Agglomerate processing and recycling options in magnetic seeded filtration

Rhein, Frank; Kaiser, S.; Rhein, Michael; Nirschl, Hermann

doi:10.1016/j.ces.2021.116577

Cited by 7 publications

(7 citation statements)

References 20 publications

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“…Agglomerates are either broken up through mechanical stress, or exposed to high temperatures or solvents to extract the non-magnetic component. A previous study ( Rhein et al., 2021 ) showed high recovery rates and low performance losses over the course of multiple separation cycles for three different recycling approaches.…”

Section: Methodsmentioning

confidence: 85%

Separation of Microplastic Particles from Sewage Sludge Extracts Using Magnetic Seeded Filtration

2022

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Section: Methodsmentioning

confidence: 85%

Separation of Microplastic Particles from Sewage Sludge Extracts Using Magnetic Seeded Filtration

2022

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“…Using MSF, Rhein et al achieved a 95% separation efficiency of MPs from dilute suspensions across a wide range of pH values [ 95 ]. Both magnetic and nonmagnetic fractions can be retrieved by the chemical breakup of agglomerates [ 99 ]. Moreover, using hydrophobic seed particles, the MSF approach is a promising purification step that may aid in quantifying MP extracted from complex matrices, such as sewage sludge [ 100 ].…”

Section: Unveiling Microplastics In the Environment: Advances And Cha...mentioning

confidence: 99%

The Microplastics Iceberg: Filling Gaps in Our Understanding

2023

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Plastic is an indispensable material in modern society; however, high production rates combined with inadequate waste management and disposal have resulted in enormous stress on ecosystems. In addition, plastics can become smaller particles known as microplastics (MPs) due to physical, chemical, and biological drivers. MP pollution has become a significant environmental problem affecting terrestrial and aquatic ecosystems worldwide. Although the topic is not entirely new, it is of great importance to the field of polymers, drawing attention to specific gaps in the existing literature, identifying future areas of research, and improving the understanding of MP pollution and its environmental impacts. Despite progress in this field, problems remain. The lack of standardized methods for MP sampling, separation, extraction, and detection makes it difficult to collect information and establish links between studies. In addition, the distribution and pathways of MPs in ecosystems remain unknown because of their heterogeneous nature and the complex matrices in which they occur. Second, toxicological tests showed that MPs can be ingested by a wide range of organisms, such as Danio rerio and Eisenia fetida, resulting in gut obstruction, physical damage, histological changes, and oxidative stress. The uptake of MP and their toxicological effects depend on their shape, size, concentration, and polymer composition. Furthermore, MPs can enter the food chain, raising concerns regarding potential contaminations for human and environmental health. This review paper sheds light on the pressing issue of MP pollution and highlights the need for interdisciplinary collaboration between scientists, policymakers, and industry leaders.

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“…The necessary agglomerate breakup is, e.g., studied via dissolution of the separated component [42,43] via desorption [44] or via mechanical breakup [45]. In a previously published study [46], thermal, chemical, and mechanical breakup were investigated with respect to the recycling rates of both magnetic and nonmagnetic material as well as the functionality of the magnetic seed particles over the course of multiple process cycles. To the authors' best knowledge, this is the most holistic perspective on agglomerate breakup and recycling during MSF.…”

Section: ) Recyclingmentioning

confidence: 99%

Multidimensional Separation by Magnetic Seeded Filtration: Experimental Studies

Rhein,

Zhai,

Schmid

et al. 2023

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The current state of separation technology often neglects the multidimensional nature of real particle systems, which are distributed not only in terms of size, but also in terms of other properties, such as surface charge. Therefore, the aim of this study is to experimentally investigate the applicability of magnetic seeded filtration as a multidimensional separation process. Magnetic seed particles are added to a multisubstance suspension, and a selective heteroagglomeration with the nonmagnetic target particles is induced, allowing for an easy subsequent magnetic separation. The results show that high separation efficiencies can be achieved and that the parameters pH and ionic strength govern the agglomeration process. Selective separation based on surface charge was observed, but undesirable heteroagglomeration processes between the target particles lead to a loss of selectivity. Particle size was clearly identified as a second relevant separation feature, and its partially opposite influence on collision frequency and collision efficiency was discussed. Finally, experimental data of multidimensional separation are presented, in which a size-distributed two-substance suspension is separated into defined size and material fractions in a single process step. This study highlights the need for multidimensional evaluation in general and the potential of magnetic seeded filtration as a promising separation technique.

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Agglomerate processing and recycling options in magnetic seeded filtration

Cited by 7 publications

References 20 publications

Separation of Microplastic Particles from Sewage Sludge Extracts Using Magnetic Seeded Filtration

Separation of Microplastic Particles from Sewage Sludge Extracts Using Magnetic Seeded Filtration

The Microplastics Iceberg: Filling Gaps in Our Understanding

Multidimensional Separation by Magnetic Seeded Filtration: Experimental Studies

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