Mechanisms of potassium permanganate pretreatment improving anaerobic fermentation performance of waste activated sludge

Xu, Qiuxiang; Fu, Qizi; Liu, Xuran; Wang, Dongbo; Wu, Yanxin; Li, Yifu; Yang, Jingnan; Yang, Qi; Wang, Yali; Li, Hailong; Ni, Bing‐Jie

doi:10.1016/j.cej.2020.126797

Cited by 73 publications

(40 citation statements)

References 56 publications

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“…In contrast, the SPC used for sludge disintegration was activated under strongly acidic (pH = 3) conditions with the addition of 20 mg/g Fe (II) or 200 mg/g TS zero-valent iron (ZVI), which would bring about higher costs because of the pH adjustment and extra Fe addition. , Therefore, the costs for SPC activation in this study would be much saved. In addition, the pretreatment for SPC oxidation could be performed within 24 h, which implied that the SPC-based technology could incur more efficient sludge pretreatment compared to other strategies such as CaO 2 , KMnO 4 , etc. , …”

Section: Resultsmentioning

confidence: 99%

“…In the process of biological wastewater treatment, most organic substances in wastewater are transformed into waste activated sludge (WAS) . As a response to the universal use of biological processes (e.g., the activated sludge process), a large quantity of WAS is produced daily . Therefore, the disposal of WAS is the primary challenge confronted by domestic wastewater treatment plants (WWTPs), as it occupies 55% of the total operational cost of a WWTP .…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Methane Production from Anaerobic Digestion of Waste Activated Sludge through a Novel Sodium Percarbonate (SPC) Pretreatment: Reaction Kinetics and Mechanisms

et al. 2022

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Sodium percarbonate (SPC), a harmless and economical inorganic peroxide, has recently attracted increasing attention in pollutant degradation and sludge treatment. However, the feasibility and mechanisms of SPC pretreatment on improving the anaerobic digestion of waste activated sludge (WAS) have never been revealed before. Therefore, this study is aimed to fill this research gap. The results showed that with the SPC dosage increasing from 0 to 0.3 g/g total suspended solids, the maximum methane production was enhanced by 37.2%. Model-based analysis indicated that SPC pretreatment concurrently enhanced the hydrolysis rate and biochemical methane potential of WAS. Mechanistic studies were performed from two stages, i.e., sludge disintegration and anaerobic digestion. SPC pretreatment accelerated sludge solubilization through disintegrating extracellular polymeric substances and cell walls of WAS, which provided substantial substrates for subsequent anaerobic digestion. Meanwhile, the active radicals contributing to pretreatment were proven to be OH, •O2 –, and CO3 •–. The strong oxidizing radicals promoted the conversion of organics from nonbiodegradable to biodegradable substances, thus improving the biodegradability of WAS. Furthermore, SPC pretreatment improved hydrolysis, acidogenesis, and methanogenesis bioprocesses of WAS and enriched key microbes involved in complex organic decomposition (e.g., Exiguobacterium sp.), metabolic intermediate generation (e.g., Clostridioides sp.), and methane conversion (Methanosaeta sp. and Candidatus_Methanofastidiosum sp.).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing Methane Production from Anaerobic Digestion of Waste Activated Sludge through a Novel Sodium Percarbonate (SPC) Pretreatment: Reaction Kinetics and Mechanisms

et al. 2022

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“…The sources of ROS involve oxygen due to the possible small amount of oxygen brought into MEC systems after routine operations and may involve some strong oxidants such as KMnO 4 . 141,177 Previously, the main objectives of adding oxidants included the removal of methanogens and promotion of substrate disintegration; however, ROS are increased by extracellular oxidative stress, leading to enhanced cellular Fenton reaction. 48,127 Moreover, the low DO in MECs also affects the activity of EAB, which further decreases H 2 production.…”

Section: Suppression Of Ros Derived From Cellular Fentonmentioning

confidence: 99%

“…As a strong oxidizing agent, KMnO 4 is capable of inactivating methanogens by oxidizing the key metabolic coenzyme F 420 . − Xu et al found that the chemical oxygen demand (COD) content used for CH 4 production decreased from 4.77% ± 0.05% to 0.02% ± 0.01% and the specific activity of methanogens declined by 73.3% when the KMnO 4 dosage increased from 0 to 0.2 g/g total suspended solids (TSS). Furthermore, KMnO 4 can also combine with other agents to change the methanogenic community, exerting a more significant effect than a single-KMnO 4 pretreatment.…”

Section: Approaches To Suppress Methane Production In Mecsmentioning

confidence: 99%

Suppressing Methane Production to Boost High-Purity Hydrogen Production in Microbial Electrolysis Cells

Tang

et al. 2022

Environ. Sci. Technol.

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Hydrogen gas (H2) is an attractive fuel carrier due to its high specific enthalpy; moreover, it is a clean source of energy because in the combustion reaction with oxygen (O2) it produces water as the only byproduct. The microbial electrolysis cell (MEC) is a promising technology for producing H2 from simple or complex organics present in wastewater and solid wastes. Methanogens and non-archaeal methane (CH4)-producing microorganisms (NAMPMs) often grow in the MECs and lead to rapid conversion of produced H2 to CH4. Moreover, non-archaeal methane production (NAMP) catalyzed by nitrogenase of photosynthetic bacteria was always overlooked. Thus, suppression of CH4 production is required to enhance H2 yield and production rate. This review comprehensively addresses the principles and current state-of-the-art technologies for suppressing methanogenesis and NAMP in MECs. Noteworthy, specific strategies aimed at the inhibition of methanogenic enzymes and nitrogenase could be a more direct approach than physical and chemical strategies for repressing the growth of methanogenic archaea. In-depth studies on the multiomics of CH4 metabolism can possibly provide insights into sustainable and efficient approaches for suppressing metabolic pathways of methanogenesis and NAMP. The main objective of this review is to highlight key concepts, directions, and challenges related to boosting H2 generation by suppressing CH4 production in MECs. Finally, perspectives are briefly outlined to guide and advance the future direction of MECs for production of high-purity H2 based on genetic and metabolic engineering and on the interspecific interactions.

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“…However, the anaerobic fermentation technology of sludge has the disadvantages of long fermentation cycle and low organic matter conversion efficiency (Gonzalez et al, 2018;Xu et al, 2021). The main reason is that most of the organic substance is wrapped in the sludge floc and the cell wall (membrane) structure of microorganism, and the cell structure of microorganism is very stable (Pang et al, 2020b;Zhang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Mechanism of dielectric barrier discharge plasma technology to improve the quantity of short-chain fatty acids in anaerobic fermentation of waste active sludge

et al. 2022

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The mechanism of improving the anaerobic fermentation performance of waste active sludge by using dielectric barrier discharge (DBD) plasma pretreatment technology was investigated. The maximum accumulation of short-chain fatty acids (SCFAs) was observed on the 7th day of anaerobic fermentation when the DBD power was 76.50 W, which was 1726.70 mg COD/L, 1.50 times of the control group. The ratio of acetic acid in DBD group was 9.30% higher than that in the control. Further mechanism research indicated that DBD pretreatment can destroy the structure of extracellular polymer substances and release organic substances such as protein and polysaccharide. The dissolved organic matter analysis indicated that the DBD technique could increase the release of biodegradable organics (eg., tyrosine proteins, soluble microbial by-products), thus accelerate the biotransformation of organic substance. Bacterial community structure analysis showed that the increase in the abundance of Firmicutes and Bacteroidetes and the decrease in the abundance of Proteobacteria in DBD group were beneficial to the accumulation of SCFAs. Besides, further archaeal analysis indicated that the decrease of Methanosaeta sp. and Methanosarcina sp. abundance in the DBD group facilitate acetic acid accumulation. This study demonstrated that the DBD technique can be used as an effective and potential pretreatment method to improve sludge anaerobic fermentation performance.

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Mechanisms of potassium permanganate pretreatment improving anaerobic fermentation performance of waste activated sludge

Cited by 73 publications

References 56 publications

Enhancing Methane Production from Anaerobic Digestion of Waste Activated Sludge through a Novel Sodium Percarbonate (SPC) Pretreatment: Reaction Kinetics and Mechanisms

Enhancing Methane Production from Anaerobic Digestion of Waste Activated Sludge through a Novel Sodium Percarbonate (SPC) Pretreatment: Reaction Kinetics and Mechanisms

Suppressing Methane Production to Boost High-Purity Hydrogen Production in Microbial Electrolysis Cells

Mechanism of dielectric barrier discharge plasma technology to improve the quantity of short-chain fatty acids in anaerobic fermentation of waste active sludge

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