Generally speaking, there are four colors of classified trash cans. One is a special color, yellow, which is specially used to hold medical waste. Classified trash cans of this color are only seen in hospitals. .
1. Red: represents harmful substances, sometimes also marked in orange. Hazardous substances include waste batteries, fluorescent tubes, paint, expired drugs, cosmetics and other substances that are not recyclable and carry certain pollution hazards.
2. Green: In the case of various combinations of plastic trash cans, green represents kitchen waste. Kitchen waste can be used as fertilizer for plant nutrients. After being buried in the soil, it can be decomposed by natural microorganisms and plants. Absorb and play the role of waste reuse.
3. Blue: represents recyclable garbage, including plastics, paper, metals and other valuable materials. These materials will be included in the waste recycling system for resource recycling and disposal.
4. Gray: In addition to garbage other than hazardous substances and recyclable materials, waste that is difficult to recycle, such as bricks, ceramics, and dirt, is generally incinerated, buried, etc.
5. Yellow: represents a special trash can for medical waste, which is generally only used in medical places such as hospitals and health stations.
Garbage classification
1. Recyclable garbage. Recyclable garbage includes paper, metal, plastic, glass, etc. Through comprehensive processing and recycling, pollution can be reduced and resources saved. For example, every ton of waste paper recycled can produce 850 kilograms of good paper, save 300 kilograms of wood, and reduce pollution by 74% compared with equivalent production; every ton of plastic beverage bottles recycled can obtain 0.7 tons of secondary raw materials.
For every ton of scrap steel recycled, 0.9 tons of good steel can be made, which saves 47% of the cost compared with ore smelting, reduces air pollution by 75%, and reduces water pollution and solid waste by 97%.
2. Kitchen waste, including food waste such as leftovers, bones, roots and leaves, can be composted on-site through biotechnology and can produce 0.3 tons of organic fertilizer per ton.
3. Hazardous waste. Hazardous waste includes waste batteries, waste fluorescent tubes, waste mercury thermometers, expired drugs, etc. These wastes require special safe handling.
4. Other garbage. In addition to the above categories of garbage, other garbage includes bricks, ceramics, slag, toilet paper and other difficult-to-recycle waste. Sanitary landfill can effectively reduce the impact on groundwater, Pollution of surface water, soil and air.