Assessing the use of crude glycerol from biodiesel production as an alternative to boost methane generation by anaerobic co-digestion of sewage sludge

Alves, Ingrid Roberta de França Soares; Mahler, Cláudio Fernando; Oliveira, Luciano Basto; Reis, Marcelo de Miranda; Bassin, João Paulo

doi:10.1016/j.biombioe.2020.105831

Cited by 21 publications

(13 citation statements)

References 55 publications

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“…Similar results for SWS mono-digestion ( Table 4 ) were also reported by Alves et al (2020) (138.2 mL CH 4 g −1 VS −1 ), Pan et al (2019) (124.43 mL g −1 VS −1 ), Park et al (2021) (100–175 mL CH 4 g −1 VS −1 ), and Zou et al (2018) (88.1 mL CH 4 g −1 VS −1 ). The sanitation sector, with the use of SWS AD, has the possibility of transforming an environmental liability into an energy asset.…”

Section: Discussionsupporting

confidence: 86%

Analysis of biogas production from sewage sludge combining BMP experimental assays and the ADM1 model

Rocha,

Lazarino,

Oliveira

et al. 2024

PeerJ

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The Anaerobic Digestion Model No. 1 (ADM1) was employed to simulate methane (CH4) production in an anaerobic reactor (AR), and the associated bench-scale biochemical methane potential (BMP) assay, having sewage sludge (SWS) from a municipal wastewater treatment plant (WWTP) as feedstock. The SWS presented the following physical-chemical characteristics: pH (7.4–7.6), alkalinity (2,382 ± 100 mg CaCO3 L−1), tCOD (21,903 ± 1,000 mg L−1), TOC (895 ± 100 mg L−1), TS, TVS, and VSS (2.0%, 1.1%, and 0.8%, respectively). The BMP assay was conducted in six replicates under anaerobic mesophilic conditions (37 ± 0.1°C) for 11 days with a CH4 yield registered of 137.6 ± 6.39 NmL CH4 or 124 ± 6.72 CH4 g−1 VS−1. When the results obtained with the BMP bench-scale reactors were compared to the output generated with computational data by the ADM1 model having as input data the same initial sewage tCOD, similar cumulative CH4 production curves were obtained, indicating the accuracy of the ADM1 model. This approach allowed the characterization of the sludge and estimation of its biogas production potential. The combination of BMP assays, experimental data, and ADM1 model simulations provided a framework for studying anaerobic digestion (AD) processes.

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Section: Discussionsupporting

confidence: 86%

Analysis of biogas production from sewage sludge combining BMP experimental assays and the ADM1 model

Rocha,

Lazarino,

Oliveira

et al. 2024

PeerJ

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“…Diverse low-cost substrates can be used as carbon sources for the growth of microalgae and the synthesis of specific products instead of pure substances. Lignocellulosic biomass is the source of carbohydrates, including galactose and glucose, while alkaline residue from biodiesel production contains glycerol [17,20,21]. Although the molasses provided a similar biomass yield comparable to galactose and acetic acid, it was excluded from further research due to its price and limited regional availability.…”

Section: Utilisation Of Different Carbon Sources and Effect Of Carbon...mentioning

confidence: 99%

“…Chlorella vulgaris is a versatile microorganism capable of growth under phototrophic as well as mixotrophic and heterotrophic conditions using diverse substrates, including monosaccharides (glucose and galactose), disaccharides (lactose, sucrose, and maltose), and various low-cost substrates [1,16]. Crude glycerol is the main by-product of lipid transesterification in biodiesel production, representing approximately 10% of total biodiesel [17]. The increase in biodiesel production dropped its price to less than 100 US dollars (USD) per tonne [18].…”

Section: Introductionmentioning

confidence: 99%

Cultivation of a Novel Strain of Chlorella vulgaris S2 under Phototrophic, Mixotrophic, and Heterotrophic Conditions, and Effects on Biomass Growth and Composition

Grubišić,

Peremin,

Djedović

et al. 2024

Fermentation

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Microalgal biomass is an excellent platform for producing food, feed, nutraceuticals, pharmaceuticals, and biofuels. This study aimed to investigate the effect of the trophic mode of cultivation (phototrophic, heterotrophic, and mixotrophic) on the growth and biomass composition of Chlorella vulgaris S2. The contents of lipids and carbohydrates, as well as the fatty acid composition of total lipids, were studied. The effects of the carbon-to-nitrogen ratio (C:N) and the organic carbon concentration of the growth media under mixotrophic and heterotrophic conditions were also investigated. The C:N ratio of 30 mol mol−1 favoured lipid synthesis, and the C:N ratio of 10 mol mol−1 favoured carbohydrate synthesis. Maximal lipid and biomass productivities (2.238 and 0.458 g L−1 d−1, respectively) were obtained under mixotrophic conditions at the C:N ratio of 50 mol mol−1 and glucose concentration of 50 g L−1. Fed-batch cultivation conducted in a stirrer tank bioreactor under heterotrophic growth conditions increased biomass (2.385 g L−1 d−1, respectively) and lipid (0.339 L−1 d−1) productivities ~50 and ~60 times compared to the fed-batch phototrophic cultivation, respectively. The trophic mode, growth phase, and growth medium composition significantly influenced the fatty acid composition. Under mixotrophic and heterotrophic growth conditions, lipid accumulation is associated with an increase in oleic acid (C18:1) content. Mixotrophically grown biomass of Chlorella vulgaris S2 under optimised conditions is a suitable source of lipids for biodiesel production.

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“…To prevent this, it is commonly suggested to maintain crude glycerol levels below 3% v/v [101]. One of the studies that have analyzed the co-digestion of primary sludge with crude glycerol is that of Alves et al [102] (Table 6). Alves et al [102] noticed a considerable increase in methane production, almost up to 167%, when 3% v/v crude glycerol was introduced into the digester.…”

Section: Treatment Processes and Enhancement Of Primary Sludge Anaero...mentioning

confidence: 99%

Enhancing Methane Yield in Anaerobic Co-Digestion of Primary Sewage Sludge: A Comprehensive Review on Potential Additives and Strategies

Sakaveli,

Petala,

Tsiridis

et al. 2024

Waste

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Traditionally, anaerobic digestion has been applied to mixed sludge, combining primary sludge (PS) with secondary sludge. However, recent research has unveiled the advantages of dedicated PS digestion due to its higher energy content. Anaerobic digestion (AD) of primary sewage sludge can offer a sustainable solution for managing sewage sludge while generating renewable energy. The present study provides a comprehensive examination of the current state of knowledge regarding the anaerobic digestion of PS. Co-digestion of PS with organic substrates, including food waste and agro-industrial residues, emerges as a promising approach to boost biogas production. Additionally, the utilization of additives such as glucose and clay minerals has shown potential in improving methane yield. Critical factors affecting AD, such as pretreatment methods, carbon-to-nitrogen (C/N) ratio, temperature, pH, volatile fatty acids (VFAs) levels, organic loading rates (OLR), inoculum-to-substrate ratio (ISR), and the role of additives, have been meticulously studied. Finally, this review consolidates existing knowledge to advance our understanding of primary sewage sludge anaerobic digestion, fostering more efficient and sustainable practices in sludge management and renewable energy generation.

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Assessing the use of crude glycerol from biodiesel production as an alternative to boost methane generation by anaerobic co-digestion of sewage sludge

Cited by 21 publications

References 55 publications

Analysis of biogas production from sewage sludge combining BMP experimental assays and the ADM1 model

Analysis of biogas production from sewage sludge combining BMP experimental assays and the ADM1 model

Cultivation of a Novel Strain of Chlorella vulgaris S2 under Phototrophic, Mixotrophic, and Heterotrophic Conditions, and Effects on Biomass Growth and Composition

Enhancing Methane Yield in Anaerobic Co-Digestion of Primary Sewage Sludge: A Comprehensive Review on Potential Additives and Strategies

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