Using nanoparticles to treat wastewater in a greener way

Environmental Business Review | Monday, December 05, 2022

Nanoparticles can efficiently reduce pollutants and are magnetic, which makes them readily recoverable for reuse, hence using this method as an effective method to clean wastewater treatment filters.

FREMONT, CA: Membrane filters need less energy to purify water by letting famous for wastewater treatment. To keep these materials in the maximum quality condition, they are often cleaned with large amounts of strong chemicals. Nevertheless, some of these agents eliminate the membranes in the process. Lately, researchers have developed reusable nanoparticle catalysts that amalgamate glucose to support and efficiently segregate contaminants inside these filters without damaging them.

Wastewater filters are cleared with strong acids, bases, or oxidants. Oxidants with chlorine, like bleach, can collapse the most stubborn organic debris. The drawback is that they hurt polyamide membranes in commercial nanofiltration systems and induce toxic byproducts. Another bleach option is hydrogen peroxide, which decomposes contaminants slower. Scientists have tried to combine hydrogen peroxide with iron oxide to form hydroxyl radicals that can improve the efficiency of hydrogen peroxide in a process called the Fenton reaction.

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A dispute in carrying out this process is the necessity of extra hydrogen peroxide and acid to clean filters which provokes financial and environmental costs. Utilizing the enzyme glucose oxidase is a way to eradicate these additional chemicals, which concurrently form hydrogen peroxide and gluconic acid from glucose and oxygen. Therefore, researchers combined glucose oxidase and iron oxide nanoparticles into a system that catalyzes the Fenton-based breakdown of pollutants, creating an efficient cleaning facility for membrane filters.

Customary wastewater treatment is often ineffective at eliminating contaminants like metals, microorganisms, and other impurities. Thus, researchers compared the ejection of organic contaminants from polyamide filters with the glucose oxidase enzyme and iron oxide nanoparticles to other cleaning techniques, comprising the Fenton reaction. They found this way was a major cause of the breakdown of the common pollutants while also protecting the membrane structure. The early stages were successful, which enabled further experimentation to enhance the cleaning ability of nanoparticles.

These nanoparticles were greatly effective at cleaning the membranes, observing a 94% increase in their initial water filtration capacity. As nanoparticles do not need strong chemicals and are readily recoverable, researchers opine that the new system is a greener and more cost-effective procedure for nanofiltration membrane cleaning. Nanoparticles are organized to draw water and are highly porous, soaking up water like a sponge while repelling contaminants and dissolved salts. Nano-membranes are also helpful for helping in separating impure particles from wastewater. Moreover, they are very effective in extracting dyes, heavy metals, and other pollutants.

The unique properties of nanomaterials, such as high surface area, high reactivity, and strong mechanical properties, are greatly productive and useful for wastewater treatment.

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