Research on phosphorus loads and characteristics of adsorption and release in surface sediments of Nanyang Lake and Weishan Lake in China

Zhang, Shuwu; An, Wenchao; Li, Xiaoming

doi:10.1007/s10661-014-4103-0

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…Regional differences in the petrographic type and the effective mineral quality of the phosphate rock has also inherently led to studies focusing on the formation conditions and mechanical properties of phosphate (Nguidi et al, 2021). Specifically, focus has been on the influence of the ancient geographical environment on the formation of inter-crystalline strength of the rocks (Priyank et al, 2015;Qin et al, 2015;Zhang et al, 2015;Han et al, 2016;Pan et al, 2017;Orlov et al,2020). These studies have shown that the basic mechanical behaviour of rocks is influenced by the mineral composition, structure type, and formation conditions.…”

Section: Introductionmentioning

confidence: 99%

Using Maxwell’s Theory to model and quantify the fracture evolution of cyclothymic deposition phosphate rock

et al. 2023

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The evolution and stability of fracturing in the cyclothymic deposition of phosphate rocks are strongly affected by the viscoelasticity and structural form of the rock-forming minerals. Presently, there is no standardized method that has been widely accepted to accurately quantify the elastic-plastic deformation and fracturing of such striped structural rock nor reflect the role of the different lithogenous minerals in phosphate rocks when subjected to viscoelastic strain loading. In this study, integrated mathematical equations were formulated for modelling the mechanical and fracture behaviour of cyclothymic deposition in structured phosphate rocks. These constitutive equations were developed based on Maxwell’s Theory after the elastic modulus and damping coefficient of the rock-forming mineral from the mechanical testing were substituted into the derived-equations. In these new models, the apatite stripes and dolomite stripes were incorporated into the transverse isotropic model through the analysis of structural characteristics of the phosphate rock. Through experimental validation, the response curves of the creep and stress relaxation tests were found to be consistent with the deformation curves generated by modelling using the mathematical equations. Overall, the formulated model along with the corresponding equations was found to exhibit good applicability properties to describe phosphate’s mechanical and fracture behaviour under low horizontal compressive stresses. In the study, the creep mechanism in phosphate rocks were satisfactorily analysed from the angles of microscopic morphology, cracks evolution, and inter-crystalline strength. The hard brittle apatite was found to be surrounded and separated by high creep variant dolomite. Furthermore, the analysis showed that dolomite crystals possessing high creep properties dominated the distribution and evolution of secondary structures in the phosphate rock, under the condition of long-term low-stress loading.

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Section: Introductionmentioning

confidence: 99%

Using Maxwell’s Theory to model and quantify the fracture evolution of cyclothymic deposition phosphate rock

et al. 2023

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Influence of ignited sediments on external phosphorus adsorption and sedimentary phosphorus forms

Zhu

Huang

et al. 2017

Environ Sci Pollut Res

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Phosphorus (P) adsorpted by sediments, when covered by and mixed with ignited sediments from Meiliang Bay in Tai Lake, was analyzed in the laboratory. Potassium dihydrogen phosphate (KHPO) was added to the parallel experimental units to simulate periodic external P input. Based on the Langmuir model, the sediments after ignition had a greater S (maximum P adsorption), a lower equilibrium phosphorus concentration at zero adsorption (EPC), and a lower degree of phosphorus saturation in comparison with sediments without ignition. This was confirmed by the variation in the dissolved inorganic phosphorus in the overlying water. When sediments were mixed with or covered by the ignited sediments, 5.985 and 5.978 mg of input P disappeared from the overlying water, respectively. However, when the sediments were mixed with the ignited sediments, 84.18% of the input P was converted to HCl-P, whereas when they were covered by the ignited sediments, sedimentary P was released, mainly from Fe/Al-P (up to 87.50%). This was attributed to differences in the microenvironments where less-intense anaerobic conditions were formed in the mixed sediments than in the sediments covered by the ignited sediments. This suggests that the injection of ignited sediments into existing sediments enhances their P adsorption and retention. It is favor of the control of the eutrophication with a simple technology.

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Distribution and model prediction of antibiotic resistance genes in Weishan Lake based on the indication of Chironomidae larvae

Ding

Gong²,

Zhang³

et al. 2022

Water Research

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Research on phosphorus loads and characteristics of adsorption and release in surface sediments of Nanyang Lake and Weishan Lake in China

Cited by 4 publications

References 14 publications

Using Maxwell’s Theory to model and quantify the fracture evolution of cyclothymic deposition phosphate rock

Using Maxwell’s Theory to model and quantify the fracture evolution of cyclothymic deposition phosphate rock

Influence of ignited sediments on external phosphorus adsorption and sedimentary phosphorus forms

Distribution and model prediction of antibiotic resistance genes in Weishan Lake based on the indication of Chironomidae larvae

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