Stability of adsorber resins under mechanical compression and ultrasonication

Breitbach, Marc; Bathen, Dieter; Schmidt–Traub, H.; Ebener, H.

doi:10.1002/pat.203

Cited by 8 publications

(7 citation statements)

References 13 publications

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“…The resin is in the form of chemical inert rigid spheres, which are wet sieved to particle sizes between 630 and 800 μm in these studies. Preliminary tests had shown that the resin does not get damaged by ultrasound of the applied frequencies …”

Section: Methodsmentioning

confidence: 99%

Effect of Ultrasound on Adsorption and Desorption Processes

Breitbach

Bathen

Schmidt–Traub

2003

Ind. Eng. Chem. Res.

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The following paper is aimed at finding the effects of ultrasound on adsorption/desorption processes. Experiments concerning the ultrasonic power input indicate that particles absorb ultrasonic energy effectively if they are in resonance with the ultrasound. The ultrasonic energy is dissipated into heat. Hence, desorption processes are promoted. Desorption experiments at different frequencies show that neither particle oscillations nor cavitation effects are responsible for ultrasonically enhanced desorption processes for an adsorption system with surface diffusion as the rate-limiting step. Measured ultrasonic power distributions show that the ultrasonic field inside the adsorber is very inhomogeneous. With the temperature distribution inside the adsorber, the courses of concentration of ultrasonically enhanced desorption experiments can be explained by a hot-water desorption model. Thus, simulations substantiate the experimental results that thermal effects are responsible for ultrasonically enhanced desorption with the applied adsorption system.

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Section: Methodsmentioning

confidence: 99%

Effect of Ultrasound on Adsorption and Desorption Processes

Breitbach

Bathen

Schmidt–Traub

2003

Ind. Eng. Chem. Res.

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“…The final data point indicates the total amount of product associated with the spent resin after its complete saturation with epothilone D. The total binding capacity of the resins for additional epothilone is highly dependent upon the nature of the production strain and process. Error bars indicate the standard deviation of each triplicate data set values for a single resin bead [2]. The XAD-16 resin was found to be the least ductile and most prone to fracture of the various resin types tested.…”

Section: Fracture Of Product Adsorption Resin During a Microbial Cultmentioning

confidence: 98%

“…A compression force of 1 N was required to fracture a representative XAD-16 resin bead under loading, while some of the other resin beads were able to withstand compression forces seven times higher. The polystyrene XAD-16 resin beads deform under a compression load by almost 25% of the bead diameter before fracture occurs [2], or by about 150 lm for an average bead. The threshold amount of work required over this deformation distance for a resin bead to fracture from a single impact is approximately 1.5·10 4 g cm 2 /s 2 , about six orders of magnitude higher than the actual bead-bead collision energy at an agitation rate of 800 rpm.…”

Section: Fracture Of Product Adsorption Resin During a Microbial Cultmentioning

confidence: 99%

Characterization of product capture resin during microbial cultivations

Frykman¹,

Tsuruta²,

Galazzo³

et al. 2006

J IND MICROBIOL BIOTECHNOL

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Various bioactive small molecules produced by microbial cultivation are degraded in the culture broth or may repress the formation of additional product. The inclusion of hydrophobic adsorber resin beads to capture these products in situ and remove them from the culture broth can reduce or prevent this degradation and repression. These product capture beads are often subjected to a dynamic and stressful microenvironment for a long cultivation time, affecting their physical structure and performance. Impact and collision forces can result in the fracturing of these beads into smaller pieces, which are difficult to recover at the end of a cultivation run. Various contaminating compounds may also bind in a non-specific manner to these beads, reducing the binding capacity of the resin for the product of interest (fouling). This study characterizes resin bead binding capacity (to monitor bead fouling), and resin bead volume distributions (to monitor bead fracture) for an XAD-16 adsorber resin used to capture epothilone produced during myxobacterial cultivations. Resin fouling was found to reduce the product binding capacity of the adsorber resin by 25-50%. Additionally, the degree of resin bead fracture was found to be dependent on the cultivation length and the impeller rotation rate. Microbial cultivations and harvesting processes should be designed in such a way to minimize bead fragmentation and fouling during cultivation to maximize the amount of resin and associated product harvested at the end of a run.

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“…These artificial soils (each 20 g) were stored in 100 mL of 1.6 g cm −3 dense SPT solution for 1 h in 200 mL PE bottles, which did not show measurable release of plastic fragments due to sonication in preliminary tests with a pure fine sand matrix (data not shown). Mechanical stress was applied by use of a sonotrode (Branson© Sonifier 250) as described by Büks and Kaupenjohann (2016). The sonication times corresponding to 0, 10, 50, 100 and 500 J mL −1 were determined by means of the sonotrode's energy output calculated following North (1976).…”

Section: Mechanical Stress Treatmentmentioning

confidence: 99%

“…The mechanical disintegration of soil aggregates by use of ultrasonication following the method of Edwards and Bremner (1967a) and subsequent density fractionation of particulate organic matter is widely used in the assessment of soil organic matter (SOM) stability. This includes characteristics such as aggregate composition and stability (Edwards and Bremner, 1967b), the constitution of SOM pools (Golchin et al, 1994), the stabilization of SOM in forest ecosystems (Graf-Rosenfellner et al, 2016) and the occlusive strength of particulate organic matter (POM) (Büks and Kaupenjohann, 2016). Ultrasonication is also applied to assess quantities and qualities of anthropogenic contaminants such as microplastics (Zhang and Liu, 2018;.…”

Section: Introductionmentioning

confidence: 99%

Particles under stress: ultrasonication causes size and recovery rate artifacts with soil-derived POM but not with microplastics

et al. 2021

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Abstract. The breakdown of soil aggregates and the extraction of particulate organic matter (POM) by ultrasonication and density fractionation is a method widely used in soil organic matter (SOM) analyses. It has recently also been used for the extraction of microplastic from soil samples. However, the investigation of POM physiochemical properties and ecological functions might be biased if particles are comminuted during the treatment. In this work, different types of POM, which are representative of different terrestrial ecosystems and anthropogenic influences, were tested for their structural stability in the face of ultrasonication in the range of 0 to 500 J mL−1. The occluded particulate organic matter (oPOM) of an agricultural and forest soil as well as pyrochar showed a significant reduction of particle size at ≥50 J mL−1 by an average factor of 1.37±0.16 and a concurrent reduction of recovery rates by an average of 21.7±10.7 % when being extracted. Our results imply that increasing ultrasonication causes increasing retention of POM within the sedimenting phase, leading to a misinterpretation of certain POM fractions as more strongly bound oPOM or part of the mineral-associated organic matter (MOM). This could, for example, lead to a false estimation of physical stabilization. In contrast, neither fresh nor weathered polyethylene (PE), polyethylene terephthalate (PET) and polybutylene adipate terephthalate (PBAT) microplastics showed a reduction of particle size or the recovery rate after application of ultrasound. We conclude that ultrasonication applied to soils has no impact on microplastic size distribution and thus provides a valuable tool for the assessment of microplastics in soils and soil aggregates.

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Stability of adsorber resins under mechanical compression and ultrasonication

Cited by 8 publications

References 13 publications

Effect of Ultrasound on Adsorption and Desorption Processes

Effect of Ultrasound on Adsorption and Desorption Processes

Characterization of product capture resin during microbial cultivations

Particles under stress: ultrasonication causes size and recovery rate artifacts with soil-derived POM but not with microplastics

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