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Membrane performance in the treatment of the effluent from a zirconium silicate production industry

Pindea A., Sancho M., Lora J., Arnal J. M., Bes A., Marti C.

Environment Protection Engineering

2005

Vol. 31, nr 3-4

177-186

Zirconium silicate sands are produced by different branches of industry for several applications in the ceramic industry. This production can be made by different milling processes: dry milling and wet milling. The wet milling yields a smaller particle size. This is a great yield process which implies more stages: addition and removal of water, sedimentation, and addition of alumina (Al2O3), NaOH and a coagulant, generally a polyelectrolyte, which are used to control the process and the quality of the wastewater. Polyelectrolyte allows formation of flocs for the separation of zirconium silicate solids from the water. This experimental study was made with two main purposes: 1) to reuse the polyelectrolyte in the process of coagulation and 2) to reuse the water in the milling process, therefore reducing the amount of wastewater. As a result, some environmental benefits will be obtained: reuse of the water and better quality of the wastewater; and also economical benefits: saving of polyelectrolyte and water, and greater yield in the production process. Membrane technologies are suitable for the removal of suspended solids and organic compounds, like a polyelectrolyte, from water. Some experimental tests were carried out in a pilot-plant scale in order to assess the viability of different membrane processes in the treatment of the effluent from a zirconium silicate production industry. This work presents the results of membrane performance obtained in these experiments.