Impacts of water temperature on phosphorus release of sediments under flowing overlying water

2020 ◽  
Vol 235 ◽  
pp. 103717
Author(s):  
Xiaolong Cheng ◽  
Yanan Huang ◽  
Ran Li ◽  
Xunchi Pu ◽  
Wendian Huang ◽  
...  
Keyword(s):  
Water Temperature ◽  
Phosphorus Release ◽  
Overlying Water

scholarly journals Fleshy Red Algae Mats Influence Their Environment in the Mediterranean Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Neele Schmidt ◽  
Yusuf C. El-Khaled ◽  
Felix I. Roßbach ◽  
Christian Wild
Keyword(s):  
Environmental Factors ◽  
Light Intensity ◽  
Water Temperature ◽  
Mediterranean Sea ◽  
Water Column ◽  
Red Algae ◽  
Water Movement ◽  
Ecosystem Engineer ◽  
Overlying Water ◽  
The Mediterranean

In the Mediterranean Sea, the fleshy red alga Phyllophora crispa forms dense mats of up to 15 cm thickness, mainly located on rocky substrates in water depths below 20 m. Because of the observed density of these mats and some first observations, we hypothesize that P. crispa is a yet undescribed ecosystem engineer that provides a multitude of ecological niches for associated organisms along small-scale environmental gradients. Therefore, we conducted an in-situ pilot study in the Western Mediterranean Sea to assess potential influence of the algae mats on the key environmental factors water movement, temperature and light intensity. We comparatively and simultaneously measured in P. crispa mats, in neighboring Posidonia oceanica seagrass meadows, on neighboring bare rocky substrates without algae mats, and in the directly overlying water column. We used several underwater logging sensors and gypsum clod cards. Findings revealed that P. crispa significantly reduced water movement by 41% compared to the overlying water column, whereas water movement was not affected by P. oceanica meadows and bare rocky substrates. Surprisingly, P. crispa increased the water temperature by 0.3°C relative to the water column, while the water temperature in P. oceanica and on bare rocky substrates was reduced by 0.5°C. Light intensity inside the red algae mats was reduced significantly by 69% compared to the water column. This was similar to measured light reduction of 77% by P. oceanica. These findings highlight the strong influence of the dense red algae mats on some key environmental factors. Their influence is obviously similar or even higher than for the well-known seagrass ecosystem engineer. This may be a factor that facilitates associated biodiversity similarly as described for P. oceanica.

scholarly journals Distribution and Release Characteristics of Phosphorus in a Reservoir in Southwest China

2019 ◽  
Vol 16 (3) ◽  
pp. 303 ◽  
Author(s):  
Yuanming Wang ◽  
Kefeng Li ◽  
Ruifeng Liang ◽  
Shiqing Han ◽  
Yong Li
Keyword(s):  
Water Temperature ◽  
Release Rate ◽  
Surface Sediments ◽  
Southwest China ◽  
Particulate Phosphorus ◽  
Limiting Factor ◽  
Dam Construction ◽  
Overlying Water ◽  
Reservoir Water ◽  
Main Form

Dam construction changes the nutrient transport of a river system. Phosphorus is an important fundamental material in the global biochemical cycle and is always a limiting factor in the primary productivity of reservoirs. Extending the study of phosphorus in reservoirs is necessary given the dam construction in southwest China. Zipingpu Reservoir was chosen as the research site in this study. The form and distribution of phosphorus in the reservoir’s surface sediments and overlying water were analyzed. The results showed that overall, the total phosphorus (TP) content of surface sediments in the Zipingpu Reservoir decreased from the tail to the front of the dam. The TP content ranged from 682.39 to 1609.06 mg/kg, with an average value of 1121.08 mg/kg. The TP content at some sampling points was affected by exogenous input. Inorganic phosphorus (IP) was the main form of phosphorus in surface sediments and had a proportion of 89.38%. Among the forms of IP, the content of Ca-P was larger than that of O-P; Ex-P, Fe-P, and Al-P had the lowest contents. Particulate phosphorus (PP) was the main form of phosphorus in the overlying water of the Zipingpu Reservoir and was strongly affected by hydrodynamic conditions. The content of total dissolved phosphorus (TDP) in the overlying water was relatively low. To further understand the risk of phosphorus release in the surface sediments in the reservoir, the rate and flux of phosphorus exchange at the sediment-overlying water interface were investigated through laboratory experiments. The results showed that both water temperature and pH significantly affected the sediment release rate, but the influence of water temperature was more significant. Acidic and alkaline conditions were conducive to the release of phosphorus from sediment, while a neutral environment was not. The release rate significantly increased with increasing water temperature, and a positive linear relationship was found between these two parameters. The sediment exhibited absorption characteristics when the water temperature was extremely low and exhibited releasing characteristics at a high temperature. These results could provide a theoretical basis for the management and protection of reservoir water environments.

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.

scholarly journals Preparation and application of an innovative integrated agent product for phosphorus control and oxygen release

2021 ◽  
Author(s):  
Zhikang Zhou ◽  
Yulong Liu ◽  
Xiaogang Gu ◽  
Chaoxiang Yang ◽  
Shuguang Lyu
Keyword(s):  
Citric Acid ◽  
Calcium Phosphate ◽  
Stearic Acid ◽  
River Water ◽  
Fine Sand ◽  
Aluminum Phosphate ◽  
Phosphorus Release ◽  
Oxygen Release ◽  
Overlying Water ◽  
Dissolved Phosphorus

Abstract In this study, an oxygen-releasing and phosphorus-controlling agent (ORPC) consisting of calcium peroxide (CaO2), bentonite, cement, stearic acid (SA), citric acid (CA) and fine sand was synthesized successfully and used to purify rich-phosphorus river water. The removal of phosphorus using ORPC was studied in actual river water and the results found that over 75.0% phosphorus was removed by adding ORPC at 30 mL h−1 flow rate in the initial phosphorus concentrations of 0.76 mg L−1. The ORPC was further used to evaluate the changes of aluminum phosphate (Al-P), ferric phosphate (Fe-P) and calcium phosphate (Ca-P) in sediment. Fe-P, Al-P, and Ca-P in the sediment increased from 0.14, 0.196, and 1.63 mg g−1 to 0.159, 0.372, and 2.74 mg g−1 respectively within 28 days, indicating that the total dissolved phosphorus in the overlying water could be adsorbed by ORPC and further transformed into Al-P, Ca-P, and Fe-P in the sediment, thus inhibiting the release of endogenous phosphorus in sediment to water. Besides, the performance of ORPC with various contents of SA and CaO2 was investigated. In summary, ORPC can be employed to adsorb phosphorus in water and prevent phosphorus release from sediment, therefore achieving the purpose of controlling phosphorus and maintaining DO at a reasonable level.

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.

Phosphorus Release Processes in Nearshore Southern Lake Michigan

1986 ◽  
Vol 43 (6) ◽  
pp. 1201-1207 ◽  
Author(s):  
Michael A. Quigley ◽  
John A. Robbins
Keyword(s):  
Pore Water ◽  
Lake Michigan ◽  
Sampling Site ◽  
Soluble Reactive Phosphorus ◽  
Fine Sand ◽  
Phosphorus Release ◽  
Fickian Diffusion ◽  
Phosphorus Cycle ◽  
Release Rates ◽  
Overlying Water

We determined soluble reactive phosphorus (SRP) release rates from intact, medium-fine sand cores obtained from an 11-m-deep sampling site in nearshore Lake Michigan during July–October 1980. Mean SRP release ranged from 0.17 ± 0.03 (SE) to 0.57 ± 0.04 mg PO4-P∙m−2∙d−1. Pore water analysis indicated that, despite high dissolved oxygen concentrations in the uppermost 6 cm of sediment, SRP concentrations increased rapidly with depth throughout this zone. Moreover, a Fickian diffusion equation based on the SRP pore water gradient and physical sediment features predicted a release rate (1.12 mg PO4-P∙m−1∙d−1) that was 2–7 times higher than release rates measured from intact cores. Results suggest that nearshore sediments provide a ready pathway for the return of SRP to overlying water, and this process warrants inclusion in future conceptual models of Lake Michigan's phosphorus cycle.

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.

Ferric Nitrate Suppresses Internal Phosphorus Loading in Municipal River

2011 ◽  
Vol 393-395 ◽  
pp. 1242-1246
Author(s):  
Jian Jun Huang ◽  
Yu Hong Li ◽  
Ya Jie Gao
Keyword(s):  
Electron Acceptor ◽  
River Sediment ◽  
Phosphorus Release ◽  
Nitrogen Budget ◽  
Phosphorus Loading ◽  
Ferric Nitrate ◽  
Laboratory Studies ◽  
Overlying Water ◽  
Internal Phosphorus Loading

The application of nitrate is an accepted procedure to manage eutrophication municipal rivers by controlling the phosphorus release from sediments into overlying water and offering electron acceptor for microorganism metabolism. In situ laboratory studies were carried out in simulated reactors to evaluate the potential of ferric nitrate for remediation municipal river sediment. Ferric nitrate could greatly improve the ability of bio-treatment properties for sediment. Two dose remediation experiment of ferric nitrate (70g and 35g per square meter) was carried out lasting 28 weeks. Observations showed that ferric nitrate could suppressed the release of phosphorus from the sediments. At the same time the TN concentration could reduce to common level compared to blank reactor by denitrification. As a whole the dose of 35g per square meter ferric nitrate is better. The results suggest that knowledge of a municipal river’s nitrogen budget may be a useful tool in the design of municipal river remediation efforts.

scholarly journals Benthic Nutrient Fluxes across Subtidal and Intertidal Habitats in Breton Sound in Response to River-Pulses of a Diversion in Mississippi River Delta

Water ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2323
Author(s):  
Robert R. Twilley ◽  
Silke Rick ◽  
Daniel C. Bond ◽  
Justin Baker
Keyword(s):  
Water Temperature ◽  
Mississippi River ◽  
Flood Pulse ◽  
Early Spring ◽  
Temperature Threshold ◽  
Benthic Fluxes ◽  
Overlying Water ◽  
River Diversion ◽  
Diversion Structure ◽  
Intertidal Habitats

We measured benthic fluxes of dissolved nutrients in subtidal sediments and intertidal soils associated with river-pulse events from Mississippi River via the operation of a river diversion structure at Caernarvon, LA. Experiments measuring benthic fluxes in subtidal habitats were conducted during the early spring flood pulse (February and March) each year from 2002 to 2004, compared to benthic fluxes of intertidal habitats measured in February and March 2004. Nitrate (NO3−) uptake rates for subtidal sediments and intertidal soils depended on overlying water NO3− concentrations at near-, mid-, and far-field locations during river-pulse experiments when water temperatures were >13 °C (NO3− removal was limited below this temperature threshold). NO3− loading to upper Breton Sound was estimated for nine river-pulse events (January, February, and March in 2002, 2003, and 2004) and compared to NO3− removal estimated by the subtidal and intertidal habitats based on connectivity, area, and flux rates as a function of NO3− concentration and water temperature. Most NO3− removal was accomplished by intertidal habitats compared to subtidal habitats with the total NO3− reduction ranging from 8% to 31%, depending on water temperature and diversion discharge rates. River diversion operations have important ecosystem design considerations to reduce the negative effects of eutrophication in downstream coastal waters.

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