The use of agricultural plastic film in China passed the initial "white revolution" and caused serious "white pollution". Unscientific handling methods completely broke the problem of residual film pollution. At present, our country has carried out active control and prevention in succession and confronted with the difficulties faced in disposing of agricultural plastic sheeting and went to a "battlefield" of environmental protection with a stronger stance. Â Residual membrane mechanization recovery technology bottleneck case how to use resources into the problem China's land area ranks third in the world. The vast result is the uneven development of agriculture. That is why, after more than 30 years of development, agricultural plastic film has become one of the most important agricultural technologies in our country. The role of plastic film mulching in warming, water conservation, fertilizer conservation, crop growth and development and increasing output can not be ignored. However, the "white revolution" has also led to the negative production of "white pollution." Â Wide range of use of plastic film residual membrane pollution hidden dangers According to public figures, there are more than 200 million mu of land covering mulch in our country today, with a consumption of one million tons. The market scale of the plastic film industry is expected to reach 500 billion yuan by 2017. In recent years, China's plastic film production is still growing, is expected in 2017 output will be about 19,587,600 tons. Behind such a huge amount of data not only represents the agricultural plastic membrane market is booming, but also on behalf of the improper handling of plastic sheeting if its environmental impact will be how shocking. However, the use of agricultural plastic film is indeed worrying nowadays. Discarded, simple landfill, mixed incineration and so on cause serious pollution and even affect the atmosphere, water and soil environment. Discarded readily discarded as a "white trash"; landfill degradation is difficult, decomposition and release of harmful substances; without any protective measures will lead to harmful gases flow into the air; residual film in the soil will also give the next Planting crops planted hidden dangers. According to one study, yields of wheat, corn and cotton decreased by 17.8%, 13.2% and 16%, respectively, when the amount of residual film in the soil reached 120 kg ha -1. Â Waste plastic sheeting is facing problems Large-scale use of agricultural plastic film, unscientific treatment of pollution accumulated over time, the type of arable land in our country added a new type of agricultural pollution, pollution control has also been written into the list of specific actions of agricultural non-point source pollution control by Countries and places attach great importance. However, the disposal of waste plastic sheeting also has its own problems, breaking through the difficulties of recycling and improving the resource-based integrated recycling system is of utmost importance. The use of plastic sheet to increase the difficulty of recycling. In 1992, the minimum standard for the agricultural film thickness stipulated in the production standard of "polyethylene blow-molded agricultural floor covering film" (GB13735-92) was 0.008mm, which allowed to float up and down by 0.003mm. In contrast, the overseas standard of 0.012-0.015, China's residual film cleaning and recycling of natural more difficult. Waste plastic sheeting has low recovery efficiency. High recovery costs, high re-use costs, the sum of any two is equal to the benefits of waste plastic sheet reuse. In order to recover the residual film processing drip irrigation tape, for example, the cost of raw materials 0.09 yuan / m, recycling processing costs are as high as 0.15 yuan / m. Without the benefit of the market to follow the principle of profit and avoid disadvantages, of course, can not stimulate the enthusiasm of enterprises to recycle, and rely on the government clearly can not solve the problem of virtuous circle and sustainable development. Mechanized recycling technology encounter bottlenecks. Although the utilization of agricultural plastic film in our country has been for decades, the development of residual film recovery technology is still in a groping period. The potential of the market is large. It is not easy to break through the bottleneck. The complexity of the use of agricultural film so that a single type of recovery efficiency of the machine, the usefulness of small, complex model development and at the bottleneck, it is also virtually increase the difficulty of recovery. Propaganda efforts need to be strengthened. Pollution needs from the source, to solve the "white pollution" problem also requires users to make a good start. The use of mulch film in agriculture should keep pace with the times. The new environmentally friendly degradable mulch film gradually optimizes quality and reduces costs, making it a more favorable choice in today's agricultural production. Local authorities should step up publicity efforts and diversify channels of popularization so that more farmers will adopt more environmentally-friendly agricultural plastic film products and strengthen practitioners' awareness of recycling and environmental protection so as to solve problems rooted in their roots. It is true that the disposal of waste plastic sheeting has long plagued environmental protection. However, the market for plastic sheeting in our country has shown a shortage of high-tech films. The recycling system is gradually being improved and the national policy tends to support people's environmental awareness at a visible rate Enhanced. We have every reason to believe that the "gospel" of discarding plastic sheeting is at the front and the direction of ecological construction has never been lost in the context of the lifting of the banner of environmental protection.
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Residual membrane mechanization recovery technology bottleneck case how to use resources into the problem