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Article

Investigation and Optimization of Chitosan Performance in Flocculating Kaolin Suspensions Using a Real-Time Suspending Solid Concentration Measuring Method

by 1,2, 2, 1,3, 1 and 2,*
1
MCC Capital Engineering and Research Incorporation Ltd., Beijing 100176, China
2
Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
3
School of Environment, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Academic Editor: Rosa Devesa-Rey
Water 2021, 13(4), 513; https://doi.org/10.3390/w13040513
Received: 30 December 2020 / Revised: 11 February 2021 / Accepted: 11 February 2021 / Published: 16 February 2021
The performance of chitosan in flocculating kaolin suspensions was investigated. A real-time suspended solid (SS) concentration measuring method was applied. The influence of pH was examined from 2.0 to 13.0. The optimal pH value for low-grade (100 mg/L), middle-grade (500 mg/L), and high-grade (1000 mg/L) kaolin suspension samples was 8.0. The optimal dosage of chitosan for the three grades of kaolin suspensions was 5.0 mg/L, regardless of the initial SS concentration. An orthogonal array test was performed to determine the optimal hydraulic conditions. Range analysis and variance analysis showed that all four considered factors significantly influenced the flocculation performance of chitosan in the following order: paddle rotation speed in the mixing period > paddle rotation speed in the flocculating period > mixing period time > flocculating period time. Intermittent agitation tests were also performed, showing that alternating agitation and settling enhanced the flocculation performance of chitosan. View Full-Text
Keywords: chitosan; kaolin suspension; flocculation performance; orthogonal array test; hydraulic conditions; intermittent agitation chitosan; kaolin suspension; flocculation performance; orthogonal array test; hydraulic conditions; intermittent agitation
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MDPI and ACS Style

Xu, Y.; Gan, K.; Liang, S.; Liu, H.; Wang, Q. Investigation and Optimization of Chitosan Performance in Flocculating Kaolin Suspensions Using a Real-Time Suspending Solid Concentration Measuring Method. Water 2021, 13, 513. https://doi.org/10.3390/w13040513

AMA Style

Xu Y, Gan K, Liang S, Liu H, Wang Q. Investigation and Optimization of Chitosan Performance in Flocculating Kaolin Suspensions Using a Real-Time Suspending Solid Concentration Measuring Method. Water. 2021; 13(4):513. https://doi.org/10.3390/w13040513

Chicago/Turabian Style

Xu, Yan, Kemin Gan, Siyi Liang, Haitao Liu, and Qunhui Wang. 2021. "Investigation and Optimization of Chitosan Performance in Flocculating Kaolin Suspensions Using a Real-Time Suspending Solid Concentration Measuring Method" Water 13, no. 4: 513. https://doi.org/10.3390/w13040513

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