Immobilization of Phosphorus in Biosolids-Amended Soils by Water Treatment Residual Nanoparticles | ||||
| Alexandria Science Exchange Journal | ||||
| Article 21, Volume 37, April-June - Serial Number 2, June 2016, Page 309-325 PDF (2.3 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/asejaiqjsae.2016.2498 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Ahmed M. Mahdy  ; Elsayed A. Elkhatib; Abdel-Monem M. Balba; Gomaa E. Ahmed
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| Department of Soil and Water Sciences, Alexandria University, Alexandria, 21545, Egypt | ||||
| Abstract | ||||
| Phosphorous mobility in soil environments is largely controlled by P sorption and desorption reactions. This study was designed to evaluate the effects of water treatment residual nanoparticles (nWTRs) at different rates on P mobility in biosolids-amended soils. Sorption and desorption batch experiments were performed on two different soils amended with biosolids at a rate of 3% and 3 rates of nWTRs (0.10, 0.20, and 0.30%). The sorption data showed that nWTRs increased the amount of P sorbed by the biosolids-amended soils with the effect increases as the nWTR application rate increases suggesting that more sorption sites were added on the soil surface as a result of nWTRs addition. The modeling of sorption equilibrium data showed that Langmuir model fit the data much better than Freundlich, Elovich, Kiselev Hill-de Boer, Fowler– Guggenheim, and Temkin models, with relatively higher R2values and smaller standard error of estimates (SE). Whereas, the power function and first order kinetics models provided much better fit for the P adsorption kinetics as evidenced by higher coefficient of determination (R2) and lower SE values. Application of nWTRs with different rates to the clay soil drastically reduced the percentage of desorbed P to 6, 4, and 1% from clay soil and to 12, 7 and 4% from sandy soil at 0.10, 0.20 and 0.30% application rates, respectively. The lack of similarity between adsorption and desorption due to the hysteresis is likely a result of binding to Al/Fe hydroxides. Fourier transmission infrared (FTIR) results indicate the crucial role of surface hydroxyl groups in P retention onto nWTRs. | ||||
| Keywords | ||||
| phosphorus- mobility; sortion- nanoparticles | ||||
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