Co-fermentation of municipal waste streams: Effects of pretreatment methods on volatile fatty acids production

Owusu-Agyeman, Isaac; Balachandran, Srija; Płaza, Elżbieta; Çetecioğlu, Zeynep

doi:10.1016/j.biombioe.2020.105950

Cited by 21 publications

(5 citation statements)

References 46 publications

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“…Bahreini et al [73] reported the use of Novozym 50199 to pretreat (10 min) primary sludge and enhance the maximum VFA concentration by 56% in a fed-batch digester. Similar results with a VFA increase of up to 39% were reported by Owusu-Agyeman et al [74], who used an enzyme cocktail of α-amylase, lipase, cellulase, dextranase and protease to pre-treat primary sludge.…”

Section: Substrate Pre-treatment To Enhance Biohydrogen Productionsupporting

confidence: 87%

Intensification of Acidogenic Fermentation for the Production of Biohydrogen and Volatile Fatty Acids—A Perspective

et al. 2022

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Utilising ‘wastes’ as ‘resources’ is key to a circular economy. While there are multiple routes to waste valorisation, anaerobic digestion (AD)—a biochemical means to breakdown organic wastes in the absence of oxygen—is favoured due to its capacity to handle a variety of feedstocks. Traditional AD focuses on the production of biogas and fertiliser as products; however, such low-value products combined with longer residence times and slow kinetics have paved the way to explore alternative product platforms. The intermediate steps in conventional AD—acidogenesis and acetogenesis—have the capability to produce biohydrogen and volatile fatty acids (VFA) which are gaining increased attention due to the higher energy density (than biogas) and higher market value, respectively. This review hence focusses specifically on the production of biohydrogen and VFAs from organic wastes. With the revived interest in these products, a critical analysis of recent literature is needed to establish the current status. Therefore, intensification strategies in this area involving three main streams: substrate pre-treatment, digestion parameters and product recovery are discussed in detail based on literature reported in the last decade. The techno-economic aspects and future pointers are clearly highlighted to drive research forward in relevant areas.

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Section: Substrate Pre-treatment To Enhance Biohydrogen Productionsupporting

confidence: 87%

Intensification of Acidogenic Fermentation for the Production of Biohydrogen and Volatile Fatty Acids—A Perspective

et al. 2022

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“…This improves the solubilization of organic waste, and the increased bacterial activity results in the release of hydrolytic enzymes. This significantly increased biogas production by doubling or tripling it ( Pilli et al., 2020 ; Owusu-Agyeman et al., 2021 ).…”

Section: Resultsmentioning

confidence: 99%

Bio methane potential of sludge from municipal sewer and exchange stations

Selamawit

Agizew

2022

Heliyon

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Technologies with resource recovery alternatives are suggested in metropolitan settings. Anaerobic digesters (AD) are the most common. The use of microcrystalline cellulose and a variety of grocery products as control feed increases the cost of bio methane potential analysis (BMP). This limits its replication, especially in developing countries. As a result, this study looks into the use of milled paper as a control feed during BMP analysis of sludge from sewer and exchange stations. A batch experimental study at 37 °C with hydraulic retention times of 23 and 24 days for exchange station and sewage sludge, respectively, was established for the assessment. The pH of the sewage sludge was acidic during the analysis. To avoid underestimating the total (TS) and volatile solid (VS) ratios, the VS should indeed be determined through temperature or pH adjustment. As a result, the preceding alternative was implemented in this work. According to the findings of the online biogas application, the blank (milled paper) accurately keeps the required validation standards. Furthermore, the gas production potential of sludge from the exchange station (ES) and the sewage line (SS) is 2.4 and 1.6 NL/gVs, respectively. The generated gas has an electric potential of 8.81 and 3.35 KWH for ESS and SS, respectively. Interestingly, the calorific values of the investigated substrates were also nearly equivalent. In brief, using milled paper as a control feed in BMP analysis reduces laboratory costs and encourages BMP test repetition, which is especially important in developing countries. This advances research on the use of AD in the search for alternative energy sources.

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“…It has been well demonstrated that the biowaste fermentation products profiles depended on the substrate composition, process design, reactor types, and operational parameters [ 13 , 14 ]. For example, organic loading rates were found to be positively related to total VFA concentrations during the fermentation of organic fraction of municipal solid waste [ 15 ] and fruit waste [ 16 ], achieving the highest VFA conversion yield at 14 g‐VS/(L.day). Besides organic loading rate, pH control was also proved as one of the most common methods influencing VFAs production.…”

Section: Introductionmentioning

confidence: 99%

“…The hypothesis was proved in many studies by identifying the significant correlation between microbial community composition (DNA‐based) and fermentation performance (yields and profiles) [ 13 , 25 ]. For example, with 16S rRNA gene amplicon sequencing, Lactobacillus , Clostridium_sensu_stricto_12 , and Caproiciproducens has been proved to be closely related to anaerobic VFA production [ 16 ], due to the significant correlation between their relative abundance and VFA concentration. In another study , Bacillaceae, Proteinivoracales_uncultured and Dysgonomonadaceae were identified as the most important VFA producers based on their high relative abundance (34%, 16%, and 52.18%, respectively) in alkalic biowaste fermentation systems [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Microbiome dynamics and products profiles of biowaste fermentation under different organic loads and additives

Zhu,

Li,

2023

Engineering in Life Sciences

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Biowaste fermentation is a promising technology for low‐carbon print bioenergy and biochemical production. Although it is believed that the microbiome determines both the fermentation efficiency and the product profiles of biowastes, the explicit mechanisms of how microbial activity controls fermentation processes remained to be unexplored. The current study investigated the microbiome dynamics and fermentation product profiles of biowaste fermentation under different organic loads (5, 20, and 40 g‐VS/L) and with additives that potentially modulate the fermentation process via methanogenesis inhibition (2‐bromoethanesulfonate) or electron transfer promotion (i.e., reduced iron, magnetite iron, and activated carbon). The overall fermentation products yields were 440, 373 and 208 CH4‐eq/g‐VS for low‐, medium‐ and high‐load fermentation. For low‐ and medium‐load fermentation, volatile fatty acids (VFAs) were first accumulated and were gradually converted to methane. For high‐load fermentation, VFAs were the main fermentation products during the entire fermentation period, accounting for 62% of all products. 16S rRNA‐based analyses showed that both 2‐bromoethanesulfonate addition and increase of organic loads inhibited the activity of methanogens and promoted the activity of distinct VFA‐producing bacterial microbiomes. Moreover, the addition of activated carbon promoted the activity of H2‐producing Bacteroides, homoacetogenic Eubacteriaceae and methanogenic Methanosarcinaceae, whose activity dynamics during the fermentation led to changes in acetate and methane production. The current results unveiled mechanisms of microbiome activity dynamics shaping the biowaste fermentation product profiles and provided the fundamental basis for the development of microbiome‐guided engineering approaches to modulate biowaste fermentation toward high‐value product recovery.

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Co-fermentation of municipal waste streams: Effects of pretreatment methods on volatile fatty acids production

Cited by 21 publications

References 46 publications

Intensification of Acidogenic Fermentation for the Production of Biohydrogen and Volatile Fatty Acids—A Perspective

Intensification of Acidogenic Fermentation for the Production of Biohydrogen and Volatile Fatty Acids—A Perspective

Bio methane potential of sludge from municipal sewer and exchange stations

Microbiome dynamics and products profiles of biowaste fermentation under different organic loads and additives

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