Anaerobic co-digestion of sewage sludge, food waste and yard waste: Synergistic enhancement on process stability and biogas production

Mu, Lan; Zhang, Lei; Zhu, Kongyun; Ma, Jun; Ifran, Muhammad; Li, Aimin

doi:10.1016/j.scitotenv.2019.135429

Cited by 108 publications

(46 citation statements)

References 55 publications

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“…Moreover, molasses contains some lethal compounds like benzoic acid, threonine and phenyl ethyl alcohol which inhibit methanogenesis [35,36]. Several other factors like pH drop, increase in VFA concentration may cause inhibition [37,38]. Therefore, due to these reasons, failure in the mono-digestion process of molasses negatively impacts the microbial community of the system.…”

Section: Resultsmentioning

confidence: 99%

“…Similar to our results, De Vrieze et al [46] obtained high methane content when molasses was digested with kitchen waste at an OLR value lower than 5 g COD L − 1 .d − 1 . Moreover, Mu et al [38] reported a synergistic effect on methane production.…”

Section: Methane Contents In Biogas Under Different Olr Conditionsmentioning

confidence: 99%

“…This drop-in pH in monodigestion led to the process of instability. The stability in pH of co-digestion suggests that the process is highly buffered [38]. De Vreize et al [10] reported that digesting molasses as a single substrate at high OLR can cause a drop in pH, probably due to high salt contents in molasses or de ciency of some important micronutrients.…”

Section: Impact Of Increasing Olr On Phmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Methane Contents In Biogas Under Different Olr Conditionsmentioning

confidence: 99%

Section: Impact Of Increasing Olr On Phmentioning

confidence: 99%

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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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show abstract

“…Similar to our results, De Vrieze et al [30] obtained high methane content when molasses was digested with kitchen waste at an OLR value lower than 5 g COD L −1 d −1 . Moreover, Mu et al [31] reported a synergistic effect on methane production during co-digestion. Methanogenic activity in co-digestion presented less variation throughout the process compared to mono-digestion.…”

Section: Methane Contents In Biogas Under Different Olr Conditionsmentioning

confidence: 99%

“…This drop in pH in mono-digestion led to the process of instability. The stability in pH of co-digestion suggests that the process is highly buffered [31]. De Vrieze et al [23] reported that digesting molasses as a single substrate at high OLR can cause a drop in pH, probably due to high salt contents in molasses or a deficiency in some important micronutrients.…”

Section: Impact Of Increasing Olr On Phmentioning

confidence: 99%

Assessment of Multiple Anaerobic Co-Digestions and Related Microbial Community of Molasses with Rice-Alcohol Wastewater

Khan

Jiang

et al. 2020

Energies

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Molasses is a highly dense and refined byproduct produced in the sugarcane industry, and it contains high amounts of degradable compounds. Through bioconversion, these compounds can be transformed into renewable products. However, the involved biological process is negatively influenced by the high chemical oxygen demand (COD) of molasses and ion concentration. The co-digestion of molasses with rice-alcohol wastewater (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−1 d−1, whereas after the acclimatization phase, the mono-digestion process was disturbed two times, which occurred at a maximum OLR of 9 and 10 g COD L−1 d−1. The volatile fatty acids (VFAs) observed were 2059.66 mg/L and 1896.9 mg/L, which in mono-digestion causes the inhibition at maximum OLRs. In the co-digestion process, the concomitant COD removal rates and methane content recorded was 90.72 ± 0.63% 64.47% ± 0.59% correspondingly. While in the mono-digestion process, high COD removal rate and methane contents observed were 89.29 ± 0.094% and 61.37 ± 1.06% respectively. From the analysis of microbial communities, it has been observed that both the bacterial and archaeal communities respond differently at unlike stages. However, in both processes, Propionibacteriaceae was the most abundant family in the bacterial communities, whereas Methanosaetaceae was abundant in the archaeal communities. From the current study, it has been concluded that that rice-alcohol wastewater could be a good co-substrate for the anaerobic digestion of molasses in terms of COD removal rate and methane contents production, that could integrate molasses into progressive biogas production with high OLR.

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A Review on Technological Approach for Obtaining Nutrient from Solid Waste

Karthika¹,

Seenivasagan

Muthunarayanan

2021

Emerging Contaminants and Associated Treatment Technologies

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Anaerobic co-digestion of sewage sludge, food waste and yard waste: Synergistic enhancement on process stability and biogas production

Cited by 108 publications

References 55 publications

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

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

Assessment of Multiple Anaerobic Co-Digestions and Related Microbial Community of Molasses with Rice-Alcohol Wastewater

A Review on Technological Approach for Obtaining Nutrient from Solid Waste

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