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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.
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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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A Modified EPA Method 1623 that Uses Tangential Flow Hollow-fiber Ultrafiltration and Heat Dissociation Steps to Detect Waterborne Cryptosporidium and Giardia spp.
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Magnetic Active Water Filter Membrane for Induced Heating to Remove Biofoulants.

Hoang Nguyen, Nareg Ohannesian, Pasan C Bandara

  • 1Department of Physics and Astronomy, University of Texas Rio Grande Valley, 1201 West University Drive, Edinburg, Texas 78539, United States.

ACS Applied Materials & Interfaces
|January 17, 2020
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This study introduces a novel magnetic nanoparticle coating for filter membranes. Induction heating effectively removes biofouling, extending membrane life and reducing water purification costs.

Keywords:
bacteria deactivationbiofoulantsinduction heatingmagnetic nanoparticlesmembrane filtration

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Biotechnology

Background:

  • Filter membranes are crucial for water purification but suffer from biofouling, leading to reduced efficiency and increased costs.
  • Biofouling, caused by bacterial and contaminant aggregation, necessitates frequent membrane replacement, disrupting operations.

Purpose of the Study:

  • To develop a sustainable method for removing biofoulants from filter membranes.
  • To enhance the longevity and cost-effectiveness of membrane filtration processes.

Main Methods:

  • Coating filter membranes with magnetite (Fe3O4) magnetic nanoparticles (MNPs).
  • Applying alternating magnetic fields (AMF) to induce heating on the MNP-coated membrane surface.
  • Testing biofouling removal using model bacteria (Bacillus subtilis) and environmental water samples.

Main Results:

  • Induction heating reached 180 °C at a rate of 1.03 °C/s, effectively disintegrating biofoulants.
  • The cleaning process was successful for multiple cycles without compromising membrane filtration function.
  • Uniform, high-intensity heat generation was achieved rapidly over large surface areas.

Conclusions:

  • Magnetite nanoparticle coating and induction heating offer a promising solution for biofouling in membrane filtration.
  • This method provides a scalable, cost-effective approach for industrial water purification applications.
  • The technique enhances membrane durability and operational efficiency.