Effect of permanent magnetic field on scale inhibition property of circulating water
| Autor: | Xiayan Yao, Fengman Shen, Jiang Lili, Haitao Yu, Xingang Hou, Zongshu Zou, Chuantong Li |
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| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Analytical chemistry Wastewater engineering.material 010402 general chemistry Waste Disposal Fluid 01 natural sciences Calcium Carbonate chemistry.chemical_compound Nuclear magnetic resonance X-Ray Diffraction Electrical resistivity and conductivity Vaterite 0103 physical sciences Water Movements Magnesium Water Science and Technology 010302 applied physics Calcite Chemistry Aragonite Temperature Water Hydrogen Bonding equipment and supplies 0104 chemical sciences Magnetic field Magnetic Fields Calcium carbonate Flow velocity Magnet engineering human activities |
| Zdroj: | Water Science and Technology. 76:1981-1991 |
| ISSN: | 1996-9732 0273-1223 |
| Popis: | Effect of a permanent magnet field on the scale inhibition property of circulating water was investigated. Orthogonal experiments of L16(45) were performed and analyzed using the range analysis method. The operating parameters included magnetic field intensity, initial concentration of Ca2+ and Mg2+, magnetic treatment time, temperature, and flow velocity. Scale inhibition rate, hardness, relative variation in the proportion of free water molecules, electrical conductivity, and relative variation of molecular energy were chosen as the objectives. In addition, the morphology and the composition of CaCO3 and MgCO3 scale were studied by X-ray diffraction analysis. The optimal conditions were initial concentration of 900 mg/L, magnetic field intensity of 0.5 T, temperature of 303 K, time of 54 h and flow velocity of 0.17 m/s. The nuclear magnetic resonance results demonstrated that the number of hydrogen bonds increased between water molecules and hydrated ions. The magnetic field can promote the increase in the number of hydrogen bonds, which can inhibit the formation of calcium and magnesium carbonate precipitation. Moreover, the ratio of calcite, aragonite and vaterite will be changed at different magnetic field intensities, and the aragonite ratio will reach the peak at the optimum conditions. |
| Databáze: | OpenAIRE |
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