practitioner points Cassava wastewater presented potential to lactic acid production. The CCRD showed that highest lactic acid concentrations (40 g/L). The adoption of cassava wastewater or manipueira as a substrate resulted in important information on the tendency to obtain value-added products such as lactic acid. (AU)

FAPESP's process: 12/09785-8 - Anaerobic wastewater digestion directed to butanol and ethanol production
Grantee:Ariovaldo José da Silva
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants