PFAS-free water treatment plant in harmony with nature
PFAS removal equipment business
Clean water for the future.
We will realize a PFAS-free society.
PFAS removal using a combination of ozone and activated carbon treatment
By complementing the strengths of each technology, we achieve high efficiency and economy that cannot be achieved by a single process.
This is a cutting-edge water treatment plant that has been installed in a variety of locations, including public park ponds, industrial wastewater, and groundwater.
What are PFAS?
PFAS - Forever Chemicals
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PFAS (Peri-Fas) is a general term for organic fluorine compounds that have properties such as water repellency, heat resistance, and stain resistance, but are also considered problematic as hazardous substances that are hardly decomposed in nature.
There are concerns about contamination of drinking water and groundwater, and regulations are being strengthened both domestically and internationally.
Technology and Mechanism
Water treatment plant technology to remove PFAS
Our water treatment plants efficiently remove PFAS through a three-stage process of adsorption, decomposition, and separation.
By combining activated carbon, ion exchange resins, and advanced oxidative decomposition technology, we are able to improve the safety of treated water.
Main advantages of combined processing
1.Improved adsorption efficiency and lifespan of activated carbon
Reducing organic matter load
PFAS-contaminated water also contains organic matter other than PFAS (such as DOM).
Ozone oxidizes and decomposes these organic substances, so by introducing ozone as a pretreatment for activated carbon,
Reduces the number of substances other than PFAS that can be adsorbed, improving adsorption performance.Suppression of competitive adsorption
Suppresses "competitive adsorption," in which PFAS and other organic matter compete for adsorption sites.
Activated carbon is more efficient at capturing PFAS, which is its intended purpose.Reduced replacement frequency and costs
The reduced organic load extends the time until activated carbon is saturated,
Reducing the frequency of replacement leads to reduced operating costs.
2.Improved stability of PFAS removal
Activated carbon has a very high adsorption capacity for long-chain PFAS such as PFOS and PFOA.
Stabilizing water quality through ozone pretreatment allows the activated carbon to always operate under optimal conditions, maintaining stable PFAS removal performance.
3. Possibility of partial structural changes in PFAS (limited)
It is difficult to completely decompose PFAS using ozone alone.
Some studies suggest that ozone may oxidize and shorten the side chains of PFAS molecules .
This change may also have a favorable effect on the activated carbon adsorption behavior in the subsequent stage.
(*This is not a major effect and does not result in complete decomposition.)
4. Flexibility of the treatment process
In addition to PFAS countermeasures, ozone treatment
Sterilization
Deodorization
It can also be used to improve water quality in many ways, such as reducing turbidity.
This allows for the creation of a flexible treatment process that can address other water quality issues while also removing PFAS .
Points to note
Ozone alone has limited effect on PFAS degradation
Although it is a powerful oxidant, its ability to cleave the C–F bonds and completely degrade PFAS is limited.
The purpose of this combined treatment is to "maximize the performance of activated carbon."Limitations of short-chain PFAS
Activated carbon does not adsorb short-chain PFAS (e.g., PFHxA, PFBS, etc.) well.
Since dramatic improvement cannot be expected with ozone pretreatment,
If short-chain PFAS are the main target, consideration should be given to using it in combination with reverse osmosis membranes (RO) or ion exchange resins .Increased facility and operational costs
As combined processing becomes more sophisticated, the initial investment and operational management become somewhat complicated.
summary
The combination of ozone treatment and activated carbon treatment is
Maximizing the PFAS adsorption capacity of activated carbon
This is an effective and economical PFAS countermeasure technology that extends the life of activated carbon and reduces operational costs.