Stepwise pH control to promote synergy of chemical and biological processes for augmenting short-chain fatty acid production from anaerobic sludge fermentation

Wang, Xu; Li, Yanbo; Zhang, Ya Ping; Pan, Yuanlong; Li, Lin; Liu, Junxin; Butler, David

doi:10.1016/j.watres.2019.02.032

Cited by 108 publications

(20 citation statements)

References 52 publications

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“…In addition, damaged bacterial cells by hot wood ash extract (60-70 • C, pH 10.8-11.5) may be produced at the beginning of the fermentation. In addition, dead bacterial cells resulting from the initial treatment may be candidate substrates for obligate anaerobes (i.e., Proteinivoraceae and Tissierellaceae) as the taxa related to obligate anaerobes are known as sludge decomposers (Maspolim et al, 2015;Wang et al, 2019). The dead or weakened bacterial cell components may also be derived from transitional changes in the predominant bacteria, especially in the decrease in ORP at the early fermentation stage.…”

Section: Discussionmentioning

confidence: 99%

“…The dead or weakened bacterial cell components may also be derived from transitional changes in the predominant bacteria, especially in the decrease in ORP at the early fermentation stage. The decomposition of dead bacterial cells would be promoted chemically under high alkaline conditions (Wang et al, 2019). In the later phase, after the amount of substrates decreased, the second major substrates for the bacteria were wheat bran, which was added to the fermentation fluids at days 22 and 35 in Batches 1 and 3, respectively.…”

Section: Discussionmentioning

confidence: 99%

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The Mechanism Underlying of Long-Term Stable Indigo Reduction State in Indigo Fermentation Using Sukumo (Composted Polygonum tinctorium Leaves)

Lopes

Narihiro

et al. 2021

Front. Microbiol.

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Indigo fermentation fluid maintains its indigo-reducing state for more than 6 months under open-air. To elucidate the mechanism underlying the sustainability of this indigo reduction state, three indigo fermentation batches with different durations for the indigo reduction state were compared. The three examined batches exhibited different microbiota and consisted of two phases. In the initial phase, oxygen-metabolizing-bacteria derived from sukumo established an initial network. With decreasing redox potential (ORP), the initial bacterial community was replaced by obligate anaerobes (mainly Proteinivoraceae; phase 1). Approximately 1 month after the beginning of fermentation, the predominating obligate anaerobes were decreased, and Amphibacillus and Polygonibacillus, which can decompose macromolecules derived from wheat bran, were predominantly observed, and the transition of microbiota became slow (phase 2). Considering the substrate utilization ability of the dominated bacterial taxa, the transitional change from phase 1 to phase 2 suggests that this changed from the bacterial flora that utilizes substrates derived from sukumo, including intrinsic substrates in sukumo and weakened or dead bacterial cells derived from early events (heat and alkaline treatment and reduction of ORP) to that of wheat bran-utilizers. This succession was directly related to the change in the major substrate sustaining the corresponding community and the turning point was approximately 1 month after the start of fermentation. As a result, we understand that the role of sukumo includes changes in the microbial flora immediately after the start of fermentation, which has an important function in the start-up phase of fermentation, whereas the ecosystem comprised of the microbiota utilizing wheat bran underpins the subsequent long-term indigo reduction.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Mechanism Underlying of Long-Term Stable Indigo Reduction State in Indigo Fermentation Using Sukumo (Composted Polygonum tinctorium Leaves)

Lopes

Narihiro

et al. 2021

Front. Microbiol.

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“…The research performed by Zhou et al (2016) involved photometric analysis showed that the supernatant and membrane foulants in a submerged anaerobic membrane bioreactor (SAnMBR) were dominated by 90% of the total proteins and polysaccharides. At alkaline condition, the rate of initial hydrolysis of organic components is higher compared to the rates in neutral to acidic pH condition (Wang et al, 2019). The result of a high rate in initial hydrolysis can be a potential reason to increase the soluble proteins and carbohydrates in the reactor and finally accelerate the membrane fouling process (Li et al, 2019b).…”

Section: Membrane Fouling At Different Levels Of Phmentioning

confidence: 99%

Selective production of volatile fatty acids at different pH in an anaerobic membrane bioreactor

Khan

Ngo

Guo

et al. 2019

Bioresource Technology

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This study investigated the production of major volatile fatty acid (VFA) components in an anaerobic membrane bioreactor (AnMBR) to treat low-strength synthetic wastewater. No selective inhibition was applied for methane production and solvent-extraction method was used for VFA extraction. The results showed acetic and propionic acid were the predominant VFA components at pH 7.0 and 6.0 with concentrations of 1.444 ± 0.051 and 0.516 ± 0.032 mili-mol/l respectively. At pH 12.0 isobutyric acid was the major VFA component with a highest concentration of 0.712 ± 0.008 mili-mol/l. The highest VFA yield was 48.74 ± 1.5 mg VFA/ 100 mg CODfeed at pH 7.0. At different pH, AnMBR performance was evaluated in terms of COD, nutrient removal and membrane fouling rate. It was observed that the membrane fouled at a faster rate in both acidic and alkaline pH conditions, the slowest rate in membrane fouling was observed at pH 7.0.

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“…Proteobacteria, Bacteroidetes, and Firmicutes dominated in FCS community (Fig 6A). The high abundance of Firmicutes (40.9% and 20.5% in spring and summer, respectively) in FCS might be attributed to the high level of organic pollution and low DO (Fig 2) as members in Firmicutes have been known for fermenting organic matters anaerobically and producing volatile organic acids [31,32]. The predominant taxa in FCS community, such as Novosphingobium, Acinetobacter, Flavobacterium, Geobacter, and Dechloromonas were also identified in other heavily polluted urban river sediments and anaerobic active sludge (Fig 6C) [31,33].…”

Section: Plos Onementioning

confidence: 99%

“…Compared with LHS, fermentation and sulfate reduction bacteria existed in high abundance in FCS (Fig 7), which might be explained by the niche selection and adaptation of such functional bacteria to the environment of high carbon and low DO content (Figs 1 and 2). The fermentative process is not effective for mineralization of organics, and the production of fermentation, such as short-chain fatty acids would contribute to the stench odor of urban river [31]. The production of FeS, H 2 S, organic sulfides, NH 3 , amines, and short chain fatty acids through sulfate reduction and fermentation was considered as the main cause of the black and stench of urban rivers [8].…”

Section: Difference Of Bacterial Communities In An Urban Center and Smentioning

confidence: 99%

Insight into the nitrogen accumulation in urban center river from functional genes and bacterial community

Liu

Jiang

et al. 2020

PLoS ONE

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Along with urbanization, the intensified nitrogen pollution in urban rivers and the form of black-odor rivers has become one of the biggest concerns. Better understanding of the nitrogen transformations and microbial mechanisms occurring within urban rivers could help to manage their water quality. In this study, pollution characteristics, potential nitrogen removal rate, composition and function of bacterial community, and abundance of functional genes associated with nitrogen transformation were comparatively investigated in a typical urban river (FC) and a suburban river (LH). Compared with LH, FC was characterized by higher content of nutrients, lower potential nitrogen removal rate and lower abundance of functional genes associated with nitrogen transformation in both overlying water and sediment, especially in summer. Sediment dissolved organic matter characterized by excitation−emission matrix (EEM) showed that FC was more severely polluted by high nitrogen organic matter. Our results revealed that anammox was the main nitrogen removal pathway in both rivers and potential nitrogen removal rates decreased significantly in summer. Bacterial community analysis showed that the benthic communities were more severely influenced by the pollutant than aquatic ones in both rivers. Furthermore, the FC benthic community was dominated by anaerobic respiring, fermentative, sulfate reduction bacteria. Quantitatively, the denitrification rate showed a significant positive correlation with the abundance of denitrification genes, whilst the anammox rate was significantly negatively correlated with bacterial diversity. Meanwhile, NH 4 +-N had a significant negative correlation to both denitrification and anammox in sediment. Taken together, the results indicated that the increased nitrogen pollutants in an urban river altered nitrogen removal pathways and bacterial communities, which could in turn exacerbate the nitrogen pollution to this river.

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Stepwise pH control to promote synergy of chemical and biological processes for augmenting short-chain fatty acid production from anaerobic sludge fermentation

Cited by 108 publications

References 52 publications

The Mechanism Underlying of Long-Term Stable Indigo Reduction State in Indigo Fermentation Using Sukumo (Composted Polygonum tinctorium Leaves)

The Mechanism Underlying of Long-Term Stable Indigo Reduction State in Indigo Fermentation Using Sukumo (Composted Polygonum tinctorium Leaves)

Selective production of volatile fatty acids at different pH in an anaerobic membrane bioreactor

Insight into the nitrogen accumulation in urban center river from functional genes and bacterial community

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