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Practice and Countermeasures of waste agricultural film recycling

In recent years, with the popularization and application of agricultural plastic film mulching cultivation technology, relying on its unique advantages, it has become the fourth largest agricultural means after seeds, pesticides and chemical fertilizers. Incomplete recycling is also one of the main causes of land pollution in rural areas. With the increasing use of agricultural film in recent years, the problem of pollution also follows.

At the beginning of this year, China Agricultural Technology Promotion published a paper by Zhao shaoting and Han Yanni on the practice and Countermeasures of waste agricultural film recycling in Shanxi Province, which analyzed the use of agricultural film, the practice of agricultural film recycling and utilization, and the coping strategies.

Today’s excerpts are for readers, hoping to help practitioners in the plastic recycling and recycling industry to seek business opportunities.

1 overview of the use of agricultural film

In 2018, the use of agricultural film was 2.465 million tons, the use of plastic film was 1.404 million tons, and the covered area of plastic film reached 266 million mu, which decreased by 2.5%, 2.3% and 4.8% respectively compared with 2017 [4]. In 2018, the use of agricultural film in Shanxi Province was 49100 T, the use of plastic film was 31100 T, and the plastic film coverage area reached 8.88 million mu [4], accounting for 2.0%, 2.2% and 3.3% of the total use and coverage area of the country respectively. Although Shanxi Province is not a key province in China in terms of agricultural film, plastic film usage and plastic film coverage area, affected by geographical and climatic conditions, the central and northern cold climate areas have concentrated plastic film coverage area, large amount of plastic film coverage and long time of plastic film coverage.

2.Practice analysis of agricultural film recycling and utilization

2.1 recovery methods of agricultural film

At present, the plastic film used in developed countries such as Europe, America and Japan is relatively thick, generally 0.015 mm, which is mainly recycled mechanically by the roll up recycling machine [2] the plastic film used in China is generally thin, generally equal to or less than 0.01 mm, which is easy to be damaged in agricultural operation, and the recycling is difficult, mainly by manual recycling.

2.2 recycling technology of waste agricultural film

At present, the main treatment methods of waste agricultural film in the province include recycling of raw materials, mixed fuel utilization of straw scale and agricultural film, and disposal in rural waste treatment system.

Whether the recycled agricultural film can be reused is related to the degree of breakage and cleanliness of the waste agricultural film. The recycling technology of waste agricultural film mainly adopts wet granulation processing technology. Wet granulation is a commonly used recycling technology [9], which mainly includes crushing, cleaning, dehydration, melting granulation and other technical links. The main equipment includes crushing, cleaning, drying, extrusion, pelleting and other machinery. The cost of producing 1 t recycled plastic particles from waste agricultural film is about 3500 yuan.

2.3 operation mode of agricultural film recycling and utilization project

Through the implementation of the pilot project of agricultural film recycling and utilization in Shanxi Province, the recycling enterprises of waste agricultural film are supported, the collection and storage stations and recycling outlets are established, and the farmers and recycling organizations are driven to recycle agricultural film. The operation mode of “processing enterprises + recycling outlets + farmers” is formed in the project area, and the recovery rate of agricultural film is significantly improved.

2.4 main problems

The awareness of source prevention and control needs to be improved;

The awareness of environmental protection law needs to be strengthened;

The supporting agronomic measures need to be improved;

The recycling capacity of waste membrane needs to be strengthened.

3.Recovery and utilization of agricultural film

We should continue to strengthen policy promotion;

The key to promote the recycling of agricultural film is to cultivate the main body of the recycling market of agricultural film;

The recycling system of waste agricultural film should be improved according to the principles of “who produces, who recycles”, “who uses, who recycles” and “who sells, who recycles”;

Explore the new mechanism of recycling and utilization with the progress of the rule of law;

Overall improvement of supporting agronomic measures;

Propaganda and guide the masses to change their ideas, and strengthen the propaganda of laws, regulations and policies such as the law on the prevention and control of soil pollution and the measures for the administration of agricultural film.

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