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Author : Wayne P. Robarge
Publisher :
ISBN 13 :
Total Pages : 434 pages
Book Rating : 4.:/5 (89 download)
Download or read book Characterization of Sorption Sites for Phosphate written by Wayne P. Robarge and published by . This book was released on 1975 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. J. Volkweiss
Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.:/5 (78 download)
Download or read book Factors affecting phosphate sorption by soils and minerals written by S. J. Volkweiss and published by . This book was released on 1973 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction; Review of literature; Characterization of phosphate sorption sites in brazilian soils; Efffect of pH and associated cations on p sorption by soils and minerals; Results and discussion; Literature cited.
Author : Sergio Jorge Volkweiss
Publisher :
ISBN 13 :
Total Pages : 316 pages
Book Rating : 4.:/5 (89 download)
Download or read book Factors Affecting Phosphate Sorption by Soils and Minerals written by Sergio Jorge Volkweiss and published by . This book was released on 1973 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this research were to study the P sorption characteristics of soils and the effects of pH and of cation type and concentration on P sorption by soils and minerals. In an attempt to characterize the nature and properties of P sorption sites of soils, P sorption isotherms in a 0.1 N NaC1 system were obtained for six limed and unlimed agricultural soils from Rio Grande do Sul, Brazil. The equilibration time was 48 hours and the concentration of P in the final solution varied from near zero to 20 ugP/ml. Langmuir plots (c/x vs c) of the data resulted in curvilinear and/or multi-straight line relationships suggesting the presence of 2 or more populations of sites with different affinities for P. An iterative multiple regression analysis computer program that assumes that each population of site follows the Langmuir equation was used to analyze the sorption data. Three populations of sites with different affinities for P were detected and the Langmuir constants, k (binding energy term) and b (sorption maximum) were estimated for each population of sites. The median and range for values of k (ml/ug P) and b (ugP/g) for the three populations of site were in decreasing order of affinity for P:K1 = 140, (40-2870) and b1=120 (8-370); K2=2.4, (0.63-10) and b2=174, (25-704); and K3 =0.095, (0.051-0.27) and b3=763 (131-1460). On the average, the total number of P sorption sites (total) was made up of 10% of sites with high affinity for P, 22% with moderate and 68% with low affinity ...
Author : Danni Qiu Zhang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)
Download or read book Characterization of Ammonium and Phosphate Adsorption by Synthetic Zeolite written by Danni Qiu Zhang and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The excess of nitrogen and phosphorus in the wastewater has caused crucial distortion in the nature such as eutrophication of water basins, disturbed the ecological balance and spoiled the water quality. Moreover, continuing population growth make that more fertilizers are needed to the agriculture. To resolve these issues, a large number of researches related to ammonium and phosphate removal and recovery from wastewater have been carried out in the last years. Between the studied techniques, ion-exchange is one of the most competitive due to its simplicity of application and operation, low cost and use of environmental friendly materials. The goal of this project is to characterize the overall sorption performance of a zeolite synthesized from coal fly ash which was provided in sodium form (Na-Ze), and its modification in potassium form (K-Ze). It was evaluate the sorption performance of these synthesized zeolites in ammonium single system and ammonium-phosphate binary system. Equilibrium and kinetic studies were performed through the batch experiments. Equilibrium experimental data was well fitted by Langmuir isotherm equation and reported sorption capacities of 109 mg·g-1 and 21 mg·g-1 for Na-Ze and 17 mg·g-1 and 29 mg·g-1 for K-Ze in single and binary system, respectively. Binary system experiments with both zeolite reported not significant phosphate sorption. Kinetic studies showed that both sorbents follow a pseudo second order reaction model and demonstrated that the NH4+ ions removal rate by K-Ze is initially very high, achieving 90% of total sorption in the first minute whereas Na-Ze achieved only the 60% of total ammonium uptake. Finally, regeneration and reuse studies evaluated by three continuous sorption-desorption cycles demonstrated that sorption capacities increased in most cases after desorption and regeneration, probably duo to the zeolite surface activation by hydroxides.
Author : Yingming Liang
Publisher :
ISBN 13 :
Total Pages : 414 pages
Book Rating : 4.:/5 (89 download)
Download or read book Phosphate Sorption and Desorption Characteristics in Soil Systems Determined with a Polynuclear-Al-saturated Cation Exchange Resin written by Yingming Liang and published by . This book was released on 1988 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Klaus Peter Raven
Publisher :
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.:/5 (314 download)
Download or read book Characterization of the Phosphorus Supplying Capacity of Soils by Desorption Q/I Relationships and Kinetics written by Klaus Peter Raven and published by . This book was released on 1992 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Marc Galera Bella
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)
Download or read book Phosphate Recovery by Synthetic Zeolite and Fly-ash written by Marc Galera Bella and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphorus is a limited global resource; current studies have to be focused mainly on its recovery rather than its disposal. Thereby, the operational lifespan of this resource would be extended and in turn the phosphorus resources can reduce their depletion. Nowadays, wastewater represents a breakpoint of this cycle, in our daily activity. Even though legislation rules the maxim concentration of phosphate in the effluents, it is not required its recovery, and there it lies the interesting line of work. Aiming at the development of phosphorus recovery technology from the wastewater, it was investigated the sorption behaviour of phosphate (PO43-) by sorbents like fly ash and synthetic zeolites. Furthermore, with the loaded zeolite can have the potential use as a low cost fertilizer, since the sorbed phosphate can be released to the soil. On the other hand, for this project a sorbent was previously synthetized by enhanced the original synthetic zeolite named Na-P1 to its calcium form, expecting an improvement of the new sorbent (Ca-Ze) in terms of the sorption capacity. Divided into two parts this project would achieve the following objectives. Firstly, the study of the mechanism involved in the sorption process to remove the phosphate from aqueous solution by the sorbents above mentioned. Finally, the second objective was establish the settings of the working conditions for the experimentation on a hybrid sorption-ultrafiltration pilot plant, where the sorbent with best sorption feature was tested. Experiments carried out were designed to study the behaviour between sorbent and sorbate (phosphate) under different conditions. Batch experiments were carried out under conditions of pH 8, typical of treated waste water and considering two sources of phosphate. Kinetics experiments were performed using two sources of phosphate, and two different aqueous matrix; Mili-Q and tap water. The obtained data was fitted by the Langmuir and Freundlich sorption models to stablish the equilibrium. On the other hand, kinetics data were fitted by the pseudo first order, pseudo second order and Elovich models. The characterisation of the sorbents was carried out by XRD and SEM/EDAS techniques, before and after the sorption process. Moreover, as the second part of this project the best sorbent found during the equilibrium and kinetic experiment was then tested in a hybrid sorption-ultrafiltration pilot plant. Where more realistic conditions were set and tested with the aim of setting the suitable working conditions of the elements involved in the system.
Author :
Publisher : Elsevier
ISBN 13 : 0080528910
Total Pages : 809 pages
Book Rating : 4.0/5 (85 download)
Download or read book Characterization of Porous Solids VI written by and published by Elsevier. This book was released on 2002-11-14 with total page 809 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains 99 of the papers that were presented at the 6th in the series of Symposia on Characterization of Porous Solids held in Alicante, Spain, May 2002. Written by leading international specialists in the subject, the contributions represent an up-to-date and authoritative account of recent developments around the world in the major methods used to characterize porous solids. The book is a useful work of reference for anyone interested in characterizing porous solids, such as MCM-41 mesoporous materials, pillared clays, etc. Papers on pore structure determination using gas adsorption feature strongly, together with papers on small angle scattering methods, mercury porosimetry, microcalorimetry, scanning probe microscopies, and image analysis.
Author : Leo M.L. Nollet
Publisher : CRC Press
ISBN 13 : 1420006312
Total Pages : 786 pages
Book Rating : 4.4/5 (2 download)
Download or read book Handbook of Water Analysis written by Leo M.L. Nollet and published by CRC Press. This book was released on 2007-06-25 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensively revised and updated, Handbook of Water Analysis, Second Edition provides current analytical techniques for detecting compounds in water samples. Maintaining the detailed and accessible style of the original, this edition demonstrates water sampling and preservation methods by enumerating different ways to measure chemical and radiologic
Download or read book Phosphate Sorption in Single and Mixed Fe- and Al-oxide Systems written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction of phosphate with Fe(III) and Al(III) is important in soils, wastes and other systems of environmental significance. The goal of this research was to characterize phosphate sorption in single- and mixed Fe- and Al-oxide systems using XANES (X-ray absorption near edge structure spectroscopy). The specific objectives of this research were: 1) To determine the quantitative distribution of phosphate between Fe-and Al-oxide minerals in mixtures containing these minerals; 2) To assign XANES spectral features for phosphate associated with Fe(III) or Al(III) to specific electronic transitions; and 3) To characterize adsorption versus surface precipitation in single- and binary mixtures of Fe- and Al-oxide minerals. Phosphate was sorbed in single-mineral aqueous suspensions of ferrihydrite (ferric hydroxide), boehmite (aluminum oxyhydroxide), goethite (iron oxyhydroxide), or non-crystalline (non-xl) Al-hydroxide, and mixtures of ferrihydrite/boehmite, goethite/boehmite, and ferrihydrite/non-xl Al-hydroxide at pH 6. Samples were reacted at 22 degrees Celsius for 42 h. Phosphate sorption isotherm trends for mixed-mineral systems were L-curves and were intermediate to those of the respective minerals in the mixture. Phosphorus K-XANES spectra for phosphate on Fe- vs. Al-oxide minerals differed in that a weak doublet peak was observed for Fe-oxides on the low-energy side of the P K-edge, i.e., in the pre-edge region. The quantitative distribution of phosphate between ferrihydrite and boehmite in mixtures of these minerals was determined using linear combination fitting (LCF) analysis of the XANES pre-edge region. Results showed that phosphate essentially distributed itself in proportion to the maximum phosphate sorption capacity of each of these minerals. Using a XANES fitting procedure, phosphate was found to show a greater apparent preference for boehmite and non-xl Al-hydroxide minerals in goethite/boehmite and ferrihydrite/non-xl Al-hydroxide mixtures, respec.
Author : A. S. R. Juo
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (163 download)
Download or read book Phosphate Sorption Characteristics of Some Bench-mark Soils of West Africa written by A. S. R. Juo and published by . This book was released on 1977 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. Magdi Selim
Publisher : CRC Press
ISBN 13 : 148223680X
Total Pages : 381 pages
Book Rating : 4.4/5 (822 download)
Download or read book Phosphate in Soils written by H. Magdi Selim and published by CRC Press. This book was released on 2018-10-08 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edited by One of the Best Specialists in Soil Science Recent studies reveal that Phosphorus (P) in the form of phosphate, a macronutrient essential for plant growth, and crop yields can influence the bioavailability, retention, and mobility of trace elements, metal(loid)s, and radio nuclides in soils. When this occurs, phosphates can affect the dynamics of heavy metals and influence soil characteristics, impacting soil mobility and toxicity. Phosphate in Soils: Interaction with Micronutrients, Radionuclides and Heavy Metals utilizes the latest research to emphasize the role that phosphate plays in enhancing or reducing the mobility of heavy metals in soil, and the soil-water-plant environment. It provides an in-depth understanding of each heavy metal species, and expands on phosphate interactions in geological material. Composed of 12 chapters, this text: Provides an overview of the reactions of metal(loid)s and common P compounds that are used as fertilizer in soils Emphasizes the effect of phosphorus on copper and zinc adsorption in acid soils Discusses findings on the influence of phosphate compounds on speciation, mobility, and bioavailability of heavy metals in soils as well as the role of phosphates on in situ and phytoremediation of heavy metals for contaminated soils Places emphasis on the influence of phosphate on various heavy metals species in soils, and their solubility/mobility and availability Provides extensive information on testing various high phosphate materials for remediation of heavy metal, micronutrients, and radionuclides contaminated sites Explores the reactivity of heavy metals, micronutrients and radionuclides elements in several soils Presents a case study illustrating various remediation efforts of acidic soils and remediation of Cu, Zn, and lead (Pb) contaminated soils around nonferrous industrial plants Emphasizes the significance of common ions (cations and anions) on phosphate mobility and sorption in soils, and more The author includes analytical and numerical solutions along with hands-on applications, and addresses other topics that include the transport and sorption modeling of heavy metals in the presence of phosphate at different scales in the vadose zone.
Author : David C. Coleman
Publisher :
ISBN 13 :
Total Pages : 288 pages
Book Rating : 4.3/5 (91 download)
Download or read book Dynamics of Soil Organic Matter in Tropical Ecosystems written by David C. Coleman and published by . This book was released on 1989 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constituents of organic matter in temperate and tropical soils. Soil organic matter as a source and a sink of plant nUtrients. Interactions of soil organic matter and variable-charge clays. Biological processes regulating organic matter dynamics in tropical soils.
Author : Zinabu Wolde
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659599842
Total Pages : 68 pages
Book Rating : 4.5/5 (998 download)
Download or read book Phosphorus Sorption Chractersitics of Some Soils of Southern Ethiopia written by Zinabu Wolde and published by LAP Lambert Academic Publishing. This book was released on 2014-10-06 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Declining of soil fertility and management of plant nutrient have made gap between the native and added nutrient of the soil. Phosphorus is an essential macro nutrient for plant growth and it's generally added to soil as a fertilizer and increase the physiological efficiency of crop. Nowadays, using phosphorus fertilizer is mandatory for most Ethiopian soil due to its deficiency. When phosphate fertilizer is applied to soil and dissolved by the soil water, various reactions occur between phosphate and soil constituents' who removes phosphorus from the solution phase and render its availability with phenomena called P fixation or sorption. These books try to cover the determinant factor for grouping soil as high and low P fixing. The adsorption maximum(Xm) shows the sorption capacity of the soil, while K(Bonding energy) and SPR(Standard Phosphorus Requirement) helps to categorize the soil as high and low sorbing soil. The determinant soil parameters which can influence soil to have high fixation character were explained in this book accordingly.
Author : Abu Talib Bachik
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (969 download)
Download or read book Phosphate Sorption Characteristics in Four Soils of Malaysia written by Abu Talib Bachik and published by . This book was released on 1982 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas D. Branigan
Publisher :
ISBN 13 :
Total Pages : 97 pages
Book Rating : 4.:/5 (427 download)
Download or read book Phosphate Sorption and Desorption Characteristics of Irish Soils and Their Relationship with Other Soil Properties written by Thomas D. Branigan and published by . This book was released on 1977 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xialei You Chen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)
Download or read book Phosphate Recovery from Waste Water Treatment Plant by Commercial Ion Exchangers written by Xialei You Chen and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last years were performed a huge number of research related to phosphorus removal and recovery from waste water in order to reuse this element and also to avoid eutrophication. Among the different techniques studied, adsorption is nowadays one of the most interesting alternatives. The aim of this project is to characterize the overall adsorption performance of two commercial ion exchangers, the resin Lewatit FO36 and the fibre Fiban-As (FAs), both prepared for arsenic selective adsorption but, due to their chemical similarity, can be also used for phosphate adsorption. Equilibrium and kinetics studies were performed through the batch experiments and the dynamic studies were carried out by the fixed-bed column experiments. The experimental study covered from the most simple monocomponent synthetic water (phosphate) to the complex real water from waste water treatment plant (WWTP). Equilibrium experimental data was well described by Langmuir isotherm and reported sorption capacities between 89 and 163 mg/g and the effect of interfering anions on sorption capacity was evaluated through factorial experiments concluding that both sorbents are highly selective to phosphate compared with bicarbonate, sulphate, nitrate and chloride. Furthermore, the sorption kinetic for both sorbents is controlled by the particle diffusion stage and follows a pseudo second order reaction model. The efficiency in the phosphate removal was described by Thomas, Yoon-Nelson and Bed Time Service Time model reporting capacities between 31 and 5 mg/g. Finally, the adsorbate regeneration efficiency was evaluated by five sorption cycles obtaining good results in the case of the fibre Fiban-As and a decrease of more than 60% of phosphate adsorption capacity in the first regeneration for resin FO36.
