Semi-continuous anaerobic digestion of solid slaughterhouse waste

Escudero, Ania; Lacalle, Arrate; Blanco, F.; Pinto, M.; Díaz, Ignacio; Domı́nguez, A.

doi:10.1016/j.jece.2014.02.006

Cited by 28 publications

(11 citation statements)

References 41 publications

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“…The slaughterhouses are important sources of waste generation, especially wastewater [1]- [3]. Various stages are involved during the slaughtering of animals, viz.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Treatment of Slaughterhouse Wastewater: Evaluating Operating Conditions

Chollom

Rathilal

Swalaha

et al. 2019

WIT Transactions on Ecology and the Environment

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The aim of the study was to elucidate the effect of process parameters on the performance of an upflow anaerobic sludge blanket reactor (UASB) that was treating slaughterhouse wastewater. The UASB reactor was operated continuously under mesophilic conditions to evaluate its performance with respect to the removal of organics and, at the same time, monitor biogas production. Organic loading rate (OLR) was varied while keeping the hydraulic retention time (HRT) constant. Chemical oxygen demand (COD) removal efficiency higher than 75% was achieved at an OLR of 9 kg.COD.m-3.d-1, with a HRT of 12 h. Bulking sludge problems were not observed during the reactor operation period. Stability of the treatment process was achieved by the natural buffering of the system due to the produced alkalinity and also due to the characteristics of the wastewaters which was found to be rich in proteins and fatty acids.

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“…The slaughterhouses are important sources of waste generation, especially wastewater [1]- [3]. Various stages are involved during the slaughtering of animals, viz.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Treatment of Slaughterhouse Wastewater: Evaluating Operating Conditions

Chollom

Rathilal

Swalaha

et al. 2019

WIT Transactions on Ecology and the Environment

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“…7 However, many problems such as the low pH and nitrogen content and the presence of inhibiting substances including phenolic compounds, must be overcome to ensure good efficiency in terms of pollution reduction and energy production yields. 14 In other studies, 15,16 authors also linked the performance of the anaerobic reactor with the feeding frequency and reported that the biochemical methane (CH 4 ) production is better when using a semi-continuous configuration as compared to the continuous one. [9][10][11] In these studies, authors reported that the immobilization of the biomass on porous carriers increases the bioavailability of pollutants and intensifies the bioremediation potential of biomass, which enhances significantly the tolerance toward microbial inhibitors and increases the reactor efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…The use of downflow attached growth processes allows for higher void space packing material, no plugging problems and ease in operation. 14 In other studies, 15,16 authors also linked the performance of the anaerobic reactor with the feeding frequency and reported that the biochemical methane (CH 4 ) production is better when using a semi-continuous configuration as compared to the continuous one.…”

Section: Introductionmentioning

confidence: 99%

Performance and microbial analysis during long‐term anaerobic digestion of olive mill wastewater in a packed‐bed biofilm reactor

Enaime

Nettmann

Berzio

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: The treatment of olive mill wastewater (OMWW) in a packed bed biofilm reactor (PBBR) and the identification of different microorganisms involved in the digestion process is an attractive field for research. RESULTS: A PBBR treating OMWW under different organic loading rates (OLRs) (0.94-9.36 gCOD/(L d)), showed high stability during an extensive time (723 days) without any sign of acidification. High volumetric biogas and methane (CH 4 ) productions, 4.1 and 2.4 L N /(L reactor d), respectively were registered at the highest OLR. Meanwhile, high chemical oxygen demand (COD) removal (62.5-79.7%) was obtained throughout the experiment. Phenolic compounds removal was much higher during the first steps of the experiment (75.9-84.2%), and decreased as the OLR increased to about 38%. High homogeneity of biofilm thickness and Bacteria and extracellular polymeric substance distribution were demonstrated by confocal laser scanning microscopy. Results of real-time quantitative polymerase chain reaction (PCR) and 16S rRNA amplicon analyses showed that Bacteria, mainly consisting of Firmicutes, Proteobacteria, Bacteroidetes andChloroflexi phylum, was about eight times more abundant than Archaea in the reactor liquid phase, while Bacteria to Archaea ratio was almost one in the biofilm. This points to a major degradation of organic substances in the liquid, while methanogenesis occurred mainly within the biofilm. In the liquid, acetoclastic methanogens were more abundant than hydrogenotrophic ones, while both groups showed likely very similar contributions in the biofilm.CONCLUSION: Promising results have been presented throughout this work providing information about the long-term operation of PBBR-granular activated carbon treating OMWW and analyzing, in an efficient manner, the structure and the composition of the microbial community involved in OMWW digestion.

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“…Other studies have evaluated continuous against semi-continuous mesophilic anaerobic digestion under varying organic loading rates. These studies concluded that biochemical methane production was slightly better in the semi-continuous systems, and also increased in both types as the organic loading rate increased up to 6 kg/m 3 /-day, after which methanogenesis inhibition was likely due to volatile fatty acid accumulation that occurred (Escudero et al, 2014;Li et al, 2014b). Wang et al (2014) presented a feeding strategy that alternated the substrate composition (i.e.…”

Section: Introductionmentioning

confidence: 99%

Semi-continuous mesophilic anaerobic digester performance under variations in solids retention time and feeding frequency

Manser

Mihelcic

Ergas

2015

Bioresource Technology

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The goal of this research was to understand the effect of solids retention time (SRT) and feeding frequency on the performance of anaerobic digesters used to recover bioenergy from swine waste. Semi-continuous mesophilic anaerobic digesters were operated at varying SRTs and feeding frequencies. Performance metrics included biogas and methane production rates, biomass robustness and functionality and removals of volatile solids, soluble chemical oxygen demand, the fecal-indicator bacteria Escherichia coli, and the human pathogen Salmonella. Biochemical methane formation potential and specific methanogenic activity assays were used to demonstrate biomass robustness and functionality. Results indicated that anaerobic digesters fed weekly had higher average methane yields (0.20 vs. 0.18m(3)CH4/kg-VSadded), specific methanogenic activities (40 vs. 35ml/day), and fecal indicator bacteria destruction (99.9% vs. 99.4%) than those fed every-other day. Salmonella, soluble COD, and VS destruction did not change with varied feeding frequency; however, higher removals were observed with longer SRT.

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Semi-continuous anaerobic digestion of solid slaughterhouse waste

Cited by 28 publications

References 41 publications

Anaerobic Treatment of Slaughterhouse Wastewater: Evaluating Operating Conditions

Anaerobic Treatment of Slaughterhouse Wastewater: Evaluating Operating Conditions

Performance and microbial analysis during long‐term anaerobic digestion of olive mill wastewater in a packed‐bed biofilm reactor

Semi-continuous mesophilic anaerobic digester performance under variations in solids retention time and feeding frequency

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