Download or read book Investigation of Calcium Phosphate and Magnesium Ammonium Phosphate Precipitation in Wastewater Treatment written by Ronald Leo Horres and published by . This book was released on 1977 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calcium Phosphate Precipitation in Wastewater Treatment written by Arnold B. Menar and published by . This book was released on 1972 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Magnesium Ammonium Phosphate Precipitate in an Anaerobic Digester System written by Terrence John McManus and published by . This book was released on 1974 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calcium Phosphate Precipitation in Wastewater Treatment written by Arnold B. Menar and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultimate Disposal of Phosphate from Waste Water by Recovery as Fertilizer written by W.R. Grace & Co. Dearborn Chemical Division and published by . This book was released on 1970 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigations on the Recovery of Phosphorus from Wastewater by Crystallization written by Laura Pastor and published by Universal-Publishers. This book was released on 2006-06-27 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, due to expanding populations and industries, regulatory authorities have imposed tighter discharge limits on nutrients from wastewater treatment facilities to avoid eutrophication in water streams. Common methods, such as metal salt precipitation, are being used to lower phosphorus concentrations which are a main contribution. However, alternate phosphorus removal techniques, such as phosphorus crystallisation, can provide further benefits. Precipitated solid can be utilised as a marketable fertiliser. Principles of magnesium and ammonia phosphate precipitation, working with a synthetic wastewater and a supernatant coming from dewatering an anaerobic digested sludge, are studied in this work. NOTE: This thesis is in Spanish.
Download or read book Investigations on Phosphorus Removal from Wastewater by Precipitation of Calcium Phosphate Induced by Seeding Crystals written by D. Donnert and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Stability of Magnesium Ammonium Phosphate MgNH4PO46H2O and a Method of Determining Phosphorus as Magnesium Ammonium Phosphate MgNH4PO46H2O written by William Archer Worsham and published by . This book was released on 1923 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Phosphate Precipitation at Two Municipal Wastewater Treatment Facilities written by Shawn H. Veltman and published by . This book was released on 1984 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book World fertilizer trends and outlook to 2022 written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2019-10-30 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the world nitrogen, phosphorus and potassium fertilizer medium-term supply and demand forecasts for the period 2017-2022. FAO, in collaboration with other members of the Fertilizer Outlook Expert Group dealing with fertilizer production, consumption and trade, provides forecasts of world and regional fertilizer supply, demand and potential balance.
Download or read book Electrochemical Phosphate Recovery From Wastewater By Magnesium Ammonium Phosphate Hexahydrate Struvite Crystallization written by Ruhi Sultana and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recovery of phosphate from wastewater sources in the form of inorganic magnesium ammonium phosphate hexahydrate (or struvite) precipitates (or struvite) is an advantageous choice, particularly because it can be used as a slow-release fertilizer in agriculture. Section 1 of this dissertation provides an introduction and review of the electrochemical recovery of P using a sacrificial magnesium (Mg) anode via hydrolysis in a bench scale electrochemical reactor. As a result of corrosion, Mg2+ is electrochemically released from the anode and struvite precipitates through an interaction between Mg2+ and the ammonium and phosphate ions in the solution. A 316 stainless steel cathode provides the site for water reduction to dihydrogen (H2) and hydroxyl ions (OH-) and oxygen reduction to water. In section 2, a scaled-up batch electrochemical reactor has been designed to examine how the performance of the reactor changed over successive batches as anode degradation and fouling decreased struvite yield by 52% and increased energy consumption by 77%. This is because Mg oxidation, when exposed to phosphate solution, resulted in a dynamic change on the anode surface (i.e., corrosion and struvite build up) which likely influenced the reactor performance. Controlling electrode fouling and enhancing Mg dissolution for struvite precipitation requires an investigation into corrosion mechanisms at the electrode surface. Therefore, sections 3 and 4 present a mechanistic description of electrode passivation and struvite formation in presence of chloride ions (0-1500 mM) and dynamic voltage changes to the electrochemical reactor at frequencies 0.1-100 Hz. An insight into the process parameters affecting struvite precipitation, including solution pH, Mg overpotential, and chloride concentration, guided experiment design and simulation of product distribution analysis using Visual Minteq 3.1 software suggested optimum electrochemical struvite production in the pH range 8--10. In section 5, a first-of-its-kind electrochemical struvite precipitation was reported in an electrochemical packed bed reactor with pure Mg beads as the packing material. While the lower costs of the beads, reduced the overall cost of operating the reactor, the smaller surface area ensured a larger specific area and a higher yield. In a synthetic solution of ammonium dihydrogen phosphate, the performance of the electrochemical precipitation column was studied by varying the applied current, feed flow rate, and Mg bead diameter. The system achieved >60% phosphate removal as struvite at 50 mA, 0.6 L m-1, with 5-6 mm bead size. The experimental outcomes assisted in comprehending the variables that affected struvite recovery in a flow-based reactor design as well as the difficulties associated with switching from a batch reactor to a flow reactor system. A summary of the key findings of this study have been presented in section 6, along with a list of future research areas that are to be explored.
Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 22 (thesis year 1977) a total of 10,658 theses titles from 28 Canadian and 227 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. While Volume 22 reports theses submitted in 1977, on occasion, certain universities do report theses submitted in previous years but not reported at the time.
Download or read book Research Reporting Series written by and published by . This book was released on 1972 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nutrient Removal and Recovery by the Precipitation of Magnesium Ammonium Phosphate written by Guangan Jia and published by . This book was released on 2014 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphate and ammonium are the main nutrient sources in wastewater, contributing to eutrophication of water bodies. Removal of these nutrients from wastewater using conventional technologies is a challenge in water industry. Many processes have been developed to remove these two nutrients. On the other hand, phosphorus from nature is not infinite, which will be running out in about 50 - 100 years. Therefore recycling phosphorus is becoming an issue, as well as a challenge, for researchers all over the world. This research is to investigate a chemical process technology to recover the nutrients by the precipitation of magnesium ammonium phosphate (MAP), which is valuable product and nutrient fertiliser. This is a new process based on the chemical equilibrium, which is greatly affected by pH of the solution, concentrations of Mg2+, NH4+, PO43−, and other ions and organic matters included in the wastewater. In order to implement this process, the optimal pH, and the best molar ratio of Mg2+, NH4+ and PO43− must be adequately studied. In this thesis, the optimal pH and optimization of the molar ratio of Mg2+:NH4+:PO43−, were studied based on synthetic wastewater. It was found that the best pH range was 9-9.5, and the best molar ratio was Mg2+:NH4+:PO43− =1.3:1:1.1 Visual MINTEQ 3.0 software was then introduced to predict the possible solids precipitated and additional alkaline required in order to maintain the optimal pH value during experiments. Laboratory scale experiments were carried out under the same conditions of model input. Struvite yielded from laboratory experiments was tested and confirmed by SEM and X-ray diffraction. The results indicated that the experimental results agreed well with that of model prediction within the error deviation. Reagent addition rate and temperature were also tested in terms of removal efficiency and morphology of the precipitates. These two factors can affect size and morphology of crystals, but have limited impact on the removing efficiency compared to pH and concentration. The main advantages of this technology are to recover nutrients and to prevent eutrophication. Preliminary results of operational factors of laboratory scale MAP system have been discussed and presented. Conclusions and recommendations were also made in this work.
Download or read book The Precipitation of Phosphates from Fersh Waters and Waste Waters written by John F. Ferguson and published by . This book was released on 1969 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigations of Solid and Liquid Phase Conditions for the Precipitation of Calcium Phosphate from Wastewater Systems written by Vanessa DeMarco and published by . This book was released on 2014 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phosphate Study at the Baltimore Back River Wastewater Treatment Plant written by Baltimore (Md.) and published by . This book was released on 1970 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
