The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China.
The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China.
J Environ Sci (China). 2014 Dec 1;26(12):2397-405. doi: 10.1016/j.jes.2014.04.002. Epub 2014 Oct 12.
Batch experiments were conducted to investigate the phosphorus (P) adsorption and desorption on five drinking water treatment residuals (WTRs) collected from different regions in China. The physical and chemical characteristics of the five WTRs were determined. Combined with rotated principal component analysis, multiple regression analysis was used to analyze the relationship between the inherent properties of the WTRs and their P adsorption capacities. The results showed that the maximum P adsorption capacities of the five WTRs calculated using the Langmuir isotherm ranged from 4.17 to 8.20mg/g at a pH of 7 and further increased with a decrease in pH. The statistical analysis revealed that a factor related to Al and 200 mmol/L oxalate-extractable Al (Alox) accounted for 36.5% of the variations in the P adsorption. A similar portion (28.5%) was attributed to an integrated factor related to the pH, Fe, 200 mmol/L oxalate-extractable Fe (Feox), surface area and organic matter (OM) of the WTRs. However, factors related to other properties (Ca, P and 5 mmol/L oxalate-extractable Fe and Al) were rejected. In addition, the quantity of P desorption was limited and had a significant negative correlation with the (Feox+Alox) of the WTRs (p<0.05). Overall, WTRs with high contents of Alox, Feox and OM as well as large surface areas were proposed to be the best choice for P adsorption in practical applications.
批量实验研究了磷（P）在取自中国不同地区的五种饮用水处理厂剩余物（WTR）上的吸附和解吸特性。测定了五种 WTR 的物理化学性质。结合旋转主成分分析，采用多元回归分析，研究了 WTR 固有性质与其 P 吸附能力之间的关系。结果表明，五种 WTR 在 pH 值为 7 时的最大 Langmuir 等温线 P 吸附容量范围为 4.17 至 8.20mg/g，进一步随着 pH 值的降低而增加。统计分析表明，与 Al 相关的一个因子和 200mmol/L 草酸盐提取的 Al（Alox）占 P 吸附变化的 36.5%。一个与 WTR 的 pH 值、Fe、200mmol/L 草酸盐提取的 Fe（Feox）、表面积和有机物（OM）有关的综合因子占 28.5%。然而，与其他性质（Ca、P 和 5mmol/L 草酸盐提取的 Fe 和 Al）相关的因子被排除。此外，P 解吸量有限，与 WTR 的（Feox+Alox）呈显著负相关（p<0.05）。总体而言，对于实际应用中的 P 吸附，建议选择 Alox、Feox 和 OM 含量高且表面积大的 WTR。
