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Related Concept Videos

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Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Factorial Design

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Factorial Analysis is an experimental design that applies Analysis of Variance (ANOVA) statistical procedures to examine a change in a dependent variable due to more than one independent variable, also known as factors. Changes in worker productivity can be reasoned, for example, to be influenced by salary and other conditions, such as skill level. One way to test this hypothesis is by categorizing salary into three levels (low, moderate, and high) and skills sets into two levels (entry level...
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Phosphorous recovery through struvite crystallization: Challenges for future design.

Bing Li1, Irina Boiarkina2, Wei Yu2

  • 1Department of Chemical & Materials Engineering, The University of Auckland, New Zealand; Department of Hydraulic Engineering, Tsinghua University, China.

The Science of the Total Environment
|October 21, 2018
PubMed
Summary

Phosphorus recovery via struvite crystallization is a promising solution to prevent water pollution and resource depletion. This review simplifies process design, aiding industrial application of this vital nutrient recycling method.

Keywords:
Phosphorus recoveryProcess designProduct applicationProduct qualityStruvite

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Sustainable Chemistry

Background:

  • Phosphorus (P) is essential for life but faces depletion within a century.
  • Low phosphorus utilization efficiency causes significant losses and water pollution globally.
  • Struvite crystallization offers a viable method for phosphorus recovery and reuse.

Purpose of the Study:

  • To review key aspects of struvite crystallization for industrial process design.
  • To streamline design options and reduce analytical calculations for struvite recovery.
  • To provide comprehensive information for future industrial applications.

Main Methods:

  • Review of existing literature on struvite crystallization processes.
  • Analysis of research trends, product applications, and economic factors.
  • Development of a conceptual process design for struvite recovery.

Main Results:

  • Identified struvite crystallization as a promising technique for phosphorus recovery.
  • Highlighted the gap between extensive research and limited industrial implementation.
  • Provided a conceptual design to facilitate practical application.

Conclusions:

  • Struvite crystallization is a key technology for phosphorus management and pollution control.
  • This review simplifies process design, accelerating industrial adoption.
  • The study offers essential insights for scaling up phosphorus recovery.