How far is the road to recycling the hottest waste

2022-08-11
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How far is the recycling road of waste plastics

as one of the three major synthetic materials, synthetic resin (plastic) is the synthetic material with the largest output and consumption. At the China synthetic resin industry development conference and 2018 new material development trend forum held in Xi'an in early November, the recycling of waste plastics became a hot topic among experts and scholars attending the meeting

waste plastics have threatened the living environment.

Du Huanzheng, President of the plastic recycling branch of China synthetic resin supply and Marketing Association and professor of Tongji University, said that the global use of plastics has increased 20 times in the past 50 years and will double in the next 20 years. It is expected that the global plastic output will reach 1.124 billion tons by 2050. At present, China's plastic production and consumption rank first in the world, of which the production accounts for 28% of the total global production

"but plastic is also a double-edged sword. Waste plastic caused by mass production and consumption has increasingly highlighted the contradiction between human economic activities and the ecological environment, and waste plastic has seriously threatened the living environment of mankind." Du Huanzheng said with concern that more than 8 million tons of plastic waste enter the sea every year, which has a serious impact on marine organisms, fisheries, tourism and even mankind itself, and the economic loss is as high as $8billion. Every year, millions of seabirds and hundreds of thousands of marine mammals die

Du Huanzheng, for example, said that the sea area between California and Hawaii in the United States has formed a "Pacific garbage island". The area of this huge "plastic vortex" garbage dump is equivalent to two Texas plus four France. After being swallowed by fish, turtles and other marine animals, these plastic wastes will produce a large number of toxins, which will eventually enter the human food chain from the bodies of marine organisms and birds

Du Huanzheng also put forward the concept of "marine PM2.5". "'marine PM2.5 'mainly comes from primary and secondary micro plastics. Plastic granular industrial products enter the sea through rivers or sewage and decompose into smaller particles under natural action, or plastic waste is broken and decomposed under the action of wind, waves, ultraviolet rays and biology." Du Huanzheng said to

the mainstream treatment method is unscientific

in terms of waste plastic recycling, the average recycling rates of waste plastics in Germany, the United States and Europe are 60%, 50% and 45% respectively; In China, it is only 25%, and about 14million tons of waste plastics are not recycled every year, resulting in a direct waste of resources of 28billion yuan

"waste plastic is a resource placed in the wrong place and has great recycling value. Therefore, it should be drained rather than blocked, and it should be recycled rather than prohibited." Wang Qi, academician of the Chinese Academy of engineering and professor of Sichuan University, said that if 15million tons of waste plastics can be recycled every year, it will be equivalent to using 30million to 40million tons of crude oil less, reducing carbon dioxide and sulfur dioxide emissions, and saving 70% of energy consumption

"at present, the commonly used recovery methods include chemical method and physical method. Through collection, rough classification and selection, simple cleaning and crushing, and finally granulation and recycling." Wang Qi said frankly, but some materials are difficult to recycle. For example, the components of blended composite polymer materials are complex, difficult to classify and separate; Crosslinked waste plastics are insoluble and non fusible, and cannot be processed by reheating plastics, so it is difficult to reprocess and reuse. At present, the total amount of waste plastics in the world is 6.3 billion tons, only 9% of which are recycled, 12% are incinerated, and 79% are buried or accumulated in the natural environment, which not only seriously pollutes the environment, but also extremely wastes resources

Du Huanzheng said that the current methods of waste plastic landfill and incineration are unscientific, wasting resources and damaging the environment. China's waste plastic recycling faces problems such as the serious lag of classification recycling, the operation mode of recycling these five axis 3D printers is also different from our common 3D printers, and so on. After all, the legislation of recycling and treatment of fatigue plastic waste needs to be strengthened and improved, and the systematic recycling system also needs to be established

it is reported that the new technology and equipment of solid-phase shear milling developed by the State Key Laboratory of polymer materials engineering of Sichuan university can efficiently recycle waste plastic and rubber, turn waste into treasure, and make full use of resources. At present, it is being industrialized and popularized

technology and business models need to be innovated

Wang Qi told that waste plastic pollution must be treated in an all-round and all-round way through policy guidance, enhancing citizens' awareness of environmental protection, establishing an effective recycling mechanism and other measures in the synthesis, processing, application, waste treatment and other links

Du Huanzheng also believes that the recycling of waste plastics needs to create new policies, and it is easy to create complex shapes, technologies, and business models. Through reduced use, resource recycling, and biomass substitution, zero waste of plastics can be achieved. He suggested that the establishment of producer extension system (EPR), that is, producers bear the resources and environment for their products, extending from the production link to the whole life cycle of product design, circulation and consumption, recycling, waste disposal and so on. EPR can connect enterprises, governments, consumers and other relevant stakeholders, clarify the rights and responsibilities between the main body and the implementation of "made in China 2025", and play a positive role in promoting the development of waste classification and resource recycling industry

it is reported that China has listed the recycling of waste polymer materials as a strategic emerging industry, and issued the medium and long-term plan for the construction of renewable resources recycling system (2015-2020), the solid waste pollution prevention and control law (2018), etc. The industrial standard conditions for comprehensive utilization of waste plastics issued by the Ministry of industry and information technology determines the entry threshold for three categories of enterprises, among which the annual waste plastic treatment capacity of new enterprises of pet recycled bottles and chips is not less than 30000 tons; The annual waste plastic processing capacity of waste plastic crushing, cleaning and sorting new enterprises shall not be less than 30000 tons; The annual waste plastic treatment capacity of new enterprises of plastic recycling and granulation is not less than 5000 tons. In terms of resource utilization, the comprehensive power consumption of production links related to plastic recycling and processing is required to be less than 500 kwh/ton of waste plastics, the comprehensive water consumption of PET recycling bottle chip enterprises and waste plastic crushing, cleaning and sorting enterprises is less than 1.5 tons/ton of waste plastics, and the comprehensive water consumption of plastic recycling and granulation enterprises is less than 0.2 tons/ton of waste plastics

the Interim Measures for the administration of the announcement of standard conditions for the comprehensive utilization of waste plastics industry issued by the Ministry of industry and information technology stipulates that enterprises that do not meet the requirements of the standard conditions will be ordered to rectify within a time limit, and enterprises that refuse to rectify or rectify will be disqualified

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