scholarly journals Engineered biochar from sugarcane leaves with slow phosphorus release kinetics

2022 ◽  
Vol 156 ◽  
pp. 106304
Author(s):  
Siraprapa Suwanree ◽  
Jesper T.N. Knijnenburg ◽  
Pornnapa Kasemsiri ◽  
Wasawat Kraithong ◽  
Prinya Chindaprasirt ◽  
...  
Keyword(s):  
Release Kinetics ◽  
Phosphorus Release ◽  
Engineered Biochar

Phosphorus Release Kinetics in Biofilm Reactors

1992 ◽  
Vol 26 (3-4) ◽  
pp. 567-576 ◽  
Author(s):  
F. A. Ruiz-Treviño ◽  
S. González-Martínez ◽  
C. Doria-Serrano ◽  
M. Hernández-Esparza
Keyword(s):  
Phosphorus Removal ◽  
Release Kinetics ◽  
Phosphorus Release ◽  
Organic Substrate ◽  
Biofilm Reactor ◽  
Substrate Uptake ◽  
Biofilm Reactors ◽  
Initial Substrate ◽  
Linear Behaviour ◽  
Substrate Concentrations

This paper presents the kinetic analysis, using Generalized Power-Law equations to describe the results of an experimental investigation conducted on a batch submerged biofilm reactor for phosphorus removal under an anaerobic/aerobic cycle. The observed rates and amounts of phosphorus release and organic substrate uptake in the anaerobic phase leads to a kinetic model in which these two variables are dependent on each other with a non-linear behaviour and reach equilibrium values in both cases, at different times and are function of rate constants ratio. The model has a good fit with experimental data except for C uptake at anaerobic contact times longer than four hours, where other kinetics are implied. Kinetic parameters were obtained with different initial substrate concentrations, anaerobic contact cycles, and type of substrates.

Release Kinetics of Phosphorus in Sediments from Baihua Lake

2012 ◽  
Vol 599 ◽  
pp. 91-95 ◽  
Author(s):  
Jin Mei ◽  
Ji Wei Hu ◽  
Xian Fei Huang ◽  
Li Ya Fu ◽  
Jin Luo ◽  
...  
Keyword(s):  
Organic Phosphorus ◽  
Release Kinetics ◽  
Phosphorus Release ◽  
Release Kinetic ◽  
Iron Aluminum ◽  
P Content ◽  
Elovich Equation ◽  
Release Data ◽  
The Relationship ◽  
Kinetics Of

Release kinetics of phosphorus in 17 sediments samples collected from Baihua Lake were determined, and the relationship between the phosphorus release kinetic parameters and the sediment composition was also investigated. The results showed that both the Elovich equation and power function equation were valid models for describing the phosphorus release data in the 17 sediments. Within the beginning 12 h, the rate of phosphorus release was high, and then decreased. Our correlation analysis demonstrates that there were no significant correlations between the maximum capacity of phosphorus release (Qmax) and the content of total nitrogen (TN), organic matter (OM), calcium-bound phosphorus (Ca-P), and organic phosphorus (OP). But the correlation between Qmax and iron/aluminum-bound phosphorus (Fe/Al-P) content was positive (R2 = 0.6064, P < 0.01), suggesting that Fe/Al-P might be the main contributor to the released phosphorus in the sediments.

scholarly journals Characteristics and Kinetics of Phosphorus Release from Formulated Fertilizer in Clay Loam Soil

KIMIKA ◽  
2019 ◽  
Vol 30 (2) ◽  
pp. 1-4
Author(s):  
Vernadette J. Soriano ◽  
Veronica P. Migo ◽  
Monet Concepcion Maguyon-Detras ◽  
Catalino G. Alfafara
Keyword(s):  
Light Scattering ◽  
Kinetic Model ◽  
Dynamic Light Scattering ◽  
Release Kinetics ◽  
Phosphorus Release ◽  
Particle Dynamic ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Loam Soil ◽  
Kinetics Of

A kinetic study for the phosphorus release of a formulated CaHAP-Z fertilizer was done to observe its behavior when applied to clay loam soil. The study of release kinetics of CaHAP-Z was done along with CaHAP and the control fertilizer Solophos™ to determine whether the formulated fertilizer can be an alternative for the conventional fertilizer. Results showed that the formulated fertilizer CAHAP-Z contains 3.73% phosphorus with 513.10 nm particle (Dynamic Light Scattering) indicating that the formulated fertilizer can be classified as a nanofertilizer. The formulated CaHAP-Z fertilizer showed the slowest release kinetics compared to the controls. In addition, this study showed that the simple Elovich kinetic model is the general equation that best fits to describe the phosphorus release of fertilizers.

Phosphorus release kinetics and solubility capacity of phosphorus fractionation induced by organic acids from a black soil in northeast China

2019 ◽  
Vol 99 (1) ◽  
pp. 92-99
Author(s):  
Xiaoyan Yang ◽  
Xiangwei Chen ◽  
Xitian Yang
Keyword(s):  
Citric Acid ◽  
Organic Acids ◽  
Organic Acid ◽  
Path Analysis ◽  
Release Kinetics ◽  
Black Soil ◽  
Phosphorus Release ◽  
Phosphorus Fractionation ◽  
Transformation Rate ◽  
P Release

Phosphorus (P) fertilizers are added to improve the soil P fertility, but the rate of P release can greatly influence its availability. Organic acids are effective in the release of inorganic P (Pi), but the contribution of each Pi fraction is not well understood. This study reported the transformation rate of P and solubility of Pi fractions induced by organic acids. Path analysis was utilized to explore the direct and indirect effects of Pi fractions on the amount of total Pi (TPi) solubilized. Results showed that the P release was initially rapid, followed by a slower release that lasted up to 2160 h, and the Elovich equation was the best-fitted kinetic equation to estimate the transformation rate of available P. The amount of TPi-solubilized by oxalic and citric acids tended to increase with increasing organic acid concentrations. Oxalic acid exhibited a lower TPi-solubility capability than citric acid when the organic acid concentration was ≤1 mmol L−1, whereas citric acid was higher at ≥1.5 mmol L−1. The Al-P-solubilized had the highest content of studied fractions, and path analysis revealed that the Al-P-solubilized exhibited a significant direct effect on TPi-solubilized. Thus, Al-P is a potential P source in black soil.

scholarly journals Phosphorus release kinetics in a soil amended with biosolids and vermicompost

2013 ◽  
Vol 71 (3) ◽  
pp. 1441-1451 ◽  
Author(s):  
M. Islas-Espinoza ◽  
L. Solís-Mejía ◽  
M. V. Esteller
Keyword(s):  
Release Kinetics ◽  
Phosphorus Release

scholarly journals Kinetics of Phosphorus Release from Vivianite, Hydroxyapatite, and Bone Char Influenced by Organic and Inorganic Compounds

Soil Systems ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 15 ◽  
Author(s):  
Elisabeth Schütze ◽  
Stella Gypser ◽  
Dirk Freese
Keyword(s):  
Citric Acid ◽  
Inorganic Compounds ◽  
Release Kinetics ◽  
Phosphorus Release ◽  
Bone Char ◽  
Soil P ◽  
P Release ◽  
P Fertilizer ◽  
Poorly Soluble

The availability of P is often insufficient and limited by accumulation in soils. This led to the necessity of solutions for the recovery as well as recycling of secondary P resources. Batch experiments were conducted with CaCl2 and citric acid to characterize P release kinetics from vivianite, hydroxyapatite, and bone char. While the P release during the CaCl2 treatment was so low that only vivianite and hydroxyapatite showed a slightly higher release with increasing CaCl2 concentration, the increase of dissolved P was more pronounced for citric acid. The application of citric acid resulted in a 32,190-fold higher P release for bone char. Fourier-transform infrared spectroscopic data suggested higher instability of hydroxyapatite than for bone char. The kinetic data showed that bone char, especially at a lower particle size, had a higher long-term P release than hydroxyapatite or vivianite. The suitability of hydroxyapatite and bone char as a poorly soluble, but sustainable P source is better than that of vivianite. However, the efficiency as a P fertilizer is also dependent on present soil P mobilization processes. The results underline the importance of the accessibility of fertilized or naturally bound P for plant roots to benefit from the excretion of organic acids.

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