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Flocculation and dewatering of the Kaolin slurry treated by single- and dual-polymer flocculants by Shanlin Xu; Junqiang Shi; Jing Deng; Honglei Sun; Jiawei Wu; Zhaohui Ye is a Environmental Science article available to read on EtoBox.

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To mitigate the sudden increase in the production of waste engineering slurry, predominantly composed of Kaolinite, this study investigated the flocculation and dewatering of Kaolin slurry treated with single- and dual-polymer flocculants. The influence of the flocculant type and dosage, under single- and dual-dose conditions, on slurry's sedimentation and the filtration characteristics, were thoroughly discussed. The results reveal that the adsorption bridging of the polymeric flocculant, resulting from hydrogen bonds, exerts a more significant effect than electrical neutralization on forming a large floc. Under single-dose conditions, nonionic polyacrylamides (NPAMs) with the strongest adsorption bridging leads to biggest flocs and the maximum settling rate of 21.55 mm/s. Under the dual-dose conditions of polymeric aluminium chloride (PAC) and PAM, the size of the slurry's floc decreases with an increase in PAC dosage. Nevertheless, the filtration performance of the slurry improves, with the lowest SRF value of the flocculated slurry being 1.58 × 1011 m/kg as 3‰ PAC and 3‰ NPAM is dosed. The improvement is explained by the micro-pore distribution of sludge. According to Mercury i

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Author

Shanlin Xu; Junqiang Shi; Jing Deng; Honglei Sun; Jiawei Wu; Zhaohui Ye

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)