Anthony Stickland

Optimisation of filter design and operation for wastewater treatment sludge

Publisher: Elsevier BV

Date: 06-2018

DOI: 10.1016/J.SEPPUR.2017.01.070

Comparison of physical characteristics and dewatering behaviour between granular and floccular sludges generated from the same sewage source

Publisher: Elsevier BV

Date: 06-2019

DOI: 10.1016/J.JWPE.2019.100785

Metal–Phenolic Supramolecular Gelation

Publisher: Wiley

Date: 30-09-2016

DOI: 10.1002/ANGE.201608413

Characterising sedimentation velocity of primary waste water solids and effluents

Publisher: Elsevier BV

Date: 07-2022

DOI: 10.1016/J.WATRES.2022.118555

Abstract: Sedimentation in waste water is a heavily studied topic, but mainly focused on hindered and compression settling in secondary sludge, a largely monodispersed solids, where bulk sedimentation velocity is effectively described by functions such as double Vesilind (Takacs). However, many waste water solids, including primary sludge and anaerobic digester effluent are polydispersed, for which application of velocity functions is not well understood. These systems are also subject to large concentration gradients, and poor availability of settling velocity functions has limited design and computational fluid dynamic (CFD) analysis of these units. In this work, we assess the use of various sedimentation functions in single and multi-dimensional domains, comparing model results against multiple batch settling tests at a range of high and low concentrations. Both solids concentration and sludge bed height (interface) over time are measured and compared. The method incorporates uncertainty analysis using Monte Carlo regression, DIRECT ( iding rectangles), and Newton optimisation. It was identified that a double Vesilind (Takacs) model was most effective in the dilute regime ( 1%v/v) without a substantial (50%) decrease in effective maximum sedimentation velocity (V

High Pressure Dewatering Rolls: Comparison of a Novel Prototype to Existing Industrial Technology

Publisher: Elsevier BV

Date: 09-2019

DOI: 10.1016/J.CES.2019.03.080

Shear and solid-liquid separation behaviour of anaerobic digested sludge across a broad range of solids concentrations

Publisher: Elsevier BV

Date: 08-2022

DOI: 10.1016/J.WATRES.2022.118903

Abstract: Due to the non-homogeneous and multiphase nature of anaerobic lagoon constituents, CFD modelling for process optimisation requires continuous functions for shear and solid-liquid separation properties across a large range of solids concentrations. Unfortunately, measurement of existing material properties of anaerobic sludges is limited to only shear or solid-liquid separation, or to a limited solids concentration. In this work, the shear properties of an anaerobic sludge were measured from 0.4 to 12.5 vol%, which corresponds to the solids concentrations seen in lagoons. The sludge showed Newtonian behaviour at 0.4 vol% and Herschel-Bulkley yield stress fluid behaviour for higher concentrations ranging from 0.5 to 12 vol%. We compared multiple approaches to determine relationships between the model fitting parameters of consistency, k, flow index, n, and shear yield stress, τ

Strain softening of concentrated cohesive particulate suspensions prior to yield

Publisher: Society of Rheology

Date: 22-03-2021

DOI: 10.1122/8.0000129

Abstract: We study the viscoelastic solid properties of cohesive particulate suspensions using creep and constant rate tests in a vane-in-large-cup geometry. A cup-to-vane diameter ratio larger than 4 is used to ensure that wall effects are minimized. In both the creep and constant rate tests, the modulus becomes nonlinear at strains consistent with scaled interparticle bond distances. Yielding and subsequent flow do not occur until strains of order 1, corresponding to a cage melting or particle crowding failure mechanism. In between the bond and cage melting strains, the modulus shows power-law softening with an index of approximately −0.8, corresponding to progressive bond breakage. The observed behavior in creep correlates with constant rate experiments and demonstrates that strain softening of the modulus prior to yielding is an important component of the rheology of particulate gels and suspensions. The assumption of linear behavior up to yielding appears to be inappropriate. We observe that the transient creep behavior initially shows power-law or Andrade creep that transforms to an exponential decay at long times. For creep stresses that show time-dependent yield, the break time decreases exponentially with stress.

Agglomeration Regimes of Particles under a Linear Laminar Flow: A Numerical Study

Publisher: MDPI AG

Date: 04-06-2022

DOI: 10.3390/MATH10111931

Abstract: In this work, a combined smoothed particle hydrodynamics and discrete element method (SPH-DEM) model was proposed to model particle agglomeration in a shear flow. The fluid was modeled with the SPH method and the solid particles with DEM. The system was governed by three fundamental dimensionless groups: the Reynolds number Re (1.5~150), which measured the effect of the hydrodynamics the adhesion number Ad (6 × 10−5~6 × 10−3), which measured the inter-particle attraction and the solid fraction α, which measured the concentration of particles. Based on these three dimensionless groups, several agglomeration regimes were found. Within these regimes, the aggregates could have different sizes and shapes that went from long thread-like structures to compact spheroids. The effect of the particle–particle interaction model was also investigated. The results were combined into ‘agglomeration maps’ that allowed for a quick determination of the agglomerate type once α, Re, Ad were known.

Metal-Phenolic Supramolecular Gelation

Publisher: Wiley

Date: 30-09-2016

DOI: 10.1002/ANIE.201608413

Abstract: Materials assembled by coordination interactions between naturally abundant polyphenols and metals are of interest for a wide range of applications, including crystallization, catalysis, and drug delivery. Such an interest has led to the development of thin films with tunable, dynamic properties, however, creating bulk materials remains a challenge. Reported here is a class of metallogels formed by direct gelation between inexpensive, naturally abundant tannic acid and group(IV) metal ions. The metallogels exhibit erse properties, including self-healing and transparency, and can be doped with various materials by in situ co-gelation. The robustness and flexibility, combined with the ease, low cost, and scalability of the coordination-driven assembly process make these metallogels potential candidates for chemical, biomedical, and environmental applications.

A comparison of filtration characterisation devices for compressible suspensions using conventional filtration theory and compressional rheology

Publisher: Elsevier BV

Date: 03-2019

DOI: 10.1016/J.POWTEC.2019.01.056

Linkage Projects - Grant ID: LP120100304

Start Date: 06-2012

End Date: 12-2015

Amount: $210,000.00

Funder: Australian Research Council

Linkage Projects - Grant ID: LP130100395

Start Date: 09-2013

End Date: 12-2016

Amount: $270,000.00

Funder: Australian Research Council

Linkage Projects - Grant ID: LP180100869

Start Date: 08-2020

End Date: 07-2024

Amount: $431,842.00

Funder: Australian Research Council

Linkage Projects - Grant ID: LP170100257

Start Date: 04-2018

End Date: 03-2022

Amount: $315,379.00

Funder: Australian Research Council

ARC Centres Of Excellence - Grant ID: CE200100009

Start Date: 07-2020

End Date: 07-2027

Amount: $35,000,000.00

Funder: Australian Research Council