1, trace element pollution The absorption rate of trace elements in the digestive tract is low. For example, the absorption capacity of zinc in adult pigs is 7% - 15%, the absorption rate of copper is only 5% - 10%, and the parts that are not digested and absorbed are discharged with feces. It is generally believed that when the available copper and zinc in the soil reach 100-200mg/kg and 100mg/kg respectively, it can cause copper and zinc pollution and plant poisoning in the soil; when the amount of sodium arsenate in the soil is 40mg When the rice is reduced by 50% at /kg, the rice cannot grow when it is 160 mg/kg. In addition, the plant body can also enrich the trace elements in the soil, and through the circulation of the food chain and the ecosystem, the trace elements accumulate in the environment continuously, resulting in more extensive pollution. 2, antibiotic contamination Antibiotic additives play a certain role in ensuring the healthy growth of animals. However, they also cause excessive residues in animal products and the environment, causing serious harm to human health and the environment of the breeding industry. According to statistics, the transurethral output of ç—¢ ç—¢ å occupies 6% to 10% of the original shape, and a 10,000-headed pig farm needs to add 3000-5000 kg of chlortetracycline and other drugs per year, and the amount discharged into the environment is 10%. The farm excretes 300-500 kg of the above-mentioned prototype drug to the environment every year. Due to bacterial resistance, a large number of bacteria are discharged from the farm to the surrounding environment, and once these pathogenic bacteria re-infect the human body, causing an explosive epidemic, its treatment will be very difficult. In recent years, the swine schizophrenia, foot-and-mouth disease, blue-ear disease epidemic and drug residues caused by the pig industry are closely related to the use of antibiotics and the intensive farming environment. 3, phosphorus pollution Phosphorus is the main substance that affects water quality and causes pollution of water and soil. The utilization rate of phytate phosphorus in plant feed is very low. In order to meet the pig's requirement for phosphorus, a large amount of inorganic phosphorus is added to the feed, and the inorganic phosphorus supplied in the production cannot be fully utilized by the pig. The phosphorus is discharged into the environment with manure, causing phosphorus pollution of the soil and groundwater. Phosphorus is discharged into rivers, causing eutrophication of water bodies, reducing water transparency, reducing photosynthesis of plants, over-proliferation of microorganisms, reduction of oxygen, accelerated growth of anaerobic bacteria, odor, and death of fish with oxygen deficiency. Stainless Steel Precision Turned Parts Precision turning parts Stainless Steel Precision Turned Parts,Cnc Turned Components,Turned Components,Cnc Precision Turning Parts Stand Dragon Industrial Co., Ltd. , https://www.standdragontw.com
Precise accessory is a kind of high-precision hardware turning part processed by lathe and other machine tools, which is characterized by high precision, precision and small size
It is a very common product in our hardware processing parts industry and is widely used. The basic precision can reach 0.01mm-0.1mm. The products include steel, aluminum alloy, brass, environment-friendly iron, stainless steel and other precision CNC machining lathe parts of different sizes and shapes
Advantages of precision turning parts:
High technical requirements, beautiful appearance and good product quality
Scope of application:
Mechanical equipment, computers, mobile phones, electrical appliances, fans, cameras, high-end electronics, toys, instruments, automobiles, new energy, optical fiber communications, photographic stage equipment and other products.