Next Article in Journal
Fast Cylinder Shape Matching Using Random Sample Consensus in Large Scale Point Cloud
Next Article in Special Issue
Methods for Sampling Biogas and Biomethane on Adsorbent Tubes after Collection in Gas Bags
Previous Article in Journal
Strength and Water Purification Properties of Environment-Friendly Construction Material Produced with the (D)PAOs and Zeolite
Previous Article in Special Issue
Optimal Depressants and Collector Dosage in Fluorite Flotation Process Based on DoE Methodology
Open AccessArticle

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

Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(5), 973;
Received: 29 December 2018 / Revised: 15 February 2019 / Accepted: 27 February 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Techniques for Sustainable Processing of Natural Resources)
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. The floc formation process was mainly carried out in a rapid mixer; a rapid mixing speed of 300 rpm was chosen according to zeta potential and removal efficiency. Reducing retention time caused a relatively small floc size in all reactors. When influent flow was 30 L/h (retention time of 2 min in rapid mixer), the average floc size reached 8.06 μm in a rapid mixer; through breakage and re-growth, the floc size remained stable in the flocculation basin. After growth, the final floc size reached 11.21 μm in a sedimentation tank. The removal efficiency of reactive orange is 89% in the magnesium hydroxide coagulation process. View Full-Text
Keywords: magnesium hydroxide; reactive orange; mixing; coagulation; floc size magnesium hydroxide; reactive orange; mixing; coagulation; floc size
Show Figures

Graphical abstract

MDPI and ACS Style

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop