scholarly journals Hydrodynamic disturbance on phosphorus release across the sediment–water interface in Xuanwu Lake, China

2018 ◽  
Vol 19 (3) ◽  
pp. 735-742 ◽  
Author(s):  
Yu Bai ◽  
Yuhong Zeng ◽  
Bei Nie ◽  
Helong Jiang ◽  
Xiaofeng Zhang
Keyword(s):  
Lattice Boltzmann ◽  
Shear Velocity ◽  
Phosphorus Release ◽  
Water Interface ◽  
Hydrodynamic Conditions ◽  
Overlying Water ◽  
Important Index ◽  
Hydrodynamic Disturbance ◽  
Predicted Values ◽  
Boltzmann Method

Abstract Excess phosphorus in lakes may cause algal blooming, and total phosphorus (TP) is an important index for lake eutrophication. As an important source of TP, lake sediment contributes a lot to TP release. TP release across the sediment–water interface varies with the hydrodynamic conditions of the overlying water, and in this paper the release characteristics of TP under hydrodynamic disturbance has been investigated. The sediment samples from Xuanwu Lake are collected and their release characteristics of TP under varying shear velocity are simulated in laboratory apparatus. Results show that increasing shear velocity contributes to the release of TP from sediment and the combination of varying shear velocity in different stages has a significant influence on the distribution of TP concentration. Further, the lattice Boltzmann method (LBM) is used to simulate the process of TP release from the sediment–water interface and the predicted values agree well with the measured data, which proves that the LBM can be used in simulating the process of TP release from sediment.

scholarly journals Numerical Simulation of Phosphorus Release with Sediment Suspension under Hydrodynamic Condition in Mochou Lake, China

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 370 ◽  
Author(s):  
Yu Bai ◽  
Jinhua Gao ◽  
Tianyi Zhang
Keyword(s):  
Lattice Boltzmann ◽  
Phosphorus Release ◽  
Hydrodynamic Condition ◽  
Sediment Suspension ◽  
Hydrodynamic Conditions ◽  
Lake Water Quality ◽  
Overlying Water ◽  
Dissolved Phosphorus ◽  
Experimental Process ◽  
Boltzmann Method

Phosphorus is a major cause of lake eutrophication. Understanding the characteristics regarding the release of phosphorus from sediments under hydrodynamic conditions is critical for the regulation of lake water quality. In this work, the effects of sediment suspension on the release characteristics of phosphorus from sediment were investigated under different hydrodynamic conditions. The experimental results showed that in the experimental process, the phosphorus was at first released quickly into the overlying water but then slowed down. Furthermore, the process of dissolved phosphorus (DP) release under hydrodynamic conditions with and without sediment suspension was simulated using a lattice Boltzmann method. The simulation showed satisfying results.

scholarly journals Phosphorus Fractions and Release Factors in Surface Sediments of a Tailwater River in Xinmi City, a Case Study

2021 ◽  
Vol 13 (10) ◽  
pp. 5417
Author(s):  
Shanheng Huang ◽  
Hongbin Xu ◽  
Dan Shang ◽  
Junzhao Liu ◽  
Qiuju Tang ◽  
...  
Keyword(s):  
Total Phosphorus ◽  
Elevated Temperatures ◽  
Organic Phosphorus ◽  
Paper Industry ◽  
Phosphorus Release ◽  
Overlying Water ◽  
Sewage Plant ◽  
P Content ◽  
Hydrodynamic Disturbance ◽  
Alkaline Conditions

The Shuangji River in Xinmi City is a tailwater-type river. Its main water sources are the effluent from the domestic sewage plant, the effluent from the paper industry sewage plant and the coal well. The construction of wastewater treatment facilities in Xinmi city has significantly reduced the amount of total phosphorus (TP) discharged into Shuangji River. However, phosphorus control in rivers where the overlying waters are predominantly tailwaters is still a challenge, especially as the sediment–water interface’s phosphorus exchange mechanism needs to be investigated in detail. In this study, the content and proportion of each phosphorus fraction in the sediment of a tailwater-type river, the Shuangji River, were determined. It was found that the organic phosphorus (OP) and iron-bound phosphorus (Fe-P) content and proportion were high, and the risk of release was relatively high in the section of the river where the overlying water was the tailwater of a sewage plant. Temperature, pH, dissolved oxygen, and hydraulic disturbance were also found to control phosphorus forms’ transformation and release in the sediment. Elevated temperatures mainly stimulated the release of OP and Fe-P from the sediments. The dissolution of calcium-bound phosphorus (Ca-P) is the main pathway for phosphorus release under acidic conditions, whereas, under alkaline conditions, phosphorus release is mainly controlled by ion exchange between OH− and Fe-P and metal oxide-bound phosphorus (Al-P). Aerobic versus anaerobic conditions cause changes in Fe-P content in the sediment mainly by changing Fe ions’ chemical valence. Hydrodynamic disturbance accelerates labile-P release, but once the hydrodynamic disturbance stops, the overlying water dissolved total phosphorus (DTP) concentration rapidly decreases to a similar concentration as before.

Estimation of Nitrogen and Phosphorus Release Rates at Sediment-Water Interface of Nansi Lake, China

2012 ◽  
Vol 573-574 ◽  
pp. 573-577
Author(s):  
Bao Li ◽  
Zhi Qi Wang
Keyword(s):  
Water Body ◽  
Lake Restoration ◽  
Sediment Cores ◽  
Sampling Period ◽  
Phosphorus Release ◽  
Water Interface ◽  
Nansi Lake ◽  
Release Rates ◽  
Nitrogen And Phosphorus ◽  
Overlying Water

At present, Nansi Lake restoration is maily focused on reducing extraneous pollution, however, it is unclear about the endogenous pollution. In this study, twelve intact sediment cores were collected from four sub-lakes (Nanyang Lake, Dushan Lake, Zhaoyang Lake and Weishan Lake) in Nansi Lake, and the fluxes of NH4+-N, PO43--P, NO3--N, TN and TP at sediment-water interface were calculated based on static incubation of sediment cores with a laboratory-scale benthic chamber. The incubation results showed fluxes of PO43--P, NO3--N, TN and TP in Nanyang Lake were the highest and as follows: 2.73, 7.55, 44.43 and 3.06 mg/m2.d, respectivly, and the flux of NH4+-N in Nanyang Lake, Dushan Lake and Zhaoyang Lake had little difference ranged from 8.99 to 10.19 mg/m2.d. This study indicated that during the sampling period sediment acted as a source of nitrogen as well as phosphorus to the overlying water body in Nansi Lake.

Sign in / Sign up

Export Citation Format

Share Document