The emergence of cleaner production is a historical necessity of the rapid development of human industrial production, a new thing in rapid development, and a response and action made by human beings to gradually realize the negative effect of pollution caused by industrial production that is harmful to natural ecology.

in the 1961s and early 1971s, due to the rapid economic development in developed countries, the prevention and control of industrial pollution was neglected, resulting in increasingly serious environmental pollution problems. Public nuisance incidents, such as the Minamata disease in Japan, have caused great harm to human health, seriously damaged the ecological environment, and the social response is very strong. Environmental problems have gradually attracted great attention from governments all over the world, and corresponding environmental protection measures and countermeasures have been taken. For example, increasing investment in environmental protection, building pollution control and treatment facilities, formulating pollutant discharge standards, and implementing environmental legislation have achieved certain results in controlling and improving environmental pollution.

However, through more than ten years' practice, it is found that this method, which only focuses on controlling the sewage outlet (terminal) and making the discharged pollutants reach the standard through treatment, has played a certain role in a certain period or in some areas, but it has not fundamentally solved the industrial pollution problem. The reasons are as follows:

First, with the development of production and the increasing variety of products, as well as the improvement of people's environmental awareness, there are more and more kinds of pollutants discharged from industrial production, and the discharge standards of pollutants (especially toxic and harmful pollutants) under control are becoming stricter and stricter, so the requirements for pollution control and control are getting higher and higher. In order to meet the discharge requirements, enterprises have to spend a lot of money and greatly increase the treatment costs.

second, because of the limited pollution control technology, it is difficult to completely eliminate pollution in essence. Because the general way to control pollution at the end is to pass the necessary pretreatment first, and then discharge it after biochemical treatment. However, some pollutants are non-biodegradable pollutants, which are only diluted and discharged, which not only pollutes the environment, but even causes secondary pollution if some pollutants are not properly treated; Some treatments only transfer pollutants, waste gas into waste water, waste water into waste residue, and waste residue is piled up and buried, which pollutes soil and groundwater, forms a vicious circle and destroys the ecological environment.

Third, only focusing on the terminal treatment method not only requires investment, but also causes some recyclable resources (including unreacted raw materials) to be lost without effective recycling, resulting in higher consumption of raw materials, higher product costs and lower economic benefits, thus affecting the enthusiasm and initiative of enterprises to control pollution.

fourthly, practice has proved that prevention is better than cure. According to the report of Japan Environment Agency in 1991, economically speaking, it is more economical to take preventive measures before pollution than to take measures after pollution. For example, as far as the air pollution caused by sulfur oxides in Japan is concerned, the amount of damage caused by not taking countermeasures after discharge is 11 times the cost of preventing this harm. In the case of Minamata disease, the calculated result is 111 times. It can be seen that the difference between the two is extremely wide.

according to the statistics of American EPA, the total expenditure (including investment and operation expenses) on pollution control of environmental media such as air, water and soil in the United States was $26 billion (accounting for 1% of GNP) in 1972, which soared to $85 billion in 1987 and reached $121 billion (accounting for 2.8% of GNP) at the end of 1981s. For example, DuPont's treatment cost per pound of waste is increasing at a rate of 21-31% per year, and it may cost 311-1511 dollars to burn a barrel of hazardous waste. Even at such a high economic cost, the expected pollution control goal has not been achieved, and the terminal treatment has been overwhelmed economically.

Therefore, through the practice of pollution control, developed countries have gradually realized that the prevention and control of industrial pollution can't rely solely on the pollution of sewage outlets (terminals). To fundamentally solve the industrial pollution problem, we must "put prevention first", eliminate pollutants in the production process and implement the whole process control of industrial production. Since the late 1971s, many developed countries' governments and major enterprise groups (companies) have studied, developed and adopted clean technologies to open up new ways of pollution prevention, and regarded the implementation of clean production as a strategic measure for the coordinated development of economy and environment.

1. Waste water: various indicators of industrial waste water, domestic sewage and drinking water;

2. Waste gas: organic waste gas, soldering waste gas, boiler waste gas, generator exhaust gas, kitchen fume, kitchen fire smoke, all kinds of furnace and cellar exhaust gas and all kinds of process dust;

3. Noise: noise from generator room and air compressor room, noise at factory boundary, etc.