How to deal with the pollution of livestock and poultry breeding in the world

Introduction: since the 1950s, large-scale intensive breeding has been carried out in developed countries, and intensive livestock and poultry farms have been established in urban suburbs As a result of a large number of feces and sewage produced every day, it is difficult to treat and use, resulting in serious environmental pollution In the 1960s, Japan highly summarized the seriousness of this problem with the concept of "animal pollution" At the same time, many developed countries quickly take measures to intervene and restrict, and standardize management through legislation Japan: serious "livestock farm pollution" occurred in the 1970s Since then, seven laws have been formulated, including the law on waste treatment and elimination, the law on prevention of water pollution and the law on prevention of odor, which have made clear provisions on the management of livestock and poultry pollution The United States: the Federal Water Pollution Law focuses on the construction and management of poultry farms For livestock farms of a certain scale, the construction must pass the environmental permit Germany: it is stipulated that livestock manure shall not be discharged into groundwater source or ground without treatment Norway: in order to prevent livestock and poultry sewage from polluting water resources, the water pollution law was issued in 1970 In 1973, 1977 and 1980, the Ministry of environmental protection issued many laws and regulations, stipulating that it is forbidden to dump any livestock manure on frozen and snow covered land; it is forbidden to discharge livestock and poultry sewage into rivers Denmark: in order to reduce fecal pollution, it is required to determine the maximum density index of livestock and poultry according to the amount of feces that can be contained in each hectare of land; the feces applied to the bare land must be ploughed into the soil within 12 hours after application, and the feces shall not be applied on frozen soil or snow covered land; the fecal storage capacity of each farm shall reach the fecal production of 9 months Holland: animal husbandry is highly intensive, and about 1 / 6 of the country's excrement is surplus every year In order to prevent the pollution of livestock and poultry excrement, the legislation of 1971 stipulates that it is illegal to discharge excrement directly into the surface water Britain: it is a country basically free of animal pollution Although its population and industry are relatively concentrated, animal husbandry is far away from big cities and closely integrated with agricultural production After treatment, the manure of livestock and poultry are all used as fertilizer, which not only avoids environmental pollution, but also improves the soil fertility Singapore: the government has stipulated that the sewage discharge from pig farms must be less than 250 mg / L (up to 30000 mg / L before treatment) For this reason, pig farms have to pay a price equivalent to $7.45 per pig sold.