<i>An Autobiography of the Autobiography of Reading</i>. Dionne Brand. Edmonton, AB: University of Alberta Press, 2020. Pp. vii+52.

Aljoe, Nicole N.

doi:10.1086/719385

Cited by 1 publication

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“…Further optimization is possible, with a recent study from our group indicating that the structure of the flocs may change depending on the addition flow rate of the dual flocculant components. [23] The flocculated sample was then evaluated based on the ISR of the flocs, the CST of the flocs, the turbidity and zeta potential of the supernatant, and the solids content of the sediments. Undiluted MFT samples were evaluated based on the solids content of the sample after filtration and drying.…”

Section: Flocculation Experimentsmentioning

confidence: 99%

Flocculating oil sands tailings with dual anionic/cationic polymers: Dose and charge density effects

Dixon

Soares

2023

Can J Chem Eng

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A two‐step process, with anionic hydrolyzed polyacrylamide (HPAM) and cationic poly(vinylbenzyl trimethylammonium chloride) (PVBTMAC), was used to flocculate oil sands mature fine tailings (MFT). The charge density of HPAM and the dosages of HPAM and PVBTMAC were varied to maximize the dewatering of MFT and minimize the turbidity of the supernatant. The dual flocculant system performed better at lower doses than when used alone. The best HPAM charge density for fast initial settling rate and high sediment solids content was 32%, but it increased to 38% for best sediment dewatering, as measured by capillary suction time. The clearest supernatants were found when the zeta potential approached 0 mV because the cationic PVBTMAC neutralized the surface charges of the particles suspended in the MFT. More importantly, undiluted MFT was flocculated with the HPAM/PVBTMAC system and then filtered at low‐pressure (69 kPag), resulting in a filter cake with a high solids content of 61 wt.%. This study shows that treating MFT with a combination of anionic and cationic polymer is a flexible way to optimize flocculation performance.

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Section: Flocculation Experimentsmentioning

confidence: 99%