One of the environmental concerns of countries is the introduction of chromium into groundwater aquifers due to its destructive effects. Chromium entry to the citizen's meal or even physical contact with it will increase the risk of cancer.Therefore, in the advanced countries, industries that are related to chromium and its derivatives are controlled so that it does not enter the environment through wastewater. One of the most important applications of chromium and its derivatives is the use in the leather industry.
Our country, along with countries such as Italy, Turkey, India, Pakistan and China, is one of the largest leather manufacturers in the world. But so far no solution has been proposed for the separation of chromium from these industrial effluents, or if there is a solution, due to its high cost and lack of economic justification, it has not been welcomed by the factories. Typically, wastewater by sedimentation method Minor refinement.In some cases, chrome drainage is also collected in concrete ponds, and after evaporation, part of it is covered with another layer of concrete, which, in effect, puts a lot of costs on the unit and, in the long run, result s in a gap. In the concrete layers below, chromium enters underground aquifers. In some cities, the waste water from these industries is dumped into nearby rivers or abandoned in the desert.
A team of graduates from science and technology and Ferdowsi University of Mashhad was formed to "retrieve chromium by photocatalyst absorption from wastewater from leather factories" to solve the problem of chromium in the leather industry. This startup has been ranked among several startups after several competitions and has now been able to launch its plan.This Iranian Startup Team composed of Hohan Bakhtii, a graduate of the Master of Science in Nanotechnology Engineering from the University of Science and Technology, Pouria Paridash, a graduate of Materials Engineering from Ferdowsi University of Mashhad, Seyyed Mehdi Ghasemi, graduated in Chemistry Engineering from Ferdowsi University of Mashhad and Sina Pajaz graduated from the MSc. Industrial Engineering from the University of Science and Technology.
Sina Pajaz, a member of the Iranian nanotechnology team in a conversation with Mehr correspondent on the project, said: "Chrome is a hazardous substance in industrial waste and leather-related factories.He said that this was a very cancerous substance that could affect human genetics, and said: "That's why we came to remove chromium from these wastewater, and our startup team, which consists of graduates from different universities, was able to do this By designing the device.According to him, with the device we have designed, Chrome is absorbed into the skin of the wastewater, and after turning to chromium sulfate, it returns to the production cycle.
Referring to the benefits of the plan, he said, "The ability to absorb chromium from wastewater and convert it into chromium sulfate, a substance used in the leather industry, is possible with this device," he said. This process, in addition to separating and recovering chromium, will largely purify wastewater from chromium."This is why this device is the best use in factories and leather industry," he said, using leather chrome-based manufacturing plants to increase the consistency and skin texture.A spokeswoman remarked on the performance of the device, which was made in a startup team, said: "Each time the process of leather chroming does not absorb more than 30% of the chrome consumed and exits the system. Due to the high consumption of chromium sulfate, the concentration of chromium in the wastewater of this unit will be significant.
"The process presented by the Nanite team, in addition to cleaning the effluent of factories from Chrome and its derivatives, has the ability to retrieve and restore water, which makes the process cost-effective.The researcher pointed out to the mechanism of the device: this process separates chromium from wastewater by using the protrusion on the lateral wall of photocatalyst nanoparticles. First, nanoparticles are exposed to high-energy ultraviolet rays and are energized by the energy they produce. By passing wastewater on this surface, chromium is removed and absorbed by the surface
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