北京地热开采中的尾水氟处理方法

    Research on method of processing tail water in geothermal exploration in Beijing

    • 摘要: 釆用猪骨灰型羟基磷灰石、蜂窝煤灰和赤铁矿进行吸附除氟实验,猪骨灰型羟基磷灰石效果较好,蜂窝煤灰有一定的效果。猪骨灰型羟基磷灰石的氟吸附量最高可达1.28mg/g,蜂窝煤灰可达1.00mg/g。猪骨灰型羟基磷灰石出水含氟量的最低值为0.39mg/L,氟去除率达94.3%。蜂窝煤灰除氟的最低含氟量为4.25mg/L,接近北京市三级排放标准。不同pH值条件下的除氟实验表明,酸性条件下蜂窝煤灰对氟的吸附量大大增加,出水含氟量明显降低,为1.44mg/L,pH值的变化对猪骨灰型羟基磷灰石的除氟效果影响不大。蜂窝煤灰和猪骨灰型羟基磷灰石的平衡吸附曲线表明,吸附作用为多层分子吸附,利用蜂窝煤灰和猪骨灰型羟基磷灰石对氟的吸附量和出水含氟量数据,估算了平衡吸附曲线表达式的系数。

       

      Abstract: The adsorb defluoridation experiment, performed by using pig ash of phosphorite with hydroxy, fly ash from honeycomb briquette and hematite, demonstrated that pig ash of phosphorite with hydroxy easily produced excellent effect, fly ash from honeycomb briquette took second place and hematite performed worse. The maximum fluorine adsorption of pig ash of phosphorite with hydroxy could reach 1.28mg/g and 1.00mg/g made by fly ash from honeycomb briquette. The minimum of effluent fluorine of pig ash of phosphorite with hydroxy is 0.39mg/L, with 94.3% defluoridation. By fly ash from honeycomb briquette, fluorine can be 4.25mg/L at the lowest, close to the Beijing Tertiary Emission Standard. In different pH values, the results indicated that, in acidic condition, adsorption of fly ash from honeycomb briquette could be much improved, and effluent fluorine reducing remarkably was 1.44mg/L. The effect of pH changing on defluoridation by pig ash of phosphorite with hydroxy was less. Isothermal adsorption curve of fly ash from honeycomb briquette and pig ash of phosphorite with hydroxy represented Second Kind Curve summarized by Tang Shouyin, which showed adsorption is made by multi-layer molecule. Based on fluorine adsorption and effluent fluorine of fly ash from honeycomb briquette and pig ash of phosphorite with hydroxy, the authors estimated coefficient of B.E.T. expression in isothermal adsorption curve.

       

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