给水厂残泥-海藻酸钠胶珠对磷的吸附特性
Adsorption characteristics of phosphorus on drinking water treatment residuals-sodium alginate beads
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摘要: 为解决给水厂残泥（WTR）作为磷吸附材料用于水处理工艺时存在的沉降性能差和易堵塞等问题，本研究利用海藻酸钠包埋法制备了给水厂残泥-海藻酸钠（WTR-SA）胶珠，考察了WTR-SA胶珠对磷的吸附与解吸附特征.研究结果表明WTR-SA胶珠对磷的动力学吸附过程符合准二级动力学方程（R2=0.9957），Freundlich方程能较好描述其对磷的等温吸附过程（R2=0.9907），Langmuir方程模拟得到的磷饱和吸附量为1.878 mg·g-1；随着溶液pH的升高，WTR-SA胶珠对磷的吸附量呈现先上升后下降的趋势，在pH5时吸附量最高；WTR-SA胶珠对磷的吸附稳定，在接近饱和吸附量条件下，磷的解吸率仅为0.72%；磷分级提取结果表明磷主要以稳定的铝结合态、铁结合态和钙结合态存在于WTR-SA胶珠中，3种赋存形态含量占比分别为43.2%、22.7%和21.3%.Abstract: In order to solve the problems of granular drinking water treatment residuals (WTR) in wastewater treatment application, globular WTR-sodium alginate (WTR-SA) beads were prepared using the sodium alginate embedding method, and the adsorption characteristics of phosphorus on WTR-SA beads was examined in this study. Results showed that the kinetics of phosphorus adsorption on WTR-SA beads followed pseudo-second-order kinetic model. (R2=0.9957), and its adsorption isotherm was well described by Freundlich equation (R2=0.9907).The maximum adsorption amount of phosphorus simulated by the Langmuir equation was 1.88 mg·g-1. With the increase of solution pH from 3 to 11, the amount of phosphorus adsorption in WTR-SA beads showed a trend of increasing first and then decreasing. The optimal initial pH value for phosphate adsorption was 5. The desorption rate of phosphorus was only 0.72% under the condition of near saturation adsorption. Phosphorus fractionation results showed that phosphorus existed mainly in Al-bound, Fe-bound and Ca-bound forms, accounting for 43.2%, 22.7%, and 21.3%, respectively.
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