Around the city where we live, garbage can be seen everywhere. There is a very clear definition of garbage in science: garbage is solid and semi-solid waste materials that pollute the environment in production, construction, daily life and other activities. At present, in China, garbage pollution has become very serious, and two-thirds of cities are surrounded by garbage. Most of these municipal wastes are left untreated and piled up in the suburbs, which not only occupies a lot of land, but also causes serious secondary pollution. Rubbish plaguing cities is not only a difficult problem faced by China, but also by many countries in the world.
So people always try to deal with garbage, and garbage power generation is the most important way. Garbage power generation refers to a new type of power generation method that uses special garbage incineration equipment, uses urban industrial and domestic garbage as combustion medium, and then generates electricity with the energy emitted by it.
Garbage power generation equipment can first screen, crush and dry garbage, and finally compress it into granules for combustion. This solid fuel from garbage has a heat of 16.8 kilojoules to 21 kilojoules per kilogram, which is similar to coal. It can be seen that garbage can also be changed from waste to a new energy source. But not all garbage can be turned into treasure, like some special garbage, it can not be reused, otherwise it will continue to cause serious harm to the ecological environment and human health.
Some garbage is special. The special garbage we see every day mainly includes radioactive garbage, toxic garbage, infectious garbage, explosive garbage, garbage that can cause fire, garbage with strong corrosiveness and so on. One of the characteristics of these wastes is that they are all composed of hazardous wastes. Although these wastes only account for about 9.3% of the total garbage in the world, their harmfulness is incomparable with other wastes.
For example, ionizing radiation produced by radioactive waste can cause nervous system and digestive system diseases such as headache, dizziness, loss of appetite and sleep disorder. Infectious garbage carries bacteria, viruses, parasites, pathogens, etc., which can be transmitted and caused by human or biological contact; Explosive garbage, pyrophoric garbage and corrosive garbage are also very destructive, some of them can cause disability, and some can explode to cause a serious fire, which is very harmful to the environment and human beings.
In p>1995, "foreign garbage" was discovered in Haikou, Jiangxi, Ningbo, Fujian and Nanjing. In 1996, Tianjin, Zhenjiang, Qingdao, Shanghai and other customs successively seized a large number of "foreign garbage". "Foreign garbage" is a toxic and harmful garbage pollutant that some developed countries transfer to poor countries in order to avoid domestic pollution and avoid high treatment costs. "Foreign garbage" is mostly dirty and smelly, containing a variety of toxic and harmful substances, even with a variety of viruses and molds. Therefore, we must resolutely resist foreign garbage and resolutely reject "foreign garbage" outside the country.