Complex network analysis of slaughterhouse waste anaerobic digestion: From failure to success of long-term operation

Dalantai, Tergel; Rhee, Chaeyoung; Kim, Dae Wook; Yu, Sung Il; Shin, Juhee; Triolo, Jin Mi; Shin, Seung Gu

doi:10.1016/j.biortech.2022.127673

Cited by 9 publications

(5 citation statements)

References 37 publications

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“… Additionally, antibiotic resistance genes (ARGs) are commonly found in AM, , SL, and wastewater due to the extensive use of antibiotics and antiparasitic drugs in animal husbandry. , Therefore, AD of these waste streams, particularly under thermophilic conditions, can mitigate the spread of pathogens and ARGs . However, mono-digestion of SL, particularly under thermophilic conditions, is often inhibited by ammonia and VFAs, posing a challenge to digester stability. , While AM:SL AcoD likely contributes to digestor stability, it did not improve SMY compared with the mono-digestion of AM (ROM = 1.11, p < 0.05, n = 3).…”

Section: Resultsmentioning

confidence: 98%

“…142 However, mono-digestion of SL, particularly under thermophilic conditions, is often inhibited by ammonia and VFAs, posing a challenge to digester stability. 143,144 While AM:SL AcoD likely contributes to digestor stability, it did not improve SMY compared with the mono-digestion of AM (ROM = 1.11, p < 0.05, n = 3).…”

Section: Co-digestion Of Agricultural Wastes and Residuesmentioning

confidence: 86%

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Understanding Anaerobic Co-digestion of Organic Wastes through Meta-Analysis

Chuenchart,

Surendra,

Khanal

2024

ACS EST Eng.

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Anaerobic co-digestion (AcoD) is becoming increasingly popular in the biogas industry for its numerous advantages over mono-digestion, including balanced nutrient profiles, enhanced process stability, synergistic methane production, and reduced greenhouse gas emissions. However, varying results across AcoD studies highlight the need for an extensive meta-analysis of a large data set to better understand these synergies. Here, we compared methane yields from 432 data sets, based on the ratio of means, from AcoD and mono-digestion. The relative synergistic index (RSI) revealed synergistic effects in AcoD of lignocellulosic biomass with animal manures, particularly pig (RSI = 1.91) and chicken manures (RSI = 1.71). Due to its rapid biodegradability, food waste AcoD also demonstrated synergistic effects with both animal manures (RSI = 1.28) and lignocellulosic biomass (RSI = 1.41). After regrouping data by high-carbon cosubstrates, interpretable machine learning models identified temperature, which accelerates the hydrolysis of lignocellulosic biomass and emulsification of fats, oils, and grease, as the key factor influencing methane yield. Furthermore, experimental validation using food waste and sewage sludge co-digestion confirmed the superiority of multivariable linear regression in predicting specific methane yield over other models in terms of simplicity and efficiency.

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Section: Resultsmentioning

confidence: 98%

Section: Co-digestion Of Agricultural Wastes and Residuesmentioning

confidence: 86%

Understanding Anaerobic Co-digestion of Organic Wastes through Meta-Analysis

Chuenchart,

Surendra,

Khanal

2024

ACS EST Eng.

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“…The UASB reactor showed good nitrification by transforming nitrites into nitrates and performed adequate denitrification (Figures 6 and 7). The high levels of protein present in the SWW favored increases in the fatty acid and nitrogen compound concentrations, inhibiting methanogenesis [3]. Therefore, it is evident that the UASB alone would not have achieved high removal efficiencies and that the combination of this treatment with an aerobic technology increased these efficiencies.…”

Section: Operational Parametersmentioning

confidence: 99%

“…The liquid effluents generated at municipal slaughterhouses cause severe pollution owing to their high organic load, showing a biochemical oxygen demand (BOD) ranging between 5000 and 10,000 mg/L. In addition, they have high contents of solids, nutrients, fats, and oils, which are pollutants with low biodegradability [3]. Therefore, if these wastewaters are not adequately treated, they may contribute to the degradation of the receiving environment, including water and soil [4,5].…”

Section: Introductionmentioning

confidence: 99%

Treatment of Slaughterhouse Wastewater through a Series System: Upflow Anaerobic Reactor and Artificial Wetland

Galindo Montero,

Berrio Arrieta,

Pimienta Serrano

2024

Water

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Slaughterhouse wastewater is characterized by high concentrations of organic matter. This creates a need to explore methods for its treatment before discharge. This study evaluated the efficiency of an integrated treatment process consisting of a laboratory-scale upflow anaerobic sludge blanket reactor and a pilot-scale horizontal subsurface flow wetland. This treatment was used for (i) the removal of organic matter through anaerobic–aerobic microbiological processes, (ii) the conversion of organic matter from hydraulic processes, and (iii) for bioremediation and phytoremediation. The treatment system was evaluated at hydraulic retention times (HRTs) of 7.5, 5.0, and 2.5 d; during the investigation, the influence of the HRTs on the removal efficiency of the system was evaluated. High efficiencies of 85% and 75% were obtained for CODT and BOD, respectively, at an HRT of 7.5 d. The highest overall efficiency for the removal of total solids was observed at an HRT of 2.5 d. The results obtained confirm the feasibility of implementing the suggested system as an alternative for the adequate and sustainable treatment of slaughterhouse wastewater, and the system can be applied to slaughterhouses with similar conditions to those in this study.

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“…In a comparable study by Rodríguez-Méndez et al [19], the highest methane yield of 0.66 NL CH4 •g TS eli −1 was achieved in a stirred anaerobic reactor at a OLR of 0.83 g TS •L −1 •d −1 ; whereby, clear inhibition of the methane yield could be observed from a OLR above 1.5 g TS •L −1 •d −1 . In the study by Dalantai et al [20], an investigation was carried out of counteracting the inhibition with ammonium and volatile fatty acid in SW digestion, by slowly adding degradable lignocellulosic carbon. Using liquid-state digestion, a methane yield of 0.65 NL CH4 •g TS eli −1 with an OLR of 1.8 g TS •L −1 •d −1 was achieved, although ammonium concentrations of 4.7 g•L −1 and volatile fatty acid concentrations of 1.9 g•L −1 were measured in the reactor.…”

Section: Continuous Mesophilic Digestion Of Slaughter Wastementioning

confidence: 99%

Possibilities for Anaerobic Digestion of Slaughter Waste and Flotates for Biomethane Production

Philipp

Ackermann

Barbana

et al. 2023

Water

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Anaerobic digestion for biomethane production is an important tool regarding sustainable energy production. The objective of this study was to investigate the effects of the substrate composition and operating parameters on biomethane production during anaerobic digestion, focusing on the use of flotates and slaughterhouse waste as substrates with a high organic content. A novelty here was the use of a moving bed biofilm reactor (MBBR) with circulation pump for the anaerobic treatment of flotates, slaughter waste (SW), and their mixture. Flotates and waste from slaughterhouses offer a substrate with a high organic content. In this work, it was shown that both substrates provide a high biochemical methane potential (BMP). The highest methane yield was achieved by mixing both substrates. In continuous operation, special challenges arose, due to the high nitrogen and fat content of the substrates. These could be overcome by mixing the substrates and using a circulation pump in the reactor for improved back-mixing. As a result, the highest average methane yield of 0.65 NLCH4·gTS eli−1 was achieved in mesophilic operation at an organic loading rate (OLR) of 4.2 gTS·L−1·d−1.

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Complex network analysis of slaughterhouse waste anaerobic digestion: From failure to success of long-term operation

Cited by 9 publications

References 37 publications

Understanding Anaerobic Co-digestion of Organic Wastes through Meta-Analysis

Understanding Anaerobic Co-digestion of Organic Wastes through Meta-Analysis

Treatment of Slaughterhouse Wastewater through a Series System: Upflow Anaerobic Reactor and Artificial Wetland

Possibilities for Anaerobic Digestion of Slaughter Waste and Flotates for Biomethane Production

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