Influence of thermophilic aerobic digestion as a sludge pre-treatment and solids retention time of mesophilic anaerobic digestion on the methane production, sludge digestion and microbial communities in a sequential digestion process

Jang, Hyun Min; Cho, Hyun Uk; Park, Soo Young; Ha, Jeong Hyub; Park, Jong

doi:10.1016/j.watres.2013.06.041

Cited by 124 publications

(46 citation statements)

References 60 publications

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“…Chemical treatment requires large amounts of chemicals to maintain the reaction conditions. In addition, inhibitory and biologically non-degradable compounds can be generated after thermal and chemical treatment (Jang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

The thermophilic (55°C) microaerobic pretreatment of corn straw for anaerobic digestion

Wang

Yuan

et al. 2015

Bioresource Technology

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Section: Introductionmentioning

confidence: 99%

The thermophilic (55°C) microaerobic pretreatment of corn straw for anaerobic digestion

Wang

Yuan

et al. 2015

Bioresource Technology

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“…was the observed dominant band during the composting of S-sludge (a high concentration of proteins). Jang et al (2014) also used PCR-DGGE to study the microbial community of sludge thermophilic aerobic digestion as a sludge pre-treatment for mesophilic anaerobic digestion, and they found that Ureibacillus thermophiles and Bacterium thermus were the major contributors to the increase in soluble organic matter. Ureibacillus sp.…”

Section: Evolution Of Dom In Sludge Bio-dryingmentioning

confidence: 99%

Effects of aeration strategy on the evolution of dissolved organic matter (DOM) and microbial community structure during sludge bio-drying

Zhang

Cai

et al. 2015

Appl Microbiol Biotechnol

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Sludge bio-drying in which sludge is dried by means of the heat generated by the aerobic degradation of its own organic substances has been widely used for sludge treatment. A better understanding of the evolution of dissolved organic matter (DOM) and its degradation drivers during sludge bio-drying could facilitate its control. Aeration is one of the key factors that affect sludge bio-drying performance. In this study, two aeration strategies (pile I-the optimized and pile II-the current) were established to investigate their impacts on the evolution of DOM and the microbial community in a full-scale sludge bio-drying plant. A higher pile temperature in pile I caused pile I to enter the DOM and microbiology stable stage approximately2 days earlier than pile II. The degradation of easily degradable components in the DOM primarily occurred in the thermophilic phase; after that degradation, the DOM components changed a little. Along with the evolution of the DOM, its main degradation driver, the microbial community, changed considerably. Phyla Firmicutes and Proteobacteria were dominant in the thermophilic stage, and genus Ureibacillus, which was the primary thermophilic bacteria, was closely associated with the degradation of the DOM. In the mesophilic stage, the microbial community changed significantly at first and subsequently stabilized, and the genus Parapedobacter, which belongs to Bacteriodetes, became dominant. This study elucidates the interplay between the DOM and microbial community during sludge bio-drying.

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“…It was nearly half a century later that expansion to higher volume fractions of the secondary phase gained the attention of numerous researchers. [16][17][18][19][20][21][22][23][24][25] Of these, the Einstein-Roscoe relationship shown in (Eq. (8)) 26) is considered to be one of the most applicable models.…”

Section: Empirical Modeling Of Slag Foam Viscositymentioning

confidence: 99%

Rheological Behavior and Empirical Model of Simulated Foaming Slag

et al. 2014

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The slags and fluxes found in modern steelmaking convertors all contain finely dispersed gas phases, which are generated by the refining reaction used to decarburize the molten iron. The frothing effect that is often generated as a result of these gasses can often prove to be a fatal obstacle in the efficient operation of the converter. In the present study, a simulated slag foam was produced by dispersing N2 bubbles in silicone oil. The effect of varying the volume fraction and bubble size of the dispersed gas phase, the shear rate, and the viscosity of the liquid phase, was then systematically investigated by measuring the viscosity of the N2 bubble dispersed silicone oil with a rotating viscometer. This found that the relative viscosity is increased as the volume fraction of the gas phase is increased, ultimately transitioning from a Newtonian to pseudo-plastic fluid at higher gas phase rates. In addition, an empirical model for the viscosity of the slag foam was developed by modifying the Einstein-Roscoe equation, with this model capable of reproducing the variation in relative viscosity with various gas phase rates, shear rates, and bubble sizes.

show abstract

Influence of thermophilic aerobic digestion as a sludge pre-treatment and solids retention time of mesophilic anaerobic digestion on the methane production, sludge digestion and microbial communities in a sequential digestion process

Cited by 124 publications

References 60 publications

The thermophilic (55°C) microaerobic pretreatment of corn straw for anaerobic digestion

The thermophilic (55°C) microaerobic pretreatment of corn straw for anaerobic digestion

Effects of aeration strategy on the evolution of dissolved organic matter (DOM) and microbial community structure during sludge bio-drying

Rheological Behavior and Empirical Model of Simulated Foaming Slag

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