Greenery waste refers to plants such as trees and shrubs, lawn trims, fallen leaves, branches, discarded grasses, flowers, and weeds in gardens and flower beds that are produced during the natural or conservation process of green plants in urban green spaces or suburban woodlands. Sexual material.

Types of greening waste generated.
1. Natural production: Garden plants naturally wither and form, such as fallen leaves, withered flowers and plants, and dead trees.
2. Artificial increase: plant residues produced by artificial pruning, such as grass clippings, shrub pruning, etc. The acceleration of the urban process and the continuous increase in the area of ​​urban gardens and green areas have caused more and more greening wastes, which have brought tremendous pressure to the environment.

For greening waste, the current traditional treatment methods in China are landfill and incineration, and only a small part of it is used as resources. Although the operation of landfill is simple, it occupies a large amount of land resources and is inconvenient to transport. In addition, the leachate, foul smell and landfill gas in the landfill process will cause harm to the surrounding environment, cause secondary pollution, and destroy the ecological environment. Although incineration can reduce the volume of waste, it will cause air pollution due to improper technical means and other reasons. Now some cities have clearly stipulated that the incineration of green waste is prohibited. It can be seen that for green waste with high nutritional value, these two simple treatment methods not only cause waste of resources, but also put a certain pressure on the environment, which in turn affects human health and the construction of ecological cities.

1. Organic matter coverage.
It refers to the general term for a class of substances used for soil surface protection and improvement of ground coverage. Generally, inorganic and organic coverage are used for urban green space coverage. Commonly used inorganic coverings include pebbles, gravel, etc. These coverings have low maintenance costs and are not easy to rot, but they will make the soil permeability worse and affect the growth of trees. Organic mulch is the process of crushing and processing discarded plant materials such as branches and wood chips to cover the surface of green land, under trees and shrubs.

It maintains water by increasing water permeability, water holding capacity, and reducing evaporation; it can regulate soil temperature, cool down in summer, keep warm and cold in winter, reduce the harm of frost and snow to plants; reduce soil compaction, and keep soil porous The nature and aggregate structure can effectively prevent soil erosion and soil erosion, and organic matter releases nutrients during the decomposition process, increases soil organic matter, can form a rich microbial community, and accelerates the degradation of harmful substances such as herbicides.

2. Compost.
Greening waste composting, the branches and leaves and pruned materials produced are processed and proportioned to a certain degree, and subjected to aerobic fermentation under suitable conditions to form organic fertilizers, soil amendments and flower and tree cultivation substrates to achieve reduction, The purpose of reuse and resource utilization.

3. Biomass energy.
Using biomass energy conversion technology to produce a variety of solid, liquid and gaseous new clean energy from greening waste can alleviate the continuous reduction of fossil fuels such as coal, oil, and natural gas, as well as global environmental problems such as air pollution and climate warming.

4. Wood plastic technology.
As a new material that saves wood and replaces wood, wood-plastic composite materials are developing into a new industry. Wood-plastic composite material is a new type of material that uses wood fiber or plant fiber as the main component and is processed and combined with thermoplastic resin and other materials.