Anaerobic treatment of biodiesel by-products in a pilot scale reactor

Kolesárová, Nina; Hutňan, Miroslav; Špalková, Viera; Kuffa, R.; Bodı́k, Igor

doi:10.2478/s11696-011-0035-0

Cited by 11 publications

(12 citation statements)

References 13 publications

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“…As a result of feeding the g-phase into the laboratory reactor, DIS gradually accumulated in the sludge and their concentration attained about 22 g L −1 . No apparent inhibitory effects were observed, probably due to successful adaptation of the biomass, as supported by prior experience (Kolesárová et al, 2011a(Kolesárová et al, , 2011b although, in the event of any further accumulation of salts, it would be crucial to dilute this substrate with water.…”

Section: Co-fermentation In Laboratory Reactorsupporting

confidence: 53%

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Anaerobic treatment of rapeseed meal

et al. 2013

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Rapeseed meal is a solid by-product obtained from rapeseed after oil extraction. This contribution summarises experiences from batch experiments as well as the long-term processing of this substrate in a laboratory stirred anaerobic reactor (continuous stirred-tank reactor). On the basis of the batch tests of hydrolysis, acidogenesis, and methanogenic activity, it was concluded that the anaerobic degradation of rapeseed meal can be performed using a one-step system and it is not necessary to include a hydrolytic-acidogenic step prior to the methanogenic step. Although the methanogenic potential of rapeseed meal appears to be very promising, the long-term processing as a single substrate led to serious problems arising from the inhibitory effects. It was, therefore, co-fermented with crude glycerol from biodiesel production. From the long-term operation of the laboratory model, it may be stated that, due to the co-fermentation of by-products from biodiesel production, the individual inhibition effects can be suppressed to a large extent and biogas production can be stabilised. The maximum organic loading rate in the continuous stirred reactor achieved 2.42 kg m −3 d −1 of volatile solids (15 g of rapeseed meal and 20 mL of gas-phase), which was 3.13 kg m −3 d −1 of chemical oxygen demand.

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Section: Co-fermentation In Laboratory Reactorsupporting

confidence: 53%

“…Crude glycerol was also successfully co-fermented with rapeseed meal in a pilot reactor for a period of 136 days (Kolesárová et al, 2011a). The maximum organic loading rate (OLR) of 1.33 kg m −3 d −1 (500 mL of g-phase and 500 g of rapeseed meal) was achieved.…”

Section: Introductionmentioning

confidence: 96%

Anaerobic treatment of rapeseed meal

et al. 2013

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“…A number of papers are focused on the crude glycerol co‐treatment with other wastes. According to Kolesarova et al . crude glycerol digestion in a CSTR, with recirculation, provided stable biogas production of 760 L per L of crude glycerol.…”

Section: Discussionmentioning

confidence: 99%

“…Methane may be used as a fuel in internal combustion engines. In addition to the methane generation, other significant advantages of anaerobic digestion are the low sludge production and the waste stabilization …”

Section: Introductionmentioning

confidence: 99%

“…In addition to the methane generation, other significant advantages of anaerobic digestion are the low sludge production and the waste stabilization. 24 A few studies have focused on biogas production from glycerol, 25 particularly the glycerol generated during biodiesel production. 26 Crude glycerol has also been added as a supplement in co-digestion with other wastes (such as municipal solid wastes, agro-industrial by-products and cattle slurry) to enhance methane production.…”

Section: Introductionmentioning

confidence: 99%

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Methane production via anaerobic digestion of glycerol: a comparison of conventional (CSTR) and high‐rate (PABR) digesters

Vlassis

Stamatelatou

Αντωνοπούλου

et al. 2013

J of Chemical Tech & Biotech

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BACKGROUND Biodiesel is an alternative to fossil fuels and can be used directly in internal combustion engines when mixed with diesel. The economic feasibility of biodiesel production necessitates the valorisation of glycerol, which is produced in large quantities (equal to 10% of the biodiesel produced). Anaerobic digestion is applicable to a variety of organic residues yielding biogas rich in methane. In order to estimate the net potential of glycerol to yield methane, pure glycerol was selected to avoid any effect from the impurities in crude glycerol. RESULTS The anaerobic digestion of pure glycerol was studied in two types of bioreactors: a continuous stirred tank reactor (CSTR) and a baffled reactor (periodic anaerobic baffled reactor, PABR). Both reactors were operated in mesophilic conditions (35 °C) at various organic loading rates. The maximum glycerol loading achieved in a CSTR was 0.25 g COD L–1 d–1, yielding 0.074 ± 0.009 L CH4 L–1 d–1. On the other hand, PABR allowed glycerol degradation at a loading of 3 g COD L–1 d–1 yielding 0.993 ± 0.102 L CH4 L–1 d–1. CONCLUSION PABR was proved to be more efficient since it was subjected to a 10‐fold higher organic loading rate than CSTR. Moreover, its performance was much higher in terms of COD removal and methane productivity. © 2013 Society of Chemical Industry

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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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Anaerobic treatment of biodiesel by-products in a pilot scale reactor

Cited by 11 publications

References 13 publications

Anaerobic treatment of rapeseed meal

Anaerobic treatment of rapeseed meal

Methane production via anaerobic digestion of glycerol: a comparison of conventional (CSTR) and high‐rate (PABR) digesters

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

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