Preprint Article Version 1 This version is not peer-reviewed

Effects of Mixing Conditions on Floc Properties in Magnesium Hydroxide Continuous Coagulation Process

Version 1 : Received: 29 January 2019 / Approved: 30 January 2019 / Online: 30 January 2019 (10:14:59 CET)

A peer-reviewed article of this Preprint also exists.

Ding, Y.; Zhao, J.; Wei, L.; Li, W.; Chi, Y. Effects of Mixing Conditions on Floc Properties in Magnesium Hydroxide Continuous Coagulation Process. Appl. Sci. 2019, 9, 973. Ding, Y.; Zhao, J.; Wei, L.; Li, W.; Chi, Y. Effects of Mixing Conditions on Floc Properties in Magnesium Hydroxide Continuous Coagulation Process. Appl. Sci. 2019, 9, 973.

Journal reference: Appl. Sci. 2019, 9, 973
DOI: 10.3390/app9050973

Abstract

Magnesium hydroxide continuous coagulation process was used for treating simulated reactive orange wastewater in this study. Effects of mixing conditions and retention time on the coagulation performance and floc properties of magnesium hydroxide were based on the floc size distribution (FSD), zeta potential and floc morphology analysis. Floc formation and growth in different reactors were also discussed.The results showed that increasing rapid mixing speed led to a decrease in the final floc size. Floc formation process was mainly carried out in rapid mixer, rapid mixing speed of 300rpm was chosen according to zeta potential and removal efficiency. Reducing retention time caused relatively small floc size in all reactors. When influent flow is 30 L/h (retention time of 2min in rapid mixer), the average floc size reached 8.06μm in rapid mixer, through breakage and re-growth, the floc size remained stable in flocculation basin. After growth, the final floc size reached to 11.21μm in sedimentation tank. The removal efficiency of reactive orange is 89% in magnesium hydroxide coagulation process.

Subject Areas

magnesium hydroxide; reactive orange; mixing; coagulation; floc size

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