|Waste water treatment|
All described properties of Fe(0) nanoparticles can be even used for decomposition of pollutants contained in the waste water, mainly for treatment of industrial sewage and hutch water. The usage of nanoiron can represent a significant qualitative step in the classical technologies of water treatment including drinking water. The extremely reactive iron nanoparticles thus offer a possibility to solve long-lasting problems with a high content of uranium and arsenic in a variety of localities in the Central Europe. They can be also used for a reduction of the content of heavy metals, nitrates and phosphates in the drinking water. Just these inorganic pollutants, which are hardly or expensively removed by standard technologies, are effectively removed by Fe(0) nanoparticles. Although this field of usage of zero-valent iron is in its early stage for the present, in forthcoming years, we can expect a boom of their application in the area of waste water. Beside significant decontamination effect, their advantage relies on the formation of non-toxic product of oxidation of nanoparticles (very often Fe3O4), which is either deposited in the given locality and almost negligibly increases the natural occurrence of iron oxides or comes to filtration devices of cleaning units. In order to utilize these Fe(0) nanoparticles in the treatment of waste water, NANO IRON, s.r.o. company developed NANOFER 25 product which exhibits a large surface area along with an extraordinary reactivity in contact with pollutants. Thus, this product simultaneously acts as a solid sorbent, which may bind colloidal and solid impurities contained in the water.
Demonstration of high reduction efficiency of NANOFER 25 product on the sample of the sewage water coming from the dyeing process from the textile industry. Left: blank sample, 3 commercial samples containing different forms of microcrystalline iron in concentration of 20 g/l and NANOFER 25 in concentration of 5 g/l.