Why is it said that the basic properties of waste household appliances are resource and pollution?
Various materials used in the production process of household appliances, including non-ferrous metals and related materials, polymer materials such as resin, ferrous metal materials such as steel, etc., embody a large amount of human labor and consume a large amount of resources. The material properties of these substances do not change much before and after the home appliances are scrapped. What changes are only the usage properties of the materials, including photoelectromagnetic properties, the appearance of the materials and people’s perception. It is for this reason that after old household appliances are scrapped, people are trying to use and recycle these valuable materials, such as using household appliance shredders to process these old homes first, which is very necessary to promote resource recycling. However, how to recycle valuable materials in used household appliances in an environmentally friendly manner has become a difficult problem.
Because the types of materials used to manufacture electronic components or parts in household appliances range from dozens to thousands, more than half of which are harmful to human health and the surrounding environment, such as heavy metals such as lead and copper in circuit boards and Australian Chemical flame retardants, lead oxide and copper in display cathode ray tubes, aluminum in flat screen displays, copper and aluminum in batteries, PCBs in capacitors and converters, refrigerants and foaming agents in refrigerators, etc. . When people reuse materials related to waste home appliances, if they cannot adopt scientific and suitable technology and related equipment, the utilization rate of precious resources such as non-ferrous metals will be very low, and serious secondary pollution will be produced. This is pollution from waste home appliances. What sex is really about. Therefore, from the perspective of protecting resources and the environment, before the relevant recycling processes and technologies meet the requirements for resource utilization and harmless disposal of waste home appliances, properly storing waste home appliances is a good way of disposal.
What materials are used in waste household appliances and what are their hazards?
Waste household appliances include scrap household appliances and old household appliances. Waste household appliances refer to household appliances that have lost their functions and performance standards; old household appliances refer to those that have not been repaired or have been repaired under economically reasonable conditions, and have been tested to meet the safety standards and performance standards of old household appliances, and can be continued to be sold and used as second-hand goods. Home appliances. Waste household appliances contain a large number of toxic, harmful and dangerous substances, mainly including lead, pavement, soft steel, aluminum, Australian flame retardants, Freon, PVC plastics, etc. In addition, household appliances naturally contain other heavy metals and halogen chemicals, such as cast iron, silver, copper, zinc, etc. If used household appliances are discarded at will or disposed of improperly, they will become “environmental killers” that harm the human living environment, polluting soil, water sources, air, animals and plants, and causing serious harm to human health and life safety. Therefore, in an environmentally friendly scientific way, such as using renewable resource equipment such as household appliance crushers, to reasonably dispose of eliminated or scrapped household appliances, it is important to protect the natural environment on which human beings depend, the production and production of household appliances. The virtuous cycle of use is very important to promote the sustainable development of mankind.
Among the thousands of chemical raw materials used to produce a household appliance, about several hundred are substances that are highly toxic to the human body and destructive to the environment. After household appliances are discarded, if these materials are not properly disposed of, they will be extremely harmful to the environment. For example, a TV set contains about 1kg of lead in the cathode ray picture tube, which is mainly present in the glass of the picture tube. If the waste glass is disposed of by burying, the lead and other heavy metal elements in the waste glass will slowly penetrate into the soil. , the lead content in various plants (including crops) grown from these soils will be greatly increased. In addition, many organic materials (including plastics) used in the manufacture of household appliances must undergo chlorination, oxidation and sulfonation. If these materials are simply incinerated, a large amount of harmful waste gas will be released, destroying the atmospheric ozone layer and forming acid rain. Other metals such as barrels, iron, iron and other metals found in related parts of household appliances cause the same serious pollution to the environment as lead.
What are the hazardous substances in electronic waste?
At present, electronic waste increases by 16% to 28% every five years, which is three times faster than the growth rate of total waste. Electronic waste is becoming a new source of hazardous waste pollution. A report released by the United Nations Environment Program pointed out that the amount of e-waste generated in our country every year is 2.3 million tons, second only to the 3 million tons in the United States. According to Reuters, e-waste generated by computers in China and South Asia will increase fourfold compared to 2007. I really don’t have the courage to imagine that in a few years, the blue earth will become the desolate garbage dump in “Wall-E”. E-waste is a collection of poisons. For example, a 15-inch CRT computer monitor contains harmful substances such as cadmium, mercury, hexavalent chromium, polyvinyl chloride plastic and brominated flame retardants. Computer batteries and switches contain chromium compounds and mercury, and computer components also contain Arsenic, mercury and many other harmful substances; electronic products such as televisions, refrigerators, and mobile phones also contain heavy metals such as lead, chromium, and mercury, and laser printers and copiers contain carbon powder.
If used electronic products are discarded as general garbage in wilderness or landfill areas, the heavy metals such as lead contained in them will penetrate into the soil and pollute the water quality, and circulate through the food chain of plants, animals and humans, causing poisoning incidents; if Burning it will release a large amount of harmful gases such as dioxin, which threatens human health. Therefore, these substances should be processed first with renewable resource equipment such as household appliance shredders. Not only that, on the one hand, the accumulation of large amounts of electronic waste has seriously polluted the soil, rivers, groundwater, and atmosphere, endangering human health; on the other hand, the large-scale mining of mineral resources used in the production of electronic products has led to the continuous occurrence of geological disasters and the destruction of the mine environment. The increasing shortage of mineral resources and mineral resources has caused a series of problems in resource-depleted cities, and the large accumulation of electronic waste has caused a serious waste of resources.
