目前,我国是世界上最大的肉、蛋生产国,猪肉、禽肉和鸡蛋产量均居世界第一,畜牧业连续20多年保持年增长10%。同时,由此带来的生物污染问题也愈加严重,据国家环保总局调查,2003年我国畜禽粪便产量约24亿t,是工业固体废弃物的2.4倍。畜禽 At present, China is the largest producer of meat and eggs in the world. The output of pork, poultry and eggs ranks the first in the world. Livestock husbandry has maintained an annual increase of 10% for more than 20 years. At the same time, the biological pollution brought by it is also aggravated. According to the survey conducted by the State Environmental Protection Administration, in 2003, the output of animal manure in China was about 2.4 billion tons, 2.4 times that of industrial solid waste. Livestock