What are the disadvantages of using nanomaterials in water and
wastewater treatment?
Kindly refer...
Article An Overview of Nanomaterials for Water and Wastewater Treatment
Although nanomaterials have unique properties due to their surface to mass ratio, their separation from treatment media is difficult using simple methods. This problem can be solved by using magnetic nanoparticles or by using a suitable support material.
Yes, the main problem is with their separation but also re-usability, they get polluted/deactivated during the process.
regards,
GB
One of the most important advantages of nanomaterials, when compared with conventional water technologies, is their ability to integrate various properties, resulting in multifunctional systems such as nanocomposite membranes that enable both particle retention and elimination of contaminants. Further, nanomaterials enable higher process efficiency due to their unique characteristics, such as a high reaction rate.
However, there are still several drawbacks that have to be negotiated. Materials functionalized with nanoparticles incorporated or deposited on their surface have risk potential since nanoparticles might release and emit to the environment where they can accumulate for long periods of time. Up until now, no online monitoring systems exist that provide reliable real-time measurement data on the quality and quantity of nanoparticles present only in trace amounts in water, thus offering a high innovation potential. In order to minimize health risks, several national and international regulations and laws are in preparation. Another more technical limitation of nanoengineered water technologies is that they are rarely adaptable to mass processes, and at present, in many cases are not competitive with conventional treatment technologies. Nevertheless, nanoengineered materials offer great potential for water innovations in the coming decades, in particular for decentralized treatment systems, point-of-use devices, and heavily degradable contaminants.
Further studies are still needed to address the challenges of nanomaterials. Up to now, only a few kinds of nanomaterials have emerged commercially. Since low production cost is crucial to ensure their widespread applications in water and wastewater treatment, future research should be devoted to improving the economical efficiency of nanomaterials. Besides, with increasingly extensive applications of nanomaterials in water and wastewater treatment, there are growing concerns about their potential toxicity to the environment and human health. Available information in the literature has revealed that several nanomaterials may have adverse effects on the environment and human health]. Nevertheless, standards for assessing the toxicity of nanomaterials are relatively insufficient at present. Hence, a comprehensive evaluation of the toxicity of nanomaterials is in urgent need to ensure their real applications. What is more, the evaluation and comparison of the performance of various nanomaterials in water and wastewater treatment are still short of uniform or recognized standards. It is difficult to compare the performances of different nanomaterials and figure out promising nanomaterials that deserve further development. Therefore, the performance evaluation mechanism of nanomaterials in water and wastewater treatment should be perfected in the future.
Regards
Nano materials may have significant drawbacks if they are applied to plant processes where flow streams are employed. If the nano materials are catalytic or recyclable as discussed earlier by Abdelazeem and Grzegorz such applications will necessarily have to incorporate some type of recovery process, to prevent loss of the materials through precipitative clogging or with effluent discharge. Such losses will retard flows or if discharged could impact the environment.
These limitations may be more easily overcome if the nano materials are employed in batch treatment processes. In batch treatment microfilters can be utilized once the treatment is completed. After recovery the filtered catalyst or microparticles can be regenerated or reused limiting environmental impacts. We have looked at such applications using self regenerating, doped zeolite and aerogel surfaces for storm water cleanup.
Regards.
The answer is simple. They are so small particles that it is not known to date how to remove them from the water. Thus, only in the water increases the content of particles that are dispersed in the water and we do not know their effects on humans, and other living plant and animal organisms. This is not the way to the future.
I think you can find answer from there
https://www.ijedr.org/papers/IJEDR1604053.pdf
Kindly refer...
Article An Overview of Nanomaterials for Water and Wastewater Treatment
https://www.researchgate.net/post/What_are_the_disadvantages_of_using_nanotechnology_in_water_and_wastewater_treatment
Dear Sir
Please Check the following citations which may be useful for you
Article Innovations in nanotechnology for water treatment
- Large surface area to volume ratio makes them effective catalysts
- So small they can enter the skin and therefore the bloodstream
- Nanoparticles in sun creams can be absorbed deeper into the skin
- Large surface can make them too reactive and explosive in some situations
- Easily become airborne, breathing in can potentially damage the lungs
- Changes the properties of a material
- Nanoparticles in face creams cover better so you have to use less
- Sun creams that use nanoparticles are transparent while traditional ones are white
- They might be toxic to some types of cell, such as skin, bone, brain and liver cells
https://smallbusiness.chron.com/advantages-disadvantages-nanotechnology-37398.html
Dear Mutasem Z. Bani-Fwaz,
Current research in nanotechnology offers the possibility of developing technically and economically viable alternatives to conventional wastewater treatment. Nanocatalysts can effectively be used for chemical oxidation of organic and inorganic pollutants in water in advanced oxidation processes (AOP). Biggest drawback for nanaocatalysts is the high operating cost of providing the required light energy (UV radiation), which is why this technology is still not considered to be economically viable. It also has its own disadvantages, such as aggregation, oxidation, and separation difficulty from the degraded system.
Disadvantages
Example
1. A disadvantage of bactericidal nanoparticles in general except for nano-TiO2 is that no bactericidal substances such as hydroxyl radicals remain in the water past the contact time that could ensure the water quality in storage and distribution devices (depot effect).
2. The stability is depending on the essential chemical resistance which applies for material cleansing. The disadvantages are less reliability, slow operation process, less selectivity; high maintenance cost and working efficiency reduce with passage of time. There are some common disadvantages that is why it is not extensively explored.
Ashish
Dear Mutasem Z. Bani-Fwaz,
Current research in nanotechnology offers the possibility of developing technically and economically viable alternatives to conventional wastewater treatment. Nanocatalysts can effectively be used for chemical oxidation of organic and inorganic pollutants in water in advanced oxidation processes (AOP). Biggest drawback for nanaocatalysts is the high operating cost of providing the required light energy (UV radiation), which is why this technology is still not considered to be economically viable. It also has its own disadvantages, such as aggregation, oxidation, and separation difficulty from the degraded system.
Disadvantages
Example
1. A disadvantage of bactericidal nanoparticles in general except for nano-TiO2 is that no bactericidal substances such as hydroxyl radicals remain in the water past the contact time that could ensure the water quality in storage and distribution devices (depot effect).
2. The stability is depending on the essential chemical resistance which applies for material cleansing. The disadvantages are less reliability, slow operation process, less selectivity; high maintenance cost and working efficiency reduce with passage of time. There are some common disadvantages that is why it is not extensively explored.
Ashish
Dear Mutasem Z. Bani-Fwaz
This article may helps you
https://doi.org/10.1155/2016/4964828
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