Estimation of hybrid jig separation efficiency using a modified concentration criterion based on apparent densities of plastic particles with attached bubbles

Ito, Mayumi; Saito, Ayumu; Murase, Nana; Phengsaart, Theerayut; Kimura, Shoko; Kitajima, Naho; Takeuchi, Megumi; Tabelin, Carlito Baltazar; Hiroyoshi, Naoki

doi:10.1007/s10163-020-01090-7

Cited by 17 publications

(16 citation statements)

References 27 publications

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“…where SG AH and SG AL are the SG A of H and L materials, respectively. These CC, CC S , CC R , and CC A have been successfully applied to estimate the separation efficiency of various jig separation of plastics (Ito et al, 2010(Ito et al, , 2020Pita and Castilho, 2016). However, an index to illustrate the possibility of separation for reverse hybrid jig is still not available.…”

Section: Figurementioning

confidence: 99%

“…This water level rise is accurately measured and recorded by a laser-based level sensor (HG-C1050, Panasonic Corporation, Japan) with a floating reflector on top of the water surface. The attached-bubble volume can then be calculated from changes in water level inside the separation chamber before and after bubble introduction (Ito et al, 2020(Ito et al, , 2021.…”

Section: Measurements Of Attached-bubble Volumementioning

confidence: 99%

“…From these purity distribution curves, the sharpness index (SI) could be calculated by Eq. 23 (Ito et al, 2020).…”

Section: Relationship Of Sharpness Index Of Reverse Hybrid Jig Separa...mentioning

confidence: 99%

“…Similarly, for hybrid jig separation, since the apparent specific gravity ( SG A )— SG changed by bubble attachment—affects the separation efficiency more than the inherent SG s of plastics therefore, SG A ( Eq. 20 ) calculated from the inherent specific gravity of materials ( SG P ) and volume of attached bubbles on particles during water pulsation ( V 0 * ) need to be considered ( Ito et al, 2020 ).

…”

Section: Concentration Criteria For Advanced Jig Separationmentioning

confidence: 99%

“…This causes stratification during water pulsation, so the lower SG A (more hydrophobic) plastic is recovered on top while that with higher SG A (more hydrophilic) is recovered at the bottom. The hybrid jig effectively separated various types of mixed-plastics like polyethylene terephthalate (PET)/polyvinyl chloride (PVC) ( Hori et al, 2009b ; Ito et al, 2019a , 2020 ), polypropylene with glass fiber (PPGF)/high impact polystyrene (HIPS) ( Ito et al, 2019b , 2020 ), and PVC/polyamide (nylon-66 or PA) ( Ito et al, 2019b ). Finally, the reverse hybrid jig—a combination of reverse and hybrid jigs—was developed to separate floating plastics having similar SG s like PE/cross-linked polyethylene (XLPE) mixtures ( Ito et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

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Reverse hybrid jig separation efficiency estimation of floating plastics using apparent specific gravity and concentration criterion

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We developed a technique called the reverse hybrid jig, an advanced physical separation technique that combines the principles of jig and flotation to separate floating plastics. This technique is a promising green technology that is more economical and environmentally friendly compared with the conventional flotation. Although the applicability of this technique to separate PP/PE have been reported, the index to illustrate the possibility of separation for the reverse hybrid jig is still not available. In this study, a reverse apparent concentration criterion (CCRA) is proposed to estimate reverse hybrid jig separation efficiency. This modified concentration criterion can be calculated using the specific gravity (SG) of particle with attached bubbles called the apparent specific gravity (SGA). To determine the volume of attached bubbles on plastic surfaces under water pulsation, a laser-assisted apparatus was used under various conditions, including plastic type, air flow rate, dosage, and type of wetting agent. The results of attached bubble volume measurements were used to calculate the SGA and CCRA. The estimated values were then compared with the results of reverse hybrid jig separation. It was found that higher CCRA resulted in better separation efficiency. In addition, an empirical linear equation for estimating the reverse hybrid jig separation efficiency is proposed.

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Section: Figurementioning

confidence: 99%

Section: Measurements Of Attached-bubble Volumementioning

confidence: 99%

“…From these purity distribution curves, the sharpness index (SI) could be calculated by Eq. 23 (Ito et al, 2020).…”

Section: Relationship Of Sharpness Index Of Reverse Hybrid Jig Separa...mentioning

confidence: 99%

…”

Section: Concentration Criteria For Advanced Jig Separationmentioning

confidence: 99%