School of Environmental Science and Engineering, Suzhou University of Science and Technology, No. 1, Kerui Road, Suzhou, 215009, China.
Environ Sci Pollut Res Int. 2020 May;27(13):15440-15453. doi: 10.1007/s11356-020-08105-8. Epub 2020 Feb 19.
Currently, in situ capping is a typical popular geoengineering method for eutrophication control. It is crucial to better understand the effect of microenvironment change due to capping, such as amended calcium peroxide material (ACPM) and Phoslock®, on phosphorus (P) adsorption and immobilization under the addition of external P. The microenvironment in sediment was presented by the concentration of O, NH, and Fe and microbial activity. The P removal and immobilization were also analyzed. The results show that the stronger oxidation in the microenvironment under the capping with ACPM was due to the higher reduction of NH and Fe and the higher increase of microbial activity, compared to Phoslock®. Although, under the capping of ACPM, less amount of external P was removed and there was a faster release of sedimentary P, compared to Phoslock®, ACPM improved the transformation of P from mobile P fractions to inert P fractions. In addition, sedimentary P under the capping of ACPM presents less release than that under the capping of Phoslock® during the anaerobic incubation. However, the settlement of suspended solids decreased the function of capping. All these results indicated that the mechanism of P removal and immobilization was different under the capping of ACPM and Phoslock®.
目前，原位封盖是一种典型的富营养化控制的地球工程方法。更好地了解封盖后微环境变化（如改性过氧化钙材料（ACPM）和 Phoslock®）对添加外部磷条件下磷（P）吸附和固定的影响至关重要。沉积物中的微环境由 O、NH 和 Fe 的浓度和微生物活性来呈现。还分析了 P 的去除和固定。结果表明，与 Phoslock®相比，ACPM 封盖下微环境的氧化作用更强，这是由于 NH 和 Fe 的还原更高，微生物活性的增加更高。尽管如此，与 Phoslock®相比，ACPM 封盖下，外部 P 的去除量较少，沉积物 P 的释放速度较快，但 ACPM 改善了 P 从可移动 P 分数向惰性 P 分数的转化。此外，在厌氧孵育期间，ACPM 封盖下的沉积物 P 的释放量低于 Phoslock®封盖下的沉积物 P 的释放量。然而，悬浮固体的沉降降低了封盖的作用。所有这些结果表明，ACPM 和 Phoslock®封盖下 P 的去除和固定机制不同。
