Co-digestion of sewage sludge with crude or pretreated glycerol to increase biogas production

Ferreira, Janaína dos Santos; Volschan, Isaac; Cammarota, Magali Christe

doi:10.1007/s11356-018-2260-3

Cited by 25 publications

(6 citation statements)

References 53 publications

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“…The high methane yield in the latter was due to the use of optimized two-stage anaerobic digestion processes (acidogenic and methanogenic) and chemically pre-treated sewage sludge [39]. Despite the decrease in VS removal, dos Santos Ferreira, et al [40] showed that the optimum crude glycerol addition was 0.5 vol% to achieve 73% enhancement in methane yield. The pilot-scale study by Razaviarani, et al [41] showed that the optimum organic loading rate should be around 1.04 g VS L −1 d −1 , corresponding to 1.1 vol% of glycerol addition to avoid process instability.…”

Section: Crude Glycerolmentioning

confidence: 99%

Anaerobic Co-Digestion of Wastewater Sludge: A Review of Potential Co-Substrates and Operating Factors for Improved Methane Yield

et al. 2020

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Anaerobic digestion has been widely employed in waste treatment for its ability to capture methane gas released as a product during the digestion. Certain wastes, however, cannot be easily digested due to their low nutrient level insufficient for anaerobic digestion, thus co-digestion is a viable option. Numerous studies have shown that using co-substrates in anaerobic digestion systems improve methane yields as positive synergisms are established in the digestion medium, and the supply of missing nutrients are introduced by the co-substrates. Nevertheless, large-scale implementation of co-digestion technology is limited by inherent process limitations and operational concerns. This review summarizes the results from numerous laboratory, pilot, and full-scale anaerobic co-digestion (ACD) studies of wastewater sludge with the co-substrates of organic fraction of municipal solid waste, food waste, crude glycerol, agricultural waste, and fat, oil and grease. The critical factors that influence the ACD operation are also discussed. The ultimate aim of this review is to identify the best potential co-substrate for wastewater sludge anaerobic co-digestion and provide a recommendation for future reference. By adding co-substrates, a gain ranging from 13 to 176% in the methane yield was accomplished compared to the mono-digestions.

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Section: Crude Glycerolmentioning

confidence: 99%

Anaerobic Co-Digestion of Wastewater Sludge: A Review of Potential Co-Substrates and Operating Factors for Improved Methane Yield

et al. 2020

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“…The use of crude glycerol has been proposed to boost biogas production. Successful co-digestion with sewage sludge, manures, and leachates has been reported indicating increments in methane yields that can double this parameter when compared with the control [31,[91][92][93][94]. However, the excessive addition of this co-substrate can cause inhibition, which is associated with long-chain fatty acid levels in the reactor, or the accumulation of propionic acid as an intermediary from the anaerobic degradation [95].…”

Section: Co-digestion Proposed As the Best Way To Take Advantage Of Process Synergiesmentioning

confidence: 99%

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Ellacuriaga

García-Cascallana

Gómez

2021

Fuels

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Anaerobic digestion is traditionally used for treating organic materials. This allows the valorization of biogas and recycling of nutrients thanks to the land application of digestates. However, although this technology offers a multitude of advantages, it is still far from playing a relevant role in the energy market and from having significant participation in decarbonizing the economy. Biogas can be submitted to upgrading processes to reach methane content close to that of natural gas and therefore be compatible with many of its industrial applications. However, the high installation and operating costs of these treatment plants are the main constraints for the application of this technology in many countries. There is an urgent need of increasing reactor productivity, biogas yields, and operating at greater throughput without compromising digestion stability. Working at organic solid contents greater than 20% and enhancing hydrolysis and biogas yields to allow retention times to be around 15 days would lead to a significant decrease in reactor volume and therefore in initial capital investments. Anaerobic digestion should be considered as one of the key components in a new economy model characterized by an increase in the degree of circularity. The present manuscript reviews the digestion process analyzing the main parameters associated with digestion performance. The novelty of this manuscript is based on the link established between operating reactor conditions, optimizing treatment capacity, and reducing operating costs that would lead to unlocking the potential of biogas to promote bioenergy production, sustainable agronomic practices, and the integration of this technology into the energy grid.

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“…The OLRs prior to the drop in efficiency for all treatments were generally higher than the range of OLRs that other researchers have studied for biodiesel byproducts. Most were in the range of 0.5–6.5 g COD L −1 day −1 , 10,12,16,22–24 but Ma et al 13 . demonstrated an OLR of 11.7 g COD L −1 day −1 .…”

Section: Resultsmentioning

confidence: 95%

“…The AD system is either exposed gradually to increasing concentrations of inhibitors or the organic loading rate (OLR) of the substrate is gradually increased. Research on acclimatization in anaerobic co‐digestion was mostly conducted in laboratory conditions, for better control of experimental conditions than in field conditions, using lab‐scale digesters with working volume from 50 10 to 5500 mL 11 . In some reported AD acclimatization experiments of biodiesel waste products, only a single digester was used without replicates 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Effect of acclimatization rate on biogas production from anaerobic digestion of biodiesel waste products

Rackliffe

Mosier

2023

Biofuels Bioprod Bioref

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Digester acclimatization can improve the efficiency of anaerobic digestion (AD), a potentially sustainable process for generating biogas from the biological decomposition of organic byproducts from biodiesel production. This study examined the impact of acclimatization rate on biogas production and conversion efficiency in laboratory digesters using inocula from a wastewater treatment plant digester and from an agro‐industrial waste digester. The results showed that co‐digestion of crude glycerol and biodiesel wastewater at high organic loading rates, up to 6.8 g chemical oxygen demand (COD) L−1 day−1, is possible without the addition of other substrates or pretreatment. Higher organic loading rates were achieved in the digesters using inocula from the agro‐industrial waste digester than in the digesters using the wastewater treatment plant digester, indicating that an inoculum with similar physical characteristics may be most appropriate for the AD of biodiesel waste. Of the two acclimatization rates studied, the slower rate improved the cumulative biogas production for both inocula. Both inocula also exhibited higher maximum daily efficiencies with a slower rate of acclimatization, up to a maximum average daily biogas yield of 621 mL biogas g−1 COD added. This implied that the rate of acclimatization can impact the ability of the digester to adapt efficiently to a new substrate.

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Co-digestion of sewage sludge with crude or pretreated glycerol to increase biogas production

Cited by 25 publications

References 53 publications

Anaerobic Co-Digestion of Wastewater Sludge: A Review of Potential Co-Substrates and Operating Factors for Improved Methane Yield

Anaerobic Co-Digestion of Wastewater Sludge: A Review of Potential Co-Substrates and Operating Factors for Improved Methane Yield

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Effect of acclimatization rate on biogas production from anaerobic digestion of biodiesel waste products

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