Immobilization and Release Behavior of Phosphorus on Phoslock-Inactivated Sediment under Conditions Simulating the Photic Zone in Eutrophic Shallow Lakes,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Immobilization and Release Behavior of Phosphorus on Phoslock-Inactivated Sediment under Conditions Simulating the Photic Zone in Eutrophic Shallow Lakes
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-10-15 , DOI: 10.1021/acs.est.9b04093
Xiaodi Li ₁ , Zhiyong Zhang ₁ , Qiang Xie ₁ , Renjie Yang ₁ , Tong Guan ₁ , Deyi Wu ₁

Affiliation

Phosphorus-inactivating agents (PIAs) have increasingly been applied and extensively investigated to control internal phosphorus loading in lakes. However, little is known about the behavior of PIA-amended sediment in terms of phosphorus immobilization and release when the sediment is resuspended in the photic layer, whose environment differs from the lake bed. Lanthanum-modified bentonite (LMB) is a popular PIA product. In this study, the 33 day core incubation experiment under dark conditions showed that capping sediment with LMB efficiently decreased the concentration of total phosphorus, total dissolved phosphorus, and dissolved inorganic phosphorus (DIP) by 90, 87, and 99%, respectively. Resuspension into overlying water under light conditions at high pH, high dissolved organic carbon, and in the presence of algae significantly impedes the performance of LMB. However, the adoption of a higher LMB dose improved the performance, including a reduction in the phosphorus level and control of algal growth. The dynamics of the phosphorus migration when the LMB-inactivated sediment was resuspended into the photic zone mainly involves the release of DIP from the sediment and the uptake of DIP by algae and LMB. In conclusion, a higher dose is needed in the PIA (particularly Phoslock) application in shallow productive lakes where sediment resuspension occurs frequently.

中文翻译：

模拟富营养化浅水湖泊磷化带条件下磷在磷灭活沉积物上的固定和释放行为

磷灭活剂（PIA）已被越来越多地应用和广泛研究以控制湖泊中的内部磷负荷。但是，对于PIA修饰的沉积物在磷的固定和释放方面的行为知之甚少，因为沉积物被重新悬浮在与湖床环境不同的光层中。镧改性膨润土（LMB）是一种流行的PIA产品。在这项研究中，在黑暗条件下进行的33天岩心温育实验表明，用LMB封盖沉积物可以有效地将总磷，总溶解磷和溶解无机磷（DIP）的浓度分别降低90％，87％和99％。在高pH，高溶解有机碳的光照条件下重悬于上层水中，并且在藻类存在的情况下会严重阻碍LMB的性能。但是，采用更高剂量的LMB可以改善性能，包括降低磷含量和控制藻类生长。当LMB灭活的沉积物重新悬浮到光化区时，磷迁移的动力学主要涉及DIP从沉积物中的释放以及藻类和LMB对DIP的吸收。总之，PIA（尤其是Phoslock）在浅水湖泊中经常需要沉积物重悬，因此需要更高的剂量。当LMB灭活的沉积物重新悬浮到光化区时，磷迁移的动力学主要涉及DIP从沉积物中的释放以及藻类和LMB对DIP的吸收。总之，PIA（尤其是Phoslock）在浅水湖泊中经常需要沉积物重悬，因此需要更高的剂量。当LMB灭活的沉积物重新悬浮到光化区时，磷迁移的动力学主要涉及DIP从沉积物中的释放以及藻类和LMB对DIP的吸收。总之，PIA（尤其是Phoslock）在浅水湖泊中经常需要沉积物重悬，因此需要更高的剂量。

更新日期：2019-10-16

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南