Induced Crystallization Softening and Desalination of Effluent from Mine Water Membrane Concentration
After undergoing multistage membrane system treatment,a considerable amount of membrane concentrate generated from mine water membrane concentration possesses the characteristics of high salinity,a variety of ions,and the presence of scale inhibitors.The method of calcium sulfate induced crystallization was employed to undertake a static test study.The induced crystal seeds were added to the water samples in advance,enabling Ca2+and SO42-to form CaSO4 crystals and adhere to the surface of the crystal seeds,thereby achieving softening and desalination of the concentrate.This method could achieve better removal results.The removal efficiency of Ca2+in calcium sulfate unsaturated raw water could reach 49.37％,while the removal efficiency of Ca2+in calcium sulfate supersaturated raw water could amount to 40.46％,and the removal efficiency of SO42-could stand at 26.53％.The supersaturation of CaSO4 in water,the type and dosage of induced crystal species,the pH of the solution,the stirring intensity,and the stirring time were the main factors influencing the crystallization performance.The SEM analysis results of the crystal seed surface indicated that crystals were produced during the experiment and effectively adhered to its surface,and the EDS analysis demonstrated that the crystals were mainly composed of Ca2+and SO42-compounds.
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