Acidogenic fermentation of cassava wastewater for volatile fatty acids production

Niz, Mirian Yasmine Krauspenhar; Formagini, Edinéia Lazarotto; Boncz, Marc Árpád; Paulo, Paula Loureiro

doi:10.1504/ijewm.2020.105353

Cited by 4 publications

(14 citation statements)

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“…Studies about the acidification of SCGs are still scarce, and these values can mainly be compared with other wastes already tested. Similar values of AD were found for waste sludge, such as 21% [ 68 ]; for cassava wastewater, 36% [ 69 ]; or for palm oil mill effluent, 25% [ 70 ]. Higher ADs were generally reported for substrates with higher biodegradability and a lower presence of inhibitors, such as potato solid waste (69%) [ 71 ], cheese whey (67%) [ 72 ], food waste (47%) [ 73 ], or sugarcane molasses (42%) [ 74 ].…”

Section: Resultssupporting

confidence: 66%

Impact of a Pretreatment Step on the Acidogenic Fermentation of Spent Coffee Grounds

et al. 2022

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Acidogenic fermentation (AF) is often applied to wastes to produce short-chain organic acids (SCOAs)—molecules with applications in many industries. Spent coffee grounds (SCGs) are a residue from the coffee industry that is rich in carbohydrates, having the potential to be valorized by this process. However, given the recalcitrant nature of this waste, the addition of a pretreatment step can significantly improve AF. In this work, several pretreatment strategies were applied to SCGs (acidic hydrolysis, basic hydrolysis, hydrothermal, microwave, ultrasounds, and supercritical CO2 extraction), evaluated in terms of sugar and inhibitors release, and used in AF. Despite the low yields of sugar extracted, almost all pretreatments increased SCOAs production. Milder extraction conditions also resulted in lower concentrations of inhibitory compounds and, consequently, in a higher concentration of SCOAs. The best results were obtained with acidic hydrolysis of 5%, leading to a production of 1.33 gSCOAs/L, an increase of 185% compared with untreated SCGs.

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Section: Resultssupporting

confidence: 66%

Impact of a Pretreatment Step on the Acidogenic Fermentation of Spent Coffee Grounds

et al. 2022

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“…In recent years, there has been increasing research interest in the recovery of VFA from solid waste [37] and wastewater [38,39]. Research has aimed to evaluate and optimize operational parameters such as pH, temperature, organic loading rate, substrate concentration, hydraulic retention time and inoculum [7,38,40,41], through laboratory-scale experiments in continuous [38,42] and batch [43] reactors.…”

Section: Bibliometric Network Of Vfa and Wastewater Fermentation Studiesmentioning

confidence: 99%

“…Wastewater (real and synthetic) derived from agricultural or food sources, or more complex effluents such as municipal or industrial wastewater, have been used for VFA production through AF in laboratory and pilot scale experiments. Some examples include dairy wastewater [48][49][50][51], cheese whey [38,52], slaughterhouse wastewater [37], paper mill wastewater [37,38], winery wastewater [37], olive oil mill wastewater [53], saline cooked mussel processing wastewater [54], synthetic soft drink wastewater [55], wood mill wastewater [56], swine wastewater [28,57,58], sucrose-rich wastewater [59,60], municipal wastewater [61] and cassava processing wastewater [39,40].…”

Section: Operational Parameters Of Vfa Production By Wastewater Ferme...mentioning

confidence: 99%

“…An increase in the degree of hydrolysis is reflected in a higher concentration of total VFA. Niz et al [39], who used wastewater from cassava processing, concluded that neither sludge adaptation nor heat treatment to eliminate methanogenic archaea activity was as relevant as pH in improving VFA production.…”

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confidence: 99%

“…Consistently, when HRT was reduced to 4 h, the VFA concentration decreased abruptly and achieved the minimum of 1892.90 mg HAc/L. Most studies on AF of wastewater were conducted in batch bioreactors [7,39,40]. Therefore, there is limited information in the scientific literature evaluating the effect of HRT on the production of carboxylic acids, mainly if wastewater from cassava processing is treated.…”

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confidence: 99%

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Volatile Fatty Acids Production by Acidogenic Fermentation of Wastewater: A Bibliometric Analysis

2023

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This study presents a bibliometric analysis of the scientific literature on volatile fatty acids (VFA) production from wastewater fermentation published from 1981 to 21 June 2021. A total of 618 papers obtained from the Scopus database were analyzed using VOSviewer 1.6.16 software. According to the results, this topic has been capturing the attention of researchers over the years, but with different research approaches, including optimization of anaerobic digestion in two-stage reactors, biological removal of nutrients from wastewater, energy production in bioelectrochemical systems, and recovery of VFA as value-added intermediate products to be used as inputs in a variety of industries. In addition, the bibliometric networks obtained from the authors’ keyword frequency showed that wastewater treatment by using fermentation to obtain VFA as a value-added by-product is an emerging topic that undoubtedly requires further research and collaboration between scientific institutions. In this regard, different types of wastewater have been used as a substrate for acidogenic fermentation; however, and based on the results, the production of VFA from cassava processing wastewater is seen as one of the emerging issues of this field. Finally, evaluating the effect of operating conditions on the fermentation process, such as pH, hydraulic retention time, organic loading rate, temperature, inoculum and substrate concentration, independent of the final application of the VFA produced, is a relevant aspect for bioprocess optimization and implementation on a large scale.

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A review on the use and applications of Volatile Fatty Acids on fecal sludge sanitization

Zewde

Zhou

2023

Journal of Water, Sanitation and Hygiene for Development

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Basic sanitation is still lacking in many developing countries, resulting in significant environmental health risks. The efficient disposal of food waste with potential resource recovery has recently gained much attention. Food waste is considered to be a favourable substrate for the anaerobic digestion (AD) because it has easy biodegradability, rich nutrient availability, and high water content. Waste disposal as well as energy recovery can be achieved through AD of food waste. Volatile fatty acids (VFAs) are among the essential intermediates produced when organic waste is treated in the AD process. They are produced during the acidogenesis and acetogenesis stages of AD. VFA is an important substrate for the microorganisms that are involved in the production of biodegradable plastics, bioenergy, nutrient removal processes, and the inactivation of pathogens. Since the degree of acidification and the key metabolic pathways during fermentation are influenced by the characteristics of the substrate, the amount and composition of VFAs obtained during the AD process may vary depending on the substrate used. This article reviews the achievements and applications of VFAs to inactivate pathogens.

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Acidogenic fermentation of cassava wastewater for volatile fatty acids production

Cited by 4 publications

References 0 publications

Impact of a Pretreatment Step on the Acidogenic Fermentation of Spent Coffee Grounds

Impact of a Pretreatment Step on the Acidogenic Fermentation of Spent Coffee Grounds

Volatile Fatty Acids Production by Acidogenic Fermentation of Wastewater: A Bibliometric Analysis

A review on the use and applications of Volatile Fatty Acids on fecal sludge sanitization

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