Phosphorus Recovery from Wastewater Via Struvite Crystallization in a Fluidized Bed Reactor PDF Download

Author: Pengfei Wang
Publisher:
ISBN: 9783835673618
Category :
Languages : en
Pages :

View

Book Description

Author: Christian Schaum
Publisher: IWA Publishing
ISBN: 1780408358
Category : Science
Languages : en
Pages : 592

View

Book Description
This comprehensive book provides an up-to-date and international approach that addresses the Motivations, Technologies and Assessment of the Elimination and Recovery of Phosphorus from Wastewater. This book is part of the Integrated Environmental Technology Series.

Author: François M. M. Morel
Publisher: John Wiley & Sons
ISBN: 9780471548966
Category : Science
Languages : en
Pages : 610

View

Book Description
Presents aquatic chemistry in a way that is truly useful to those with diverse backgrounds in the sciences. Major improvements to this edition include a complete rewrite of the first three background chapters making them user-friendly. There is less emphasis on mathematics and concepts are illustrated with actual examples to facilitate understanding.

Author: Ruhi Sultana
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

View

Book Description
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.

Author: Laura Pastor
Publisher: Universal-Publishers
ISBN: 1581123337
Category : Nature
Languages : en
Pages : 44

View

Book Description
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.

Author: Harada Hiroyuki
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 0

View

Book Description
A bubble column, a fluidized bed, and a continuous stirred tank reactor were evaluated as equipment for recovering phosphorus from various wastewaters. Magnesium was added to the solution which contained ammonia and potassium with phosphorus at high concentrations such as livestock wastewater, dehydrated water from a sewage plant, and synthetic livestock wastewater. Magnesium ammonium phosphate or magnesium potassium phosphate could be recovered by adjusting the pH of the solution. Alternatively, calcium was added and then the pH was adjusted to obtain hydroxyapatite solid conditions without seed crystals.

Author: E. Valsami-Jones
Publisher: IWA Publishing
ISBN: 1843390019
Category : Science
Languages : en
Pages : 681

View

Book Description
Phosphorus in Environmental Technology: Principles and Applications, provides a definitive and detailed presentation of state-of-the-art knowledge on the environmental behaviour of phosphorus and its applications to the treatment of waters and soils. Special attention is given to phosphorus removal for recovery technologies, a concept that has emerged over the past 5-6 years. The book features an all-encompassing approach: the fundamental science of phosphorus (chemistry, geochemistry, mineralogy, biology), key aspects of its environmental behaviour and mobility, industrial applications (treatment, removal, recovery) and the principles behind such applications, novel biotechnologies and, importantly, it also addresses socio-economic issues which often influence implementation and the ultimate success of any new technology. A detailed subject index helps the reader to find their way through the different scientific and technological aspects covered, making it an invaluable reference work for students, professionals and consultants dealing with phosphorus-related environmental technologies. State-of-the-art knowledge on the behaviour of phosphorus and its applications to environmental science and technology. Covers all aspects of phosphorus in the environment, engineered and biological systems; an interdisciplinary text.

Author: H. Ohtaki
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 232

View

Book Description
An overview of crystallization processes of organic and inorganic substances from various homogeneous liquids. Crystal structures, phase transitions and crystallization rates are described in the book in connection with the structure of ions, complexes and molecules of the solution phase.

Author: Robina Farooq
Publisher: BoD – Books on Demand
ISBN: 953513129X
Category : Science
Languages : en
Pages : 280

View

Book Description
The book on Physico-Chemical Treatment of Wastewater and Resource Recovery provides an efficient and low-cost solution for remediation of wastewater. This book focuses on physico-chemical treatment via advanced oxidation process, adsorption, its management and recovery of valuable chemicals. It discusses treatment and recovery process for the range of pollutants including BTX, PCB, PCDDs, proteins, phenols, antibiotics, complex organic compounds and metals. The occurrence of persistent pollutants poses deleterious effects on human and environmental health. Simple solutions for recovery of valuable chemicals and water during physico-chemical treatment of wastewater are discussed extensively. This book provides necessary knowledge and experimental studies on emerging physico-chemical processes for reducing water pollution and resource recovery.

Author: Tao Zhang
Publisher:
ISBN: 1838810218
Category : Chemistry, Organic
Languages : en
Pages : 106

View

Book Description
Phosphorus, as a common chemical substance, plays an important role in human life, but also causes serious harm to the environment. The recovery and utilization of phosphorus is extremely urgent. The series of studies carried out by the author are described in detail in this book.