Activation of sulfite by FeS for anaerobic fermentation enhancement of waste activated sludge: Performance and mechanisms

Yang, Xianli; Yang, Jingnan; Liu, Xuran; Gong, Sheng; Ji, Xiaodi; Chang, Jianmin; Li, Chenxi; Pan, Qinyi; Wang, Dongbo

doi:10.1016/j.cej.2022.140913

Cited by 19 publications

(5 citation statements)

References 42 publications

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“…Differential abundance analysis showed two key short-chain fatty acid (SCFA) producers among the microbes that had significant changes at different time points, Sarcina and Proteiniclasticum , which were significantly increased in both the low-dose or high-dose groups after 4 and 8 weeks. These microbes produce SCFAs by fermenting nondigestible carbohydrates ( 30 , 31 ), which play a major role in host health. Dietary modification, particularly a fiber-rich diet, is a major factor associated with increased SCFA producers in the gut ( 32 ).…”

Section: Discussionmentioning

confidence: 99%

Red Ginseng Dietary Fiber Shows Prebiotic Potential by Modulating Gut Microbiota in Dogs

Song,

Lee,

et al. 2023

Microbiol Spectr

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Section: Discussionmentioning

confidence: 99%

Red Ginseng Dietary Fiber Shows Prebiotic Potential by Modulating Gut Microbiota in Dogs

Song,

Lee,

et al. 2023

Microbiol Spectr

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“…This result was further verified through EEM fluorescence spectroscopy, a commonly employed method for determining the concentration of soluble organics in liquid. There are two peaks (assigned as peak A and peak B) located at Ex/Em of 215–240/290–310 and 265–290/290–335 nm, which were considered to belong to aromatic proteins and tryptophan-like proteins, respectively . It was also found that, with the increase of capsaicin addition, the fluorescence intensity of peaks A and B both increased from 3338 and 3688 to 4652 and 6103, respectively.…”

Section: Resultsmentioning

confidence: 94%

“…There are two peaks (assigned as peak A and peak B) located at Ex/Em of 215−240/290−310 and 265− 290/290−335 nm, which were considered to belong to aromatic proteins and tryptophan-like proteins, respectively. 30 It was also found that, with the increase of capsaicin addition, the fluorescence intensity of peaks A and B both increased from 3338 and 3688 to 4652 and 6103, respectively. The above results indicated that the presence of capsaicin promoted solubilization and released more substrates into the fermentation liquid (Figure S3).…”

Section: Contribution Of Capsaicin Degradation To Scfa Productionmentioning

confidence: 89%

Uncovering the Mechanisms of How Capsaicin Affects Short-Chain Fatty Acid Production during Food Waste Valorization

Du,

Liu,

et al. 2023

ACS EST Eng.

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During food waste valorization to produce short-chain fatty acids (SCFAs), organic substrates are biotransformed step by step, but the effects of food additives that are present at high concentrations on these steps and targeted SCFA production have not been investigated. Therefore, this study aimed to address this knowledge gap by selecting capsaicin, a widely used food additive worldwide, as a representative additive. The results demonstrated a dose-dependent hormesis-like effect of capsaicin on the production of SCFAs. Specifically, the presence of 4 mg of capsaicin/g of volatile solids (VSs) increased SCFAs yield by 12.5%, while higher concentrations (8–64 mg of capsaicin/g of VS) caused a decrement of 22.5–62.9%. Notably, low levels of capsaicin accelerated the solubilization, hydrolysis, and acidification processes with the exception of solubilization and protein hydrolysis, which remained unaffected at higher levels. Additionally, the presence of capsaicin altered the bacterial cell membrane fluidity and led to an increase in reactive oxygen species (ROS). Slight accumulation of ROS stimulated metabolic activities, while excessive accumulation increased the level of microbial apoptosis. The low level of capsaicin enhanced SCFA production by upregulating gene expression associated with hydrolysis and SCFA bioconversion. Conversely, at high capsaicin levels, genes encoding components of the ribosomal subunit involved in polypeptide synthesis, cell migration, and survival regulation were downregulated, resulting in reduced microbial cell activity and SCFA production. This study provides valuable insights into the response mechanisms of complex microbial processes to capsaicin at the genetic level, specifically in SCFA production during anaerobic fermentation of food waste, and has implications in resource utilization of food waste (FW) containing exogenous additives.

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“…From the 12th day of AD, the propionic acid concentration (175.76 mg/L~57.19 mg/L) of R2 was always lower than that of R1 (198.31 mg/L~89.34 mg/L) and CK (178.17 mg/L~92.91 mg/L), because the presence of iron ions and sulfate in the PrS promotes the degradation of propionic acid [50,51]. Yang et al used FeS/sulfite-pretreated sludge for AD; they found that, with propionic acid and butyric acid as substrates, the presence of sulfate and iron ions can increase the degradation rates of propionic acid and butyric acid by 23.4% and 8.9%, respectively [50]. Previous studies have shown that iron ions can promote the conversion of propionic acid into acetic acid [52].…”

Section: Effect Of the Solar/fe (Ii)/ps Pretreatment Of Rs On Vfas An...mentioning

confidence: 96%

“…Compared with butyric acid, propionate has a high Gibbs free energy value and is thermodynamically difficult to degrade into acetic acid, which is easily utilized by Methanogens (Equations ( 1) and ( 2)) [49]. From the 12th day of AD, the propionic acid concentration (175.76 mg/L~57.19 mg/L) of R2 was always lower than that of R1 (198.31 mg/L~89.34 mg/L) and CK (178.17 mg/L~92.91 mg/L), because the presence of iron ions and sulfate in the PrS promotes the degradation of propionic acid [50,51]. Yang et al used FeS/sulfite-pretreated sludge for AD; they found that, with propionic acid and butyric acid as substrates, the presence of sulfate and iron ions can increase the degradation rates of propionic acid and butyric acid by 23.4% and 8.9%, respectively [50].…”

Section: Effect Of the Solar/fe (Ii)/ps Pretreatment Of Rs On Vfas An...mentioning

confidence: 98%

The Improvement of Rice Straw Anaerobic Co-Digestion with Swine Wastewater by Solar/Fe(II)/PS Pretreatment

Liu

Pan

2023

Sustainability

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Rice straw (RS) is among the agricultural waste products with the highest methane production potential in the world, but the refractory complex structure and high carbon-to-nitrogen ratio of RS cause low methane conversion efficiency and limit its widespread application in anaerobic digestion. In this study, Solar/Fe (II)/persulfate (PS) pretreatment of RS was investigated to improve microbial accessibility, and anaerobic co-digestion combined pretreated RS and swine wastewater (SW) were evaluated to improve the efficiency of anaerobic digestion. The results showed that the Solar/Fe (II)/PS pretreatment could disrupt the structure of RS and promote the reduction of sugar content, increasing microbial accessibility to RS. When all the components of the pretreated RS (including the use of the solution remaining from the pretreatment) were anaerobically co-digested with SW, the cumulative biogas production and cumulative methane production reached 252.10 mL/g·VS and 163.71 mL/g·VS, 19.18% and 36.97% higher than the anaerobic co-digestion of untreated RS and SW, respectively. The anaerobic co-digestion of the Solar/Fe (II)/PS-pretreated RS with SW is a promising approach to achieving the utilization of RS components and maximizing methane yields, providing a cost-effective and pollution-free method for the production of high-quality bioenergy from agricultural waste.

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Activation of sulfite by FeS for anaerobic fermentation enhancement of waste activated sludge: Performance and mechanisms

Cited by 19 publications

References 42 publications

Red Ginseng Dietary Fiber Shows Prebiotic Potential by Modulating Gut Microbiota in Dogs

Red Ginseng Dietary Fiber Shows Prebiotic Potential by Modulating Gut Microbiota in Dogs

Uncovering the Mechanisms of How Capsaicin Affects Short-Chain Fatty Acid Production during Food Waste Valorization

The Improvement of Rice Straw Anaerobic Co-Digestion with Swine Wastewater by Solar/Fe(II)/PS Pretreatment

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