优化改性赤泥颗粒吸附含磷废水

Adsorption of Phosphorus-containing Wastewater by Optimized Granular Modified Red Mud

通过改变发泡剂(碳酸氢钠)的添加量,对改性赤泥颗粒进行优化。研究不同脱附剂对优化后改性赤泥颗粒的脱附和再吸附效果,选择出最佳脱附剂;利用优化后的改性赤泥颗粒进行动态吸附含磷污水实验,研究优化后的改性赤泥颗粒对水中磷的动态吸附效果。结果表明,在改性赤泥颗粒的配比中适当增加发泡剂(碳酸氢钠)的比例可以提高改性赤泥颗粒对磷的吸附能力,优化后改性赤泥对磷的吸附量提高17%,吸附达到稳定的时间缩短了33%;对吸附饱和后的优化改性赤泥颗粒可选择0.5%的盐酸溶液进行再生;经SBR处理后的含磷污水(满足生活污水二级排放标准),通过优化后改性赤泥颗粒对其动态吸附后,可满足生活污水一级标准。在不计运行成本、制作和脱附成本条件下,按赤泥颗粒原材料市场价进行成本分析可知,优化后改性赤泥颗粒处理SBR出水的达一级排放标准的原材料成本为2.06元/t。

The granular modified red mud was optimized by changing the added content of foaming agent （sodium bicarbonate） in this paper. Then study on desorption and re-adsorption effect of different desorption solvents, and based on optimized granular modified red mud to choose the best desorption solvent. Dynamic adsorption experiment of phosphorus wastewater by optimized granular modified red mud was done, which could study the dynamic adsorption effect of optimized granular modified red mud on phosphorus wastewater. The results showed that increasing the proportion of sodium bicarbonate in the composition of granular modified red mud could improve the adsorption capacity, and 0.5% hydrochloric acid could be chosen to regenerate the optimized granular modified red mud after adsorbed saturation by phosphorus wastewater. After the dynamic adsorption from granular modified red mud, the phosphorus-containing wastewater treated by SBR could meet the National Discharge Standard Rank 1 from Rank 2. Regardless of the costs of operation and production, and according to the market price level, the raw material cost is about 2.06 yuan/t.