Total Phosphorus Release from Bottom Sediments in Flowing Water

Zhang, Kun; Cheng, Pengda; Zhong, BaoChang; Wang, Dao-zeng

doi:10.1016/s1001-6058(11)60281-3

Cited by 41 publications

(20 citation statements)

References 13 publications

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“…In these experiments, the organic matter and other impurities need to be removed firstly from the sediment samples containing pollutants, and the specific methods are prescribed in accordance with Ref. [16].…”

Section: Sediment Samplingmentioning

confidence: 99%

Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

Zhu

Cheng²,

et al. 2017

Acta Mech. Sin.

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Vertical distribution processes of sediment contaminants in water were studied by flume experiments. Experimental results show that settling velocity of sediment particles and turbulence characteristics are the major hydrodynamic factors impacting distribution of pollutants, especially near the bottom where particle diameter is similar in size to vortex structure. Sediment distribution was uniform along the distance, while contaminant distribution slightly lagged behind the sediment. The smaller the initial sediment concentration was, the more time it took to achieve a uniform concentration distribution for suspended sediment. A contaminants transportation equation was established depending on mass conservation equations. Two mathematical estimation models of pollutant distribution in the overlying water considering adsorption and desorption were devised based on vertical distribution of suspended sediment: equilibrium partition model and dynamic micro-diffusion model. The ratio of time scale between the sediment movement and sorption can be used as the index of the models. When this ratio was large, the equilibrium assumption was reasonable, but when it was small, it might require dynamic micro-diffusion model.

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Section: Sediment Samplingmentioning

confidence: 99%

Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

Zhu

Cheng²,

et al. 2017

Acta Mech. Sin.

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“…Therefore, the evaluation of SOD was recommended to properly assess the release rate of the related chemicals in fresh and seawater [7][8][9][10][11].…”

Section: Sample Collection and Preparationmentioning

confidence: 99%

“…It is thus suggested that contaminants are more easily released under anaerobic conditions [4][5][6]. Therefore, the evaluation of SOD was recommended to properly assess the release rate of the related chemicals in fresh and seawater [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Impact of Salinity Change on Water Quality Variables from the Sediment of an Artificial Lake under Anaerobic Conditions

Kim

Kang

Kim³

et al. 2017

Sustainability

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Artificial reservoirs are created by dike construction in coastal areas to secure the agricultural water supply on the west coast of South Korea. These systems are found to retain brackish characteristics until total desalination is achieved. To evaluate the effects of salinity on the organic substances released from the sediment, a laboratory water-sediment column experiment was conducted to assess associated changes in water quality variables such as the sediment oxygen demand (SOD), chemical oxygen demand (COD), and concentrations of nitrogen (N) and phosphorus (P). Under high salinity conditions, the release of N from the sediment was promoted with the enhancement of SOD and COD. This trend was accounted for by the response of the microorganisms (cell breakdown of algae and suppression of metabolic activity). Our results suggest that chemicals (N, P, and COD) released from sediment and its overall impact on the water quality of a brackish lake should vary depending on the temporal and spatial dynamics of the salinity.

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“…According to the model shown in Fig.1, the N-S equations for pump side chamber flow were simplified by ignoring the per unit mass force [27,28], which can be written as …”

Section: Theoretical Computations For Liquid Pressure Approximate Anamentioning

confidence: 99%

Computational Study and Experimental Verification for Fluid Static Pressure in Centrifugal Pump Side Chamber

Zhang¹,

Xi²,

Liu³

et al. 2016

Proceedings of the 2016 5th International Conference on Sustainable Energy and Environment Engineering (ICSEEE 2016)

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Abstract. A flow model was proposed to compute the fluid pressure in pump side chamber. Based on which the flow can be regarded as a secondary and axisymmetric viscous laminar flow, which is the superposition of circumferential shear flow and radial differential pressure one. These were described using N-S equations. By comparing orders of magnitude, the N-S equations were simplified. They were then integrated to obtain the analytical solutions. The correction coefficient of potential head was introduced to determine simplified computation model for fluid pressure inside chamber. By ignoring the influence of leakage, the final computation model was established. This research used the model to predict the pressure profiles of a centrifugal pump and the theoretical profile agrees well with the experimental one.

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Total Phosphorus Release from Bottom Sediments in Flowing Water

Cited by 41 publications

References 13 publications

Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

Impact of Salinity Change on Water Quality Variables from the Sediment of an Artificial Lake under Anaerobic Conditions

Computational Study and Experimental Verification for Fluid Static Pressure in Centrifugal Pump Side Chamber

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