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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Dialysis01:15

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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Peritoneal dialysis (PD) is a procedure that facilitates the exchange of solutes, waste products, electrolytes, and excess fluid between the blood in the peritoneal capillaries and a dialysis solution introduced into the peritoneal cavity.Principles of Peritoneal Dialysis (PD)Diffusion: Waste products such as urea and electrolytes move from high concentrations in the blood to low concentrations in the dialysate across the peritoneal membrane. This mechanism is driven by the concentration...
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Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination
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Ceramic vs polymeric membrane implementation for potable water treatment.

P Jarvis1, I Carra1, M Jafari2

  • 1Cranfield Water Science Institute, Cranfield University, Beds, UK.

Water Research
|March 17, 2022
PubMed
Summary
This summary is machine-generated.

Ceramic membranes offer a robust alternative to polymeric membranes for water purification, showing comparable permeability but better longevity and lower maintenance costs despite initial higher expenses.

Keywords:
Ceramic membranesCostFluxIntegrityLifePolymeric membranes

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Area of Science:

  • Water treatment technologies
  • Membrane science and engineering
  • Environmental engineering

Background:

  • Ceramic membranes are gaining traction as alternatives to polymeric membranes due to technological advancements and cost reductions.
  • The selection of membrane material is critical for potable water production from surface water sources, impacting technical, practical, and economic factors.

Purpose of the Study:

  • To assess the relative technical, practical, and economic merits of ceramic versus polymeric membranes for potable water production.
  • To focus on key technoeconomic factors: cleaning efficacy, membrane integrity, and labor requirements.
  • To compare the performance and durability of both membrane types using real-world data.

Main Methods:

  • Comparative analysis of ceramic and polymeric membranes using identical feedwater.
  • Technoeconomic assessments including cleaning efficacy (permeability recovery), membrane integrity, and labor.
  • Review of membrane integrity studies, sludging incidents, and pilot/full-scale operational data.
  • Incorporation of aged polymeric membrane samples from operational installations.

Main Results:

  • Bench-scale tests show no significant net permeability difference between ceramic and polymeric membranes.
  • Polymeric membranes degrade in mechanical strength and permeability over time due to cleaning agents like hypochlorite.
  • Aging polymeric membranes require more manual repair, have shorter lifespans, and incur higher replacement costs.
  • Ceramic membranes' robustness allows aggressive cleaning, impacting chemical consumption costs.
  • Sludging in polymeric membranes, potentially age-related, can occur with pre-coagulated surface waters.

Conclusions:

  • Ceramic membranes demonstrate superior long-term durability and lower maintenance needs compared to polymeric membranes.
  • While initial costs may be higher, the robustness and longevity of ceramic membranes offer a favorable cost-benefit ratio.
  • The choice between ceramic and polymeric membranes depends on a balance of operational flux, membrane life, and module cost.