Since the 1980s, the disc family has gradually entered people's lives, and it has played a pivotal role in recording and storing information. It is reported that the annual output of CDs is about 200 billion, and the annual output of CDs in China is about 40 billion. China has become one of the largest optical disc production bases in the world and a major consumer of optical discs. According to incomplete statistics, CDs are eliminated by about 10% every year and are increasing year by year. In other words, China has 4 billion discs discarded in the year, and the number of discarded discs in Shanghai is about 600 million.
The optical disc is mainly composed of a substrate material, a metal plating layer, or the like. Among them, polycarbonate is the main raw material of the substrate material. This raw material is synthesized from petroleum as a raw material. It belongs to the world's scarce material, and the price per ton is as high as 16,000 yuan. China mainly relies on imports. Scrap discs can be recycled from substrate material to metal plating. After the substrate material is recycled, it can still be used as a remanufactured disc or as an outer casing for some electronic products.
The CD was born only a few decades ago, and Chinese consumers have not yet formed the awareness of recycling discs. A small number of citizens or units sell discarded discs as waste, and most people throw them directly into the trash. At present, domestic disposal methods for used optical discs are mainly landfill and incineration. Li Dengxin, a professor and doctoral supervisor at the School of Environmental Science and Engineering at Donghua University, believes that traditional landfills and incineration disposals are obviously inappropriate for special electronic waste such as discs.
According to Professor Li Dengxin, ultrasonic separation and chemical separation are relatively scientific methods for recycling used discs. They do not pollute the environment, and can effectively separate metal layers, plastic films and other materials for recycling.
In China, the cost of producing a CD is about a few cents, and a disc that is discarded for a dime by a simple recycling can be a promising business. It is reported that relevant experts have studied in detail the feasibility of recycling discs.
Today, optical discs have become a huge consumer product in the information age. With the gradual advancement of waste separation and recycling management, the disposal of used optical discs has become increasingly urgent. Zhang Chao, a tenured professor at East China Normal University, believes that when classifying garbage, it is necessary to separate the CD from the domestic garbage, otherwise it will bring inconvenience to the recycling of the enterprise. The government should set up a CD recycling system as soon as possible. It is possible to set up a disc recycling station in the community and the unit to refer to foreign practices, so that the public can release discs. It is also possible to implement the "old-for-new" system in accordance with the "who produces who recycles" and "who sells who recycles" system, and disc manufacturers and CD/VCD disc dealers are responsible for recycling discs.
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