Fermentative Hydrogen Production Using Disintegrated Waste-Activated Sludge by Low-Frequency Ultrasound Pretreatment

Yin, Yanan; Yang, Guang; Wang, Jianlong

doi:10.1021/acs.energyfuels.7b03263

Cited by 17 publications

(5 citation statements)

References 51 publications

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“…In fact, the ammonia oxidation ratio in both reactors was above 95%, and the ammonia oxidation rate remained stable in ultrasonic samples, with an average value [5.95 mg N/(h·g MLSS)] even slightly higher than that of the samples without sonication [4.44 mg N/(h·g MLSS)]. A similar promotional effect of low-intensity ultrasound on ammonium oxidation was also reported in other metabolic pathways, such as hydrogen production (Yin et al, 2018 ), iron-sulfur cluster biosynthesis (Zhang et al, 2020 ), and ATP release (Belcik et al, 2017 ).…”

Section: Resultssupporting

confidence: 72%

Changes in the Species and Functional Composition of Activated Sludge Communities Revealed Mechanisms of Partial Nitrification Established by Ultrasonication

Xue

Zheng

et al. 2022

Front. Microbiol.

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To achieve energy-efficient shortcut nitrogen removal of wastewater in the future, selective elimination of nitrite-oxidizing bacteria (NOB) while enriching ammonia-oxidizing microorganisms is a crucial step. However, the underlying mechanisms of partial nitrification are still not well understood, especially the newly discovered ultrasound-based partial nitrification. To elucidate this issue, in this study two bioreactors were set up, with one established partial nitrification by ultrasonication while the other didn't. During the operation of both reactors, the taxonomic and functional composition of the microbial community were investigated through metagenomics analysis. The result showed that during ultrasonic partial nitrification, ammonia-oxidizing archaea (AOA), Nitrososphaerales, was enriched more than ammonia-oxidizing bacteria (AOB), Nitrosomonas. The enrichment of microorganisms in the community increased the abundance of genes involved in microbial energy generation from lipid and carbohydrates. On the other hand, the abundance of NOB, Nitrospira and Nitrolancea, and Comammox Nitrospira decreased. Selective inhibition of NOB was highly correlated with genes involved in signal transduction enzymes, such as encoding histidine kinase and serine/threonine kinase. These findings provided deep insight into partial nitrification and contributed to the development of shortcut nitrification in wastewater treatment plants.

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Section: Resultssupporting

confidence: 72%

Changes in the Species and Functional Composition of Activated Sludge Communities Revealed Mechanisms of Partial Nitrification Established by Ultrasonication

Xue

Zheng

et al. 2022

Front. Microbiol.

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“…Hydrogen production was calculated according to the modified Gompertz equation (eq ). H represents the cumulative hydrogen production at time t (mL). R m represents the maximum hydrogen production rate (mL/h).…”

Section: Methodsmentioning

confidence: 99%

Synergistic Biohydrogen Production from Flower Wastes and Sewage Sludge

Yang

Wang

2018

Energy Fuels

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The co-fermentation of mixed substrates is a promising process compared with single substrate fermentation with regard to substrate characteristics. In this paper, the technical feasibility for improving hydrogen production by co-fermenting sewage sludge and flower waste at different mixed ratios was evaluated using batch tests. The experimental results showed that co-fermentation of flower waste and sludge synergistically improved the efficiency of hydrogen production. The highest hydrogen yield was 39 mL/g-VSadded (VS, volatile solid) when the ratio of sludge to flower waste was 10:90, which was 460% and 30% higher than those from only sludge and only flower waste, respectively. The maximum VS removal was 15.2% when the sludge/flower waste ratio was 10:90, compared with the values of 4.4% and 10.6% from sludge and flower waste, respectively. Co-fermentation induced higher microbial activity and a more efficient fermentation pathway. Furthermore, co-fermentation enriched high relative abundances of both Clostridium sp. (48.1%) and Enterococcus sp. (37.8%) for more efficient hydrogen fermentation.

show abstract

“…In fact, the ammonia oxidation ratio in both reactors was above 95%, and the ammonia oxidation rate remained stable in ultrasonic samples, with an average value [5.95 mg N/(h•g MLSS)] even slightly higher than that of the samples without sonication [4.44 mg N/(h•g MLSS)]. A similar promotional effect of low-intensity ultrasound on ammonium oxidation was also reported in other metabolic pathways, such as hydrogen production (Yin et al, 2018), iron-sulfur cluster biosynthesis (Zhang et al, 2020), and ATP release (Belcik et al, 2017).…”

Section: Performance Of Reactor During Partial Nitrificationsupporting

confidence: 71%

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Fermentative Hydrogen Production Using Disintegrated Waste-Activated Sludge by Low-Frequency Ultrasound Pretreatment

Cited by 17 publications

References 51 publications

Changes in the Species and Functional Composition of Activated Sludge Communities Revealed Mechanisms of Partial Nitrification Established by Ultrasonication

Changes in the Species and Functional Composition of Activated Sludge Communities Revealed Mechanisms of Partial Nitrification Established by Ultrasonication

Synergistic Biohydrogen Production from Flower Wastes and Sewage Sludge

Table_1.XLSX

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