Electronic products have promoted the progress of human society, but e-waste has become a disaster, endangering the global environment and human health. However, the innovative method of cryo-pulverization of e-waste newly invented by scientists recently is how to treat e-waste more environmentally friendly than traditional methods of landfill, incineration, and chemical treatment.
What is e-waste?
Generally speaking, it refers to discarded or eliminated household appliances such as refrigerators, air conditioners, washing machines, televisions, etc., or electronic devices such as computers, mobile phones, mobile power supplies, batteries and so on .
a. Environmental pollution
It is a serious fact that e-waste can cause serious environmental pollution. Many electronic components contain substances harmful to the human body, including toxic chemicals and heavy metals such as mercury, arsenic, chromium, lead, chromium, brominated flame retardants, antimony, bismuth, phosphide and the like.
If e-waste is not properly disposed of, it will cause serious harm to human health and bring about various diseases such as cancer. Especially for some developing countries, some places tend to over-emphasize economic interests, but do not pay attention to environmental protection. While people are getting rich profits, they also suffer from the bitter consequences of environmental pollution.
b. Garbage disposal
At present, the general treatment methods for electronic waste are “landfill, incineration, chemical treatment”.
Landfill refers to the dumping of electronic waste into the filling site for landfill disposal. However, heavy metals in e-waste may penetrate into soil, rivers and groundwater, causing pollution of local soil and groundwater, and endangering the health of local residents and living things.
Incineration refers to the method of burning electronic waste by fire at high temperature to remove metal and other organic components. The incineration process is also very harmful to the environment. Organic matter incineration will release a large amount of harmful gases, such as highly toxic dioxins, furans, polychlorinated biphenyls and other carcinogens.
Chemical treatment refers to the introduction of e-waste into an acidic or alkaline liquid. The leachate is then subjected to a series of processes such as extraction, precipitation, displacement, ion exchange, filtration and distillation to finally obtain a high-grade metal.
However, in the process of chemical treatment, the use of strong acid and highly toxic fluoride, etc., will generate a large amount of waste liquid and emit toxic gases, which is also harmful to the environment.
Because it is well known that these treatments have a common flaw, which is a serious pollution of the environment. In order to replace traditional methods such as landfill, incineration, and chemical treatment, the University of Rice and the Indian Academy of Sciences recently proposed an innovative and environmentally friendly solution: “Crushing electronic waste into nano-dust.”
A postdoctoral researcher at Rice University, a researcher at the Indian Academy of Sciences in Bangalore, Chandra Sekhar Tiwary, a material scientist, Pulickel Ajayan, a professor of the Indian Academy of Sciences, Kamanio Chattopadhyay, and DP Mahapatra, published a paper in Today’s Materials magazine. Electronic waste treatment process.
the electronics is through the shredding and crushing system processing , the eddy current separator and electrostatic separator machine used into this system solving this problem with higher efficient and environment friendly .