Abstract: To provide the slight alkaline environment and sufficient calciumions is the important condition to achieve efficient adsorption phosphate by adsorbent. Taking cement, xonotlite, clay, flying ash and CaO as primary raw materials, TBX porous ceramisite filter media was prepared by hydrothermal reaction and steam curing. Based on the leaching rate of calcium ions and pH transients of lixivium, the operation conditions were achieved. The filter media was applied to remove the low concentration phosphate in wastewater. The results show that under the dose of filter media 1% (mass fraction) and 10 mg/L of phosphate, after 120 min of adsorption, the concentration of residual phosphate could be reduced to 0.2mg/ L which was far lower than the State-specified standards. As the result of the properties of efficient phosphate adsorption and low cost, TBX porous ceramisite filter media should be promising in the field of the treatment of severe-eutrophic water body and municipal sewage.

Key words: CaSiO₃, xonotlite, porous ceramisite, adsorption of phosphate

摘要： 提供微碱性氛围和足够的钙离子浓度是实现高效吸附除磷的重要条件。以白色硅酸钙水泥、硬硅钙石、粉煤灰、黏土和氧化钙等为主要原料, 经水热反应和高温蒸汽养护制备了TBX 多孔陶粒滤料。通过考察试验材料的钙离子浸出速度和浸出液 pH 值变化过程, 确定了高效吸磷滤料的制备工艺。应用制备滤料处理低浓度含磷废水的试验结果显示:在投加量质量分数为 1% , 磷酸盐溶液浓度为10 mg/ L, 吸附 2 小时后, 残 留液磷含量可达0.2mg/L以下, 远低于城镇污水处理厂综合排放一级 A 标准。由于高效吸附除磷特性和低廉造价, 在城市污水除磷和富营养化水体修复领域, TBX 多孔陶粒滤料将有着 良好的工程应用前景。

关键词: 硅酸钙, 硬硅钙石, 多孔陶粒, 吸附除磷