Impact of rheological properties of substrate on anaerobic digestion and digestate dewaterability: New insights through rheological and physico-chemical interaction

Miryahyaei, S.; Olinga, K.; Muthalib, Farihin Abdul; Das, Tanmoy; Aziz, Marya; Othman, Maazuza; Baudez, Jean-Christophe; Batstone, Damien J.; Eshtiaghi, Nicky

doi:10.1016/j.watres.2018.11.049

Cited by 49 publications

(9 citation statements)

References 39 publications

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“…Compared with the study of sludge EPS, using rheological analysis can provide a new perspective to reveal the hydrodynamic of solid–liquid separation for the sludge dewatering process, which enables the fundamental understanding of sludge management. In fact, previous studies have noted that the rheological properties of sludge correlate well with the quantities of EPS and physic-chemic properties of sludge; , it would be interesting to explore the usage of rheological analysis to unravel the dewatering mechanism and optimize the conditioning process in the future.…”

Section: Resultsmentioning

confidence: 99%

Supplementary In-Depth Analysis of the Waste Activated Sludge Dewatering Process Using a Rheological Analysis

et al. 2020

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Much research has been conducted to improve sludge dewaterability and reveal its dewatering process. However, to date, two key issues remain unsolved: (1) the difficulty of dewatering sludge and (2) why suitable chemical conditioning can improve sludge dewaterability. This study is focused on addressing these two problems using a rheological analysis. Flow and dynamic measurements were performed to investigate the rheological properties of three types of sludge samples (raw sludge, acid-conditioned sludge, and Fenton-conditioned sludge) with different dewatering performances and a total solid content (TS) range of 20−62 g/L (2−6.2 wt %). The measured data were fitted to predict the rheological behaviors of the sludge at moderate and high TS values (15−50 wt %). A horizontal analysis and comparison of the rheological characteristics of the sludge samples indicated that rheological properties of the sludge exhibited a strong dependence on the solids content of the raw and treated sludge. An increase in the solids content significantly strengthened the solid-like properties and increased the deformation resistance, causing the sludge to become more resistant to flow and resulting in lower flowability of the sludge system; this provided an explanation for the difficulty in sludge dewatering. A vertical comparison and analysis of the rheological behavior of the sludge samples addressed the second key issue and indicated that a suitable conditioning method such as acid and Fenton oxidation conditioning had positive effects on the evolution of the rheological parameters of the sludge; namely, the conditioning resulted in weaker viscoelastic properties and better flowability. These results provide insights into the fundamental mechanism of sludge dewatering through rheological analysis.

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Section: Resultsmentioning

confidence: 99%

Supplementary In-Depth Analysis of the Waste Activated Sludge Dewatering Process Using a Rheological Analysis

et al. 2020

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“…An Accumet probe was used to measure the pH of all samples. NH 3 -N was measured using the salicylate method (HACH, method 10031) as utilized in many studies in the literature measuring NH 3 -N concentrations in landfill leachate. ,− COD was measured using the reactor digestion with the potassium dichromate method (HACH, method 8000). All HACH methods utilized a DR 3900 spectrophotometer for spectrophotometric analysis, and all methods are found in the Water Analysis Handbook .…”

Section: Methodsmentioning

confidence: 99%

Effect of Loading Frequency on Ammonia-Nitrogen Removal Kinetics in Early-Stage Pilot-Scale Vertical Flow Constructed Wetlands Treating Landfill Leachate

et al. 2023

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This study measured the effects of loading frequency and plant species on the removal of ammonia-nitrogen (NH3-N) in a vertical flow constructed wetland (VFCW). Eight pilot-scale VFCW columns were constructed for this experiment; half of the columns were planted with Typha latifolia and the other half Scirpus californicus. To test the effect of loading frequency, half of the columns for each plant species were fed diluted leachate over the course of 24 h, and the other half were fed diluted leachate over the course of 8 h. This study was conducted in the early stages of plant and biofilm development within the system. Removal of chemical oxygen demand (COD) was observed but inconsistent, as was denitrification. Average NH3-N removal efficiencies in the various configurations ranged from 39.4 to 55.1%, and all configurations experienced peak removal efficiencies at a 1:20 dilution of leachate. Columns planted with T. latifolia and fed over 24 h performed significantly better than those planted with S. Californicus; this effect was not observed for columns fed over 8 h. Of the four configurations, columns planted with T. latifolia and fed over the course of 24 h performed best. The mechanisms responsible for this deserve further study.

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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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Impact of rheological properties of substrate on anaerobic digestion and digestate dewaterability: New insights through rheological and physico-chemical interaction

Abstract: Impact of rheological properties of substrate on anaerobic digestion and digestate dewaterability: New insights through rheological and physico-chemical interaction, Water Research,

Cited by 49 publications

References 39 publications

Supplementary In-Depth Analysis of the Waste Activated Sludge Dewatering Process Using a Rheological Analysis

Supplementary In-Depth Analysis of the Waste Activated Sludge Dewatering Process Using a Rheological Analysis

Effect of Loading Frequency on Ammonia-Nitrogen Removal Kinetics in Early-Stage Pilot-Scale Vertical Flow Constructed Wetlands Treating Landfill Leachate

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

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