At present, there are many kinds of propaganda of garbage classification widely distributed in the society. One of them is: plastic beverage bottles should be classified into three categories: bottle body, bottle cap and trademark. You agree to this "plastic bottle triad method". Way? Do you know the true recycling method of plastic bottles?
Let's first understand the material of the plastic bottle: the bottle is usually polyethylene (PE), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polypropylene (PP), polycarbonate (PC) ); the caps are mostly high density polyethylene (HDPE) or PP; the trademark is PVC or PE; the trademark adhesive is usually EVA. In fact, there are many types of plastic bottles, and it is estimated that it is only by experts!
A variety of beverage bottles
Judging from the current situation in China, plastic bottles are one of the few renewable resources that the remaining waste recycling companies are willing to market. After recycling, the plastic bottles are compressed and packaged and transported into the recycling plant. The plastic bottles, caps and trademarks of different materials are separated by manual sorting, crushed, cleaned and granulated, and finally the recycled plastic granules are sold out. Finish the roughing process of plastic recycling. The trademark part can only be reused as a low-value plastic or because it is disposed of in a waste incineration power plant because it contains printed materials.
Let's go back to the previous question, should plastic drink bottles be divided into three categories? In theory, the classification of plastic bottles according to the composition is conducive to the recycling of the back end, but the front-end points or the back-end points are very different, at least the total social cost will vary greatly.
First analyze the front-end classification. According to the type of plastic, it can be separated into bottle body, bottle cap and trademark. Since it needs to be separately placed separately, then at least three recycling bins are needed, and they need to be packaged and loaded separately. In fact, even if the caps of many plastic bottles are unscrewed, the anti-theft ring separated from the cap will remain on the bottle mouth and it is difficult to separate from the bottle body; many plastic bottle mouths also use the same plastic material as the cap, also It is also difficult to separate from the bottle body.
Beverage bottle anti-theft ring is difficult to separate
If plastic bottles of different materials such as beverages, toiletries, oil drums, etc. are all placed separately according to plastic materials, more recycling bins may need to be placed, and the investment cost and manual maintenance cost will be greatly increased, and more garbage is needed. The area of the barrel. On the other hand, it is also an impossible task to teach the residents to distinguish so many plastic types. If we consider other recyclable waste, such as waste paper, packaging, metal, glass, etc., it is a difficult to implement classified distribution method to place more than ten classified garbage bins in the limited space of the residential community!
Contrary to the above-mentioned front-end classification, recyclable garbage such as plastic bottles is put into a garbage bin at the front end. It is a simpler and more effective way to collect and collect the garbage in the terminal factory, because the recyclable garbage is relatively clean. Manual centralized sorting is feasible and the cost is the lowest. The full-time staff of the factory will more effectively classify various plastic components and carry out high-value recycling. This way simplifies the setting of the front-end trash can. It reduces the difficulty of publicizing and educating residents' wastes, and it is simpler and more reliable to implement! This classification is to combine all recyclable waste into a recyclable trash can, which is one of the important measures for the mandatory classification of waste advocated by the government.
We will go to the waste recycling station in the residential area to see the plastic bottle naturally piled up in a large volume. Direct loading and transportation will lead to high transportation costs, but it is impossible for the waste recycling station to set up compression and packaging equipment. Manually compressing measures are adopted, that is, opening the cap, manually extruding the air inside the bottle, and then screwing the cap to prevent the bottle from inflating and expanding again, so that the stacking volume of the plastic bottle is greatly reduced, and the transportation cost is reduced. The relatively large edible oil drums and the like are difficult to be manually compressed and are usually directly bundled and transported. From the above perspective, it is unreasonable to classify the bottle cap and the bottle body! It is also obviously inappropriate to call on the residents to implement the "three-point method of plastic bottles", which will lead to a substantial increase in transportation costs! From the perspective of residents participating in garbage sorting, instead of mobilizing everyone to implement the "plastic bottle triad method", it is better to mobilize everyone to flatten the plastic bottle and then screw the cap on it more!
From this analysis, it is only an ideal, or a feeling, that the front-end can distribute the recyclable garbage such as beverage bottles according to different components, but it is obviously not operational as an industry. In fact, the compulsory classification policy currently advocated by the Chinese government also classifies and recycles recyclable garbage as a category. The so-called "three-point method of plastic bottles" does not conform to China's national conditions, and it is undoubtedly a misleading work on garbage classification!
Regrettably, China's waste sorting has been practiced for so many years. The misleading sounds like this “plastic bottle triad” are always ringing. The root cause may be related to blindly following the way of promoting the classification of garbage in developed countries, especially Japan. When it comes to garbage sorting, I think that I have to learn from Japan, and even become a fashion statement. However, this view is too one-sided. It is based on the lack of knowledge of the whole process of garbage sorting, collection, recycling, and disposal. And imagine to determine the subdivision method of garbage classification.
China's waste sorting has a long way to go, and it is hoped that the promotion process will focus more on the collection and disposal of the transportation, and each type of garbage should be equipped with appropriate methods of collection and disposal. The social atmosphere of “only paying attention to classification and not caring about disposal” will only lead to waste separation work!