Anaerobic digestion of thermal pre-treated emulsified slaughterhouse wastes (TESW): Effect of trace element limitation on process efficiency and sludge metabolic properties

Eftaxias, Alexandros; Diamantis, Vasileios; Aivasidis, A.

doi:10.1016/j.wasman.2018.02.032

Cited by 38 publications

(24 citation statements)

References 31 publications

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“…Moreover, the mixtures were further supplemented with glycerol and cheese whey since these substrates are commonly used in anaerobic digesters treating agricultural and agro-industrial wastes (Table 1). The detailed composition of the emulsified animal fat can be found in Eftaxias et al (2018). The added water was used to adjust the COD concentration and the water content of the mixture to the desired levels (see Table 1).…”

Section: Methodsmentioning

confidence: 99%

“…The HRT and the OLR were calculated on the basis of the raw waste flowrate and COD concentration, without taking into consideration the biomass recirculation flow. The PFR was inoculated with anaerobic biomass from a digester treating animal by-products (Eftaxias et al, 2018). The substrates were fed semi-continuously into the digester using a peristaltic pump (Watson Marlow, UK) and a timer.…”

Section: Methodsmentioning

confidence: 99%

“…The former is designed with external separation and recirculation of the anaerobic biomass, while the latter implements membrane filtration to retain the anaerobic sludge inside the reactor. Under these conditions the washout of lipids and anaerobic biomass, which is often encountered in conventional CSTR digesters, is minimized or completely avoided, and the applied OLR can be increased up to 8 g L −1 d −1 as demonstrated in previous studies (Dereli et al, 2014; Diez et al, 2012; Eftaxias et al, 2018, 2019; Lienen et al, 2014).…”

Section: Introductionmentioning

confidence: 95%

“…The anaerobic contact process was previously utilized for the treatment of effluents (slaughterhouse, ice cream and bakery) characterized by a high lipid content (between 50% and 60% of total COD) (Eftaxias et al, 2018; Hawkes et al, 1995; Menkveld et al, 2018). The process enables methane (CH4) yield between 0.27 to 0.37 NL g −1 COD removed, with an overall COD removal efficiency between 82% and 98%.…”

Section: Introductionmentioning

confidence: 99%

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Performance of an anaerobic plug-flow reactor treating agro-industrial wastes supplemented with lipids at high organic loading rate

Eftaxias

Georgiou²,

Diamantis

et al. 2021

Waste Manag Res

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This study evaluated the performance of a plug-flow reactor (PFR) for high-rate anaerobic co-digestion of complex agro-industrial wastes and used cooking oil or animal fat. The PFR was successfully operated up to an organic loading rate (OLR) of 21 g L−1 d−1, yielding biogas at 0.35 L g−1 chemical oxygen demand (COD) influent. During the study period, supernatant COD at the PFR effluent remained between 4 and 7 g L−1, with negligible volatile fatty acids’ concentrations (<500 mg L−1) and no presence of foaming incidents. The biomass concentration inside the PFR, expressed as total suspended solids, remained between 30 and 60 g L−1. Moreover, the above-mentioned anaerobic digestion technology has been currently scaled-up at 50 m3 PFR, while a full-scale facility of 240 kW-el is under construction in the region of north-eastern Greece.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance of an anaerobic plug-flow reactor treating agro-industrial wastes supplemented with lipids at high organic loading rate

Eftaxias

Georgiou²,

Diamantis

et al. 2021

Waste Manag Res

Self Cite

View full text Add to dashboard Cite

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“…Methanogenesis, the last step, is considered to be the most critical part of the process with respect process failure due to variations in process conditions (temperature, pH, OLR and alkalinity) [14,15,16,17,18]. Therefore, depending on these conditions, stable process operation could only be possible when they co-exist in digesters.…”

Section: Introductionmentioning

confidence: 99%

Assessment of multiple anaerobic co-digestions and related microbial community of molasses with rice alcohol wastewater

Khan

Jiang

et al. 2020

Preprint

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Background Molasses is a highly dense and refined byproduct produced in the sugarcane industry, and it contains high amounts of degradable compounds. These compounds can potentially be converted into renewable products biologically. However, the involved biological process is negatively influenced by the high chemical oxygen demand (COD) of molasses and its high ion concentration, although this problem is commonly addressed by dilutions. Results The co-digestion of molasses with rice alcohol waste water (RAW) was compared with its mono-digestion at an increasing organic loading rate (OLR). Both processes were assessed by detecting the COD removal rate, the methane contents of biogas, and the structure and composition of microbial communities at different stages. Results showed that the co-digestion is stable up to a maximum OLR of 16 g COD L− 1d− 1. By contrast, after the acclimatization phase, the mono-digestion process was upset twice, which occurred at a maximum OLR of 9 and 10 g COD L− 1d− 1. The co-digestion procgess demonstrated consistency in terms of COD removal rates (86.36% ± 0.99–90.72% ± 0.63%) and methane contents (58.10% ± 1.12–64.47% ± 0.59%) compared with the mono-digestion process. Microbial community analysis showed that the relative abundance of bacterial and archaeal communities differs between the processes at different stages. However, in both processes, Propionibacteriaceae was the most abundant family in the bacterial communities, whereas Methanosaetaceae was abundant in the archaeal communities. Conclusion Rice alcohol wastewater could be a good co-substrate for anaerobic digestion of molasses. Integrate molasses into progressive biogas production at high OLR.

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Biogas production from chicken manure wastes using an LBR‐CSTR two‐stage system: process efficiency, economic feasibility, and carbon dioxide footprint

Kalogiannis

Vasiliadou

Spyridonidis

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND The growth of poultry farming has increased the amount of chicken manure (CM) being produced. In this study, CM was digested in a two‐stage anaerobic digestion (AD) system consisting of three leach bed reactors (LBRs) and a continuous stirred tank reactor (CSTR) coupled with sedimentation tanks (anaerobic contact process). The accumulated biomass and supernatant from the sedimentation tank were returned to the CSTR and the LBRs, respectively, resulting in an almost closed (water) circuit process. In addition, zeolite was used as bulking agent and adsorbent for ammonia in the LBRs. RESULTS This study revealed that the methane yield remained on average at 0.17 NL g−1 of Volatile Solids (VS), corresponding to the 43% of the CM biochemical methane potential as determined in separate batch tests (0.40 NL g−1 VS). Electrical conductivity gradually increased from 22 to 26 mS cm−1; however, the ammonia nitrogen concentration was stable at 2.28 g L−1, which was attributed to zeolite used as LBRs' bulking agent. A preliminary design of a full‐scale LBR‐CSTR facility was conducted for a poultry farm growing one million broilers per year. Its CO2 footprint was evaluated based on literature indices. CONCLUSION The proposed facility has a capacity of 130 kW Combined Heat and Power (CHP) and a payback period of 8.6 years. In terms of GHG emissions, implementing the LBR‐CSTR system for biogas production could potentially reduce the CO2 footprint of the farm from 1.38 to 0.49 kg CO2 eq/head. © 2022 Society of Chemical Industry (SCI).

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Anaerobic digestion of thermal pre-treated emulsified slaughterhouse wastes (TESW): Effect of trace element limitation on process efficiency and sludge metabolic properties

Cited by 38 publications

References 31 publications

Performance of an anaerobic plug-flow reactor treating agro-industrial wastes supplemented with lipids at high organic loading rate

Performance of an anaerobic plug-flow reactor treating agro-industrial wastes supplemented with lipids at high organic loading rate

Assessment of multiple anaerobic co-digestions and related microbial community of molasses with rice alcohol wastewater

Biogas production from chicken manure wastes using an LBR‐CSTR two‐stage system: process efficiency, economic feasibility, and carbon dioxide footprint

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