Improving anaerobic fermentation of waste activated sludge using iron activated persulfate treatment

Luo, Jingyang; Zhang, Qin; Wu, Lijuan; Feng, Qian; Fang, Fang; Xue, Zhaoxia; Li, Chao; Cao, Jiashun

doi:10.1016/j.biortech.2018.06.080

Cited by 109 publications

(20 citation statements)

References 43 publications

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“…en, the production of SCFA gradually decreased until day 8, and the total SCFA content in all reaction systems increased slightly and reached the second peak on day 9. en, the production of SCFA continued to decrease in the remaining time. e two increasing trends of SCFA production during anaerobic fermentation are inconsistent with the results of previous studies [47,48]. Further data analysis showed that the concentration of DEHP in the reaction system did not significantly change the yield of SCFA.…”

Section: Effect Of Dehp On Scfa Production By Sludge Anaerobiccontrasting

confidence: 82%

Effect of DEHP on SCFA Production by Anaerobic Fermentation of Waste Activated Sludge

Gong

Tang

Fan

et al. 2020

Advances in Polymer Technology

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Diethylhexyl phthalate (DEHP) is a common plasticizer in industrial production. Recently, environmental problems caused by microplastics have drawn wide attention. As the microplastics have a large specific surface area, the release rate of the plasticizer from the microplastics to the environment is accelerated. e DEHP in the wastewater enters the wastewater treatment plants (WWTPs) along with the urban pipeline. After DEHP enters the WWTPs, it may affect the anaerobic fermentation with waste activated sludge (WAS) as raw material. So far, there has been no study on the effect of DEHP on anaerobic fermentation of WAS. Our study focused on the impact of exogenous DEHP on WAS anaerobic fermentation, and the results showed that DEHP mainly affects the solubilization stage of sludge anaerobic digestion, but has no significant effect on other stages. It does not affect the total yield and composition of short-chain fatty acids (SCFA). However, DEHP inhibited the solubilization process of WAS anaerobic fermentation, which was mainly manifested by the changes of soluble protein and soluble polysaccharide in the system. e results of the analysis of microbial communities revealed that the addition of DEHP did not change the diversity of microbial communities, but caused a change in the abundance of microbial organisms. DEHP reduced the abundance of acetogen bacteria and increased the abundance of methanogens. is work provides some insights into WAS fermentation systems in the presence of DEHP and helps to gain a better understanding of the potential environmental hazards of microplastics.

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Section: Effect Of Dehp On Scfa Production By Sludge Anaerobiccontrasting

confidence: 82%

Effect of DEHP on SCFA Production by Anaerobic Fermentation of Waste Activated Sludge

Gong

Tang

Fan

et al. 2020

Advances in Polymer Technology

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“…The fluorescence peak location and intensity in different reactors mean the variation of fluorescing substances. For example, the red‐shift of the fluorescence peak is connected with the increase of some functional groups such as hydroxyl, carboxyl and carbonyl, while a blue‐shift of the fluorescence peak means a decline in these groups …”

Section: Resultsmentioning

confidence: 99%

“…, there are three main typical fluorescent signals in all the samples. The fluorescent signals located at the excitation/emission wavelengths of 250–400/320–380 (Peak A), 220–255/330–380 (Peak B), and 250–400/380–500 (Peak C) are ascribed to microbial by‐products, tryptophan protein‐like substances and humic acid‐like substances, respectively . Among the earlier materials, microbial by‐products are thought to be biodegradable substances, while tryptophan protein‐like and humic acid‐like substances are considered as non‐biodegradable compounds .…”

Section: Resultsmentioning

confidence: 99%

“…The analysis of key enzyme activities (see Supporting Information Methods S2) is considered to be an effective approach to characterize the role of microorganisms in hydrolysis, acidification and methanation processes . As can be seen in Supporting Information, Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Most organic substance in sludge are protected by extracellular polymeric substances (EPSs) and microbial cell wall, which are difficult to be used by microbial for SCFA generation . In order to enhance SCFA production from anaerobic fermentation, various treatment processes (such as physical, chemical and biological) are commonly applied, either as a single treatment method or in combination . Among these methods, the advanced oxidation process (AOP) (such as Fenton, CaO 2 , etc.)…”

Section: Introductionmentioning

confidence: 99%

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A novel and effective pretreatment to stimulate short‐chain fatty acid production from waste activated sludge anaerobic fermentation by ferrous iron catalyzed peracetic acid

Wang

Shang

Guo

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: This study investigates a novel, efficient and green pretreatment approach using ferrous iron catalyzed peracetic acid oxidation (Fe 2+ /PAA) on anaerobic fermentation of waste activated sludge. The underlying mechanisms are also studied for both the chemical and microbial effects. RESULTS:The results indicate that Fe 2+ /PAA exhibit significant positive synergistic effect on short-chain fatty acid (SCFA) generation, especially acetic acid. The maximal SCFA concentration of 272 mg COD g −1 VSS is obtained with Fe 2+ (2.7 mmol L -1 )/PAA (3.0 mmol L -1 ), which is 5.2 times that of the control test. Fe 2+ /PAA can effectively facilitate sludge solubilization due to the disruption of extracellular polymeric substances structure and microbial cells. The biodegradability of released organic substance is also improved due to the oxidation of non-biodegradable substances. The activity of functional enzymes for hydrolysis and acidification is enhanced but that for methanogenesis is inhibited. Further analysis on microbial community structure indicates that phylum Firmicutes and genera Proteiniclasticum showed the maximal positive correlation with SCFA production, while the abundance of methanogenic archaea especially acetoclastic methanogenic archaea is inhibited by Fe 2+ /PAA treatment. Moreover, the presence of Fe 2+ lengthened the oxygen release period of PAA, the main functional reactive oxygen species are hydroxyl radicals and Fe 2+ facilitated PAA generates more hydroxyl radicals thus enhancing the oxidation ability of PAA.CONCLUSION: This study demonstrated that Fe 2+ /PAA can be used as an effective pretreatment method for SCFA accumulation in sludge anaerobic fermentation process. The findings obtained in this study will supply information for the application of Fe 2+ catalyzed PAA pre-oxidation in sludge treatment.

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Biomethane Production and Advancement

et al. 2021

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Improving anaerobic fermentation of waste activated sludge using iron activated persulfate treatment

Cited by 109 publications

References 43 publications

Effect of DEHP on SCFA Production by Anaerobic Fermentation of Waste Activated Sludge

Effect of DEHP on SCFA Production by Anaerobic Fermentation of Waste Activated Sludge

A novel and effective pretreatment to stimulate short‐chain fatty acid production from waste activated sludge anaerobic fermentation by ferrous iron catalyzed peracetic acid

Biomethane Production and Advancement

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