镧改性改善饮用水处理残渣吸附性能的简单方法,Chemosphere

La的负载量可以大大提高饮用水处理残渣（DWTR）的吸附能力，从而实现更好的回收利用。通常，修饰是基于DWTR和La溶液以一定比例孵育，然后进行固液分离和干燥过程。本研究试图通过采用高比例的DWTR和La溶液以消除固液分离来简化La装载程序，以促进潜在的实际生产。根据短期（2 d）和长期（30 d）P吸附测试的结果，N 2气体吸附和解吸分析，X射线光电子能谱分析以及金属分馏，保持了改性DWTR吸附能力的大幅提高，并且在改性过程中消除了固液分离过程后，La对DWTR的负载机理几乎没有改变。通常，对于有和没有分离过程的改性DWTR ，La负载将初始P吸附速率从1.00（原始DWTR）增加到6.08和6.03 mg g -1 d -1。此外，修饰前后的DWTR对蜗牛Bellamya aeruginosa的存活几乎没有不利影响。，但消除分离过程往往会降低改性DWTR中Al，Fe和La的生物利用度。这些结果表明，固液分离不是DWTR改性的关键步骤，并且开发的简单改性方法对于La装载到DWTR是可行的，从而促进了环境修复中的有益循环。

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A simple method to improve the adsorption properties of drinking water treatment residue by lanthanum modification

The loading of La can substantially enhance the adsorption capability of drinking water treatment residue (DWTR) for better recycling. Normally, the modification was based on incubation of DWTR and La solution at a certain ratio, following by solid-liquid separation and drying processes. This study attempted to simplify La loading procedures by adopting high ratio of DWTR and La solution to eliminate the solid-liquid separation, aiming to promote the potential actual production. According to the results of the short- (2 d) and long-term (30 d) P adsorption tests, the N2 gas sorption and desorption analysis, the X-ray photoelectron spectroscopy analysis, and the metal fractionation, the substantial enhanced adsorption capability of the modified DWTR was maintained and the La loading mechanisms to DWTR changed little after eliminating solid-liquid separation processes during modification; typically, La loading increased the initial P adsorption rates from 1.00 (raw DWTR) to 6.08 and 6.03 mg g−1 d−1 for the modified DWTR with and without the separation processes. Furthermore, the DWTR before and after modification had little unfavorable effect on the survival of snail Bellamya aeruginosa, while eliminating the separation processes tended to reduce the bioavailability of Al, Fe, and La in the modified DWTR. These results demonstrated that solid-liquid separation was not the key step for DWTR modification and that the developed simple modification method was feasible for La loading to DWTR, promoting the beneficial recycling in environmental remediation.