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Formation of Concentrated Urine

Formation of Concentrated Urine

There is a gradient of solutes in the interstitial fluid from the renal cortex through the medulla, known as the medullary osmotic gradient. The juxtamedullary nephrons establish and maintain this gradient using countercurrent mechanisms with loops extending deep into the medulla. These nephrons also use countercurrent mechanisms to regulate urine volume and concentration. The interaction between the descending and ascending limbs of the nephron loop creates an osmotic gradient through...

Precipitation and Co-precipitation

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

Formation of Dilute Urine

Formation of Dilute Urine

The formation of dilute urine is a critical renal adaptation that maintains fluid balance, particularly during periods of high fluid intake. This process primarily involves the juxtamedullary nephrons. By adjusting the permeability of water and ions in response to physiological conditions, the kidneys can either conserve or excrete water, resulting in concentrated or dilute urine.
Filtrate Osmolarity in the PCT
Initially, as the filtrate passes through the proximal convoluted tubule (PCT), its...

Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

Factors Affecting Solubility

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:

Formation of Complex Ions

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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Related Experiment Video

Updated: May 28, 2025

Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability

Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability

Published on: June 21, 2015

Uranium concentration from acidic mine effluent using forward osmosis.

Mohit Verma¹, Vijay A Loganathan¹

¹Civil Engineering Department, Indian Institute of Technology Ropar, Rupnagar, 140001 Punjab, India.

Journal of Environmental Management

|February 14, 2025

Summary

This summary is machine-generated.

Forward osmosis (FO) concentrates uranium mine effluent using sodium sulfate, allowing direct reuse of the draw solution. Cyclic operation minimizes membrane fouling, offering an energy-efficient alternative to evaporation for uranium extraction.

Keywords:

Critical concentration factor Forward osmosis Fouling Typical mine effluent Uranium

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Electrochemically and Bioelectrochemically Induced Ammonium Recovery

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Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

Area of Science:

Hydrometallurgy
Water Treatment Technologies
Environmental Engineering

Background:

Uranium extraction presents challenges in efficient and low-energy-intensive processing.
Mine effluents contain uranium requiring effective concentration and management.
Conventional evaporation methods for uranium concentration are highly energy-intensive.

Purpose of the Study:

To assess the efficacy of forward osmosis (FO) for concentrating uranium mine effluent.
To evaluate the direct reusability of the draw solution (sodium sulfate) in uranium leaching.
To investigate methods for mitigating membrane fouling and flux decline during FO concentration.

Main Methods:

Laboratory-scale forward osmosis experiments using synthetic uranium mine effluent.
Testing a 160-hour duration with sodium sulfate as the draw solution.
Evaluating membrane regeneration techniques (DI water rinsing, physical cleaning) and cyclic operation modes.

Main Results:

Forward osmosis achieved a 3.36-fold concentration of uranium with 98% rejection.
Significant flux decline was observed due to membrane fouling and surface crystallization.
Cyclic operation below critical concentration factor effectively avoided fouling and minimized maintenance.
Concentrated uranium levels were below Indian regulatory guidelines for inland water discharge.

Conclusions:

Forward osmosis is a viable, low-temperature, and energy-efficient method for concentrating uranium mine effluent.
Sodium sulfate draw solution can be directly reused in uranium leaching, simplifying the process.
Cyclic operation is a key strategy to ensure sustained performance and reduce maintenance needs in FO systems for uranium recovery.