Unveiling the mechanisms of how cationic polyacrylamide affects short-chain fatty acids accumulation during long-term anaerobic fermentation of waste activated sludge

Liu, Xuran; Xu, Qiuxiang; Wang, Dongbo; Wu, Yanxin; Yang, Qi; Liu, Yiwen; Wang, Qilin; Li, Xiaoming; Li, Hailong; Zeng, Guangming; Yang, Guojing

doi:10.1016/j.watres.2019.02.036

Cited by 190 publications

(48 citation statements)

References 50 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: 83%

“…Hydrolysis refers to the hydrolysis of organic matter into small molecular substances. For example, glucan is converted to glucose and proteins are converted to amino acids [48]. According to the content of hydrolyzed protein and polysaccharide in the reaction system, the degree of material hydrolysis in the reaction system was judged.…”

Section: E Effect Of Dehp On Hydrolysis Acidogenesis Acetogenesis mentioning

confidence: 99%

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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: 83%

Section: E Effect Of Dehp On Hydrolysis Acidogenesis Acetogenesis mentioning

confidence: 99%

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 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: 94%

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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“…Disintegrative treatment methods of sewage sludges belong currently to the most dynamically developing technologies. They concern mainly the possibility of reducing the amount of sludge discharged from sewage treatment plants (Liu et al 2016; Machnicka and Grübel 2016) and improvement of susceptibility of the sludge into a biochemical decomposition (Kardos et al 2011; Wacławek et al 2016; Liu et al 2019). Disintegration is a process of destroying the structure of the sludge, which involves fragmenting of flocs, destruction of cells of microorganisms and releasing organic substances, inorganic substances and extracellular polymers into the supernatant of the sludge (Yu et al 2008; Grübel et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Waste-activated sludge disruption by dry ice: bench scale study and evaluation of heat phase transformations

Machnicka

Grűbel

Sikora

2019

Environ Sci Pollut Res

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The freezing process consists of dissipating heat from the product until the final temperature is lower than the temperature of crystallisation of that product. Freezing can be used for numerous applications, including for disruption of waste-activated sludge (WAS). The aim of this study was to calculate the estimated amount of heat conveyed between the solidified carbon dioxide and the WAS, in the following ratios: 0.25:1; 0.5:1; 0.75:1 and 1:1. In heat of phase transformations, dry ice sublimation, water solidification, the amount of heat transferred by other substances and heat transferred from the sludge (dry sludge) were taken into account during the process of WAS freezing. Heat changes on the surface of WAS were registered using a thermovision camera. The effectiveness of WAS disintegration was confirmed by several biochemical parameters such as soluble chemical oxygen demand (increase over 14 times), degree of disintegration (48%), proteins (increase over 5 times), carbohydrates (increase almost 7 times), RNA (increase by 2.23 mg L−1), ammonia nitrogen (increase over 23 times), phosphates (increase almost 27 times) and turbidity (increased over 7 times). It was found that dry ice pretreatment of WAS can be an intriguing alternative for the conventional methods used.Electronic supplementary materialThe online version of this article (10.1007/s11356-019-05889-2) contains supplementary material, which is available to authorized users.

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Unveiling the mechanisms of how cationic polyacrylamide affects short-chain fatty acids accumulation during long-term anaerobic fermentation of waste activated sludge

Cited by 190 publications

References 50 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

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

Waste-activated sludge disruption by dry ice: bench scale study and evaluation of heat phase transformations

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