Current situation and treatment technology of the

White pollution status quo and treatment technology (IV)

⑴ provincial recycling (volume reduction, reduction)

provincial recycling, namely volume reduction, reduction, is to reduce or inhibit the production of plastic waste, including less use, can be used, and can be used as little as possible; Or by filling natural organic or inorganic materials, reduce the amount of plastic, not only save limited resources, but also reduce pollution; Or reduce the consumption of disposable plastic packaging by improving product quality, increasing functions, prolonging service life and using one thing for multiple purposes; Thinning, that is, under the premise of ensuring the application performance, by changing the formula of raw materials and product structure design, the product can be lightweight and thin-walled; Reduce 5.1 dimensional deviation and appearance capacity, that is, reduce the volume of plastic waste by compaction, dissolution, defoaming and other methods, and develop appropriate packaging to curb excess packaging. The above measures can not only reduce the consumption and time of raw materials, but also reduce the amount and volume of garbage, and then save energy consumption in the process of production and transportation. This is the main measure to control environmental pollution, but also a good way to prevent problems from happening and start from the source

⑵ reutilization (recycling)

reutilization, that is, recycling, is not only a technical problem, but more importantly, it includes a complete set of system engineering problems from legislation, recycling, production, inspection, sales and so on. It is an effective method that countries actively develop to ensure the sustainable development of national economy and the coordination of economy, resources and environment. In general, a considerable part of plastic waste is easy to recycle. However, for disposable plastic waste, it must be recycled as much as possible according to the types, quality, quantity, flow direction and treatment methods of waste everywhere, which are easy to recycle, have recycling value and cost-effective, including materials, heat energy, fuel oil, chemicals, etc., which is not only conducive to environmental protection, but also of great significance from the perspective of saving the earth's limited resources and effectively utilizing renewable resources. However, at present, recycling will face many technical and economic problems in terms of waste classification, collection, the establishment of recycling system, the research and development of efficient recycling technology and equipment, and the product direction of recycled materials, which need to be studied and solved by the government and the private sector through increased scientific and technological investment and joint cooperation

⑶ harmless (degradable)

in real life, there are many disposable plastic wastes that are difficult to collect, such as compost bags, garbage bags, light plastic packaging bags for supermarkets and morning markets, or even if the collection is forced, the economic benefits are poor or even unproductive, such as Chinese tableware, mulching film, etc. it is more suitable to use degradable plastics in these fields. After nearly a decade of follow-up application practice, it has been proved that the degradable plastics developed in China have the following characteristics: ① practicality: its application performance and sanitary performance are similar or equivalent to ordinary plastics; ② Degradability: after completing the use function, it can degrade rapidly under natural environmental conditions and become harmless fragments or debris that are easy to be absorbed by the environment; ③ Safety: the substances produced in the degradation process and the residues after degradation are harmless to the environment or have no potential harm; ④ Economy: the price is equal to or slightly higher than that of similar ordinary plastic products. The representative degradable plastics in China are the starch based Biodegradation Technology and series of products developed by Tianjin Danhai Co., Ltd. at present. Its process characteristics are vacuum dehydration of starch in liquid state, micronization and hydroxyl modification technology. The technology is at the leading level in China and has independent intellectual property rights. The starch content in the film can be as high as 50%, and the seedling bowl and injection molding products can be as high as 80%, which means that the products not only have good biodegradability, but also can save oil resources and reduce plastic waste by more than half, which is in line with the principle of saving resources and starting from the source. In addition, due to the addition of a large number of starch and degradation promoting additives, its waste is conducive to garbage composting treatment, which is a unique way of recycling, Conform to the measures of re resource. Therefore, according to domestic and foreign experience, for those disposable plastic products that are large, scattered, dirty, difficult to collect or even economically unreasonable to be forcibly collected, it is considered to be the best choice to recommend the use of degradable plastics, which can be degraded and broken into harmless fragments in a short time, so as to achieve the performance indicators of plastic waste volume reduction, reduction, and reduction or inhibition of the strength of ring reaction metal materials. There are the following purposes of environmental pollution, With the passage of time, the force value of the sample that can be completely degraded back to the standard tension is between 60% and 90% of the full-scale force value in this range, which is natural

the state has issued Order No. 6, requiring that the production and use of polystyrene tableware be prohibited before the end of 2000. Therefore, many provinces, cities and departments are strengthening the research and development of various alternative products, such as cardboard tableware, pulp molded tableware, plant fiber molded tableware, starch expanded tableware, light/biodegradable polypropylene tableware, starch filled polystyrene foamed tableware, light/biodegradable polystyrene foamed tableware, and starch Plant fiber and fully biodegradable plastic polycaprolactone are mixed with foamed tableware, aliphatic polyester fully biodegradable plastic coated natural material tableware, etc. under the temptation of tax preferential policies. Both have made progress to varying degrees, but there are also some problems that need to be further improved and improved, which is in line with the development law of new products. However, no matter which type of products must be based on reality, comprehensively evaluated around technology, performance, market, price, environmental protection and other factors, and then tested and identified by the market in combination with macro policy guidance

degradable plastics, as high-tech products and environmental protection products, have become a research and development hotspot of great concern in the world today. Its development not only expands the functions of plastics, but also alleviates the contradiction of the environment to a certain extent. It is also a supplement to the increasingly exhausted oil resources, and shows the power and Prospect of bioengineering and alloying technology in the field of plastic materials from the perspective of synthetic technology, Therefore, the research, development, popularization and application of degradable plastics are of great significance, whether from the practical point of view of the earth's environmental protection, from the inexhaustible renewable resources, or from the academic field of synthetic functional polymers and medical polymers. The research and development of degradable plastics is in the ascendant and has a long way to go