Rheological measurements as indicators for hydrolysis rate, organic matter removal, and dewaterability of digestate in anaerobic digesters

Miryahyaei, S.; Olinga, K.; Ayub, M. Sh.; Jayaratna, Sh. Sh.; Othman, Maazuza; Eshtiaghi, Nicky

doi:10.1016/j.jece.2020.103970

Cited by 18 publications

(6 citation statements)

References 42 publications

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“…By multiple linear regression, a statistical model to predict hydrolysis until the time of greatest sCOD enhancement by changes of the flow consistency index was build and tested with less than 5% error for sludges of different origin, TS and feed to inoculum ratio. This correlation as well as models found for VS degradation and sludge dewaterability could be used to monitor the hydrolysis stage [67]. Similarly, the impact of thermal treatment on the rheology of digested sludge and WAS was evaluated and resulted in a linear relationship between soluble COD and rheological properties [70,71].…”

Section: Measurement Of Hydrolysis Efficiencymentioning

confidence: 92%

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Role of Microbial Hydrolysis in Anaerobic Digestion

2020

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There is a growing need of substrate flexibility for biobased production of energy and value-added products that allows the application of variable biodegradable residues within a circular economy. It can be used to balance fluctuating energy provision of other renewable sources. Hydrolysis presents one of the biggest limitations during anaerobic digestion. Methods to improve it will result in broader process applicability and improved integration into regional material cycles. Recently, one focus of anaerobic digestion research has been directed to systems with a separate hydrolysis–acidogenesis stage as it might be promised to improve process performance. Conditions can be adjusted to each class of microorganisms individually without harming methanogenic microorganisms. Extensive research of separate biomass pretreatment via biological, chemical, physical or mixed methods has been conducted. Nevertheless, several methods lack economic efficiency, have a high environmental impact or focus on specific substrates. Pretreatment via a separate hydrolysis stage as cell-driven biotransformation in a suspension might be an alternative that enables high yields, flexible feeding and production, and a better process control. In this review, we summarize existing technologies for microbial hydrolytic biotransformation in a separate reactor stage and the impacts of substrate, operational parameters, combined methods and process design as well as remaining challenges.

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Section: Measurement Of Hydrolysis Efficiencymentioning

confidence: 92%

“…And DOC TOC initial (2) from [44]. Or by using mass balances of suspended carbon or COD for the hydrolysis stage [17,27,36,67]. As hydrolysis efficiency is not a standard parameter for process evaluation in AD, there does not seem to be a preferred method yet.…”

Section: Measurement Of Hydrolysis Efficiencymentioning

confidence: 99%

Role of Microbial Hydrolysis in Anaerobic Digestion

2020

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“… [ 35 , 132 ] Rheological properties of the inoculum-FW mixture The amount of substrate and inoculum added to the reactor generates changes in the rheological properties of the mixture, so characterizing the mixture under different conditions of S/I ratios is an aspect to investigate that takes on greater importance in psychrophilic conditions where the rheological properties are more affected. [ 158 , 175 , 176 ] …”

Section: Strategies To Improve the Anaerobic Digestion Of Food Waste ...mentioning

confidence: 99%

Research trends and strategies for the improvement of anaerobic digestion of food waste in psychrophilic temperatures conditions

Rodríguez-Jiménez

Pérez-Vidal

Torres–Lozada

2022

Heliyon

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“…Gas-liquid stirred tanks are required to reach a wider range of process objectives, such as fermentation, dispersion, oxidation, hydrogenation, and other kinds of processes [3,4]. The effective achievement of a gasliquid stirred tank affects the degree of gas-liquid homogenization, mixing quality, power consumption, and mass transfer, which will determine the reactions involved in relevant processes [5]. The solubility of air in wastewater is low, making oxygen transfer rate an important entity.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Spargers Design on the Wastewater Treatment of Gas-Liquid Dispersion Process in a Stirred Tank

Zheng

Wang

et al. 2022

Entropy

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The hydrodynamic and power characteristics of curved Rushton impeller in an air-wastewater system were investigated using the CFD-PBM method. Studies were conducted primarily in a mixing vessel of diameter 0.39 m. The inference of operating conditions, sparger distribution, and numbers on bulk flow patterns, gas-filled cavity formation, and power consumption have been investigated in detail. It found that the gassed power consumption is closely related to cavity shape and flow patterns. In particular, the development of large cavities causes a significant reduction in power drawn, impeller pumping capacity, and gas dispersion capability. The sparger distribution and location have a strong influence on relative power drawn, power required to disperse gas, and stability of operation. Of the sparger configurations studied, the use of three sparger distributions is suggested, since relative power drawn, gas dispersion capability, and flow patterns in dispersing gas are all enhanced.

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Rheological measurements as indicators for hydrolysis rate, organic matter removal, and dewaterability of digestate in anaerobic digesters

Cited by 18 publications

References 42 publications

Role of Microbial Hydrolysis in Anaerobic Digestion

Role of Microbial Hydrolysis in Anaerobic Digestion

Research trends and strategies for the improvement of anaerobic digestion of food waste in psychrophilic temperatures conditions

The Effect of the Spargers Design on the Wastewater Treatment of Gas-Liquid Dispersion Process in a Stirred Tank

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