畜禽养殖行业废水排放标准的研究

Study of Discharge Standards on Excrement of Livestock and Poultry Farms

讨论了畜禽养殖行业的排放污水、粪渣及恶臭的污染状况;综合国内外对畜禽场排放污水所采用的治理技术、达到的各项指标及中国目前的经济状况、技术条件,提出畜禽养殖行业排放污水的生化指标上限值,COD_(Cr)、BOD_5、SS、KN、TP分别为200、80、150、20、2.0mg/L,pH为6.5～9.0;卫生指数的粪大肠菌群数少于10~4个/L,蛔虫卵标准值为少于2个/L,粪渣经无害化处理后,蛔虫卵死亡率>95％;恶臭标准按感官作用阀值,采用国家2级标准。

Discussion of sewage, excrement and malodor from livestock and poultry farms were presented, and also summarized the treatment techniques, discharge standards at home and abroad, and technical economic conditions in China. Finally, the maximal discharge standards were recommended as: CODcr 200 mg/1, BOD5 80mg/l, SS 150mg/l, KN 20mg/l, TP 2.0mg/l, pH 6.5-9.0, coliform count < 104/1, mortality of roundworm ova more than 95%, and the threshold odor adopting to grade Ⅱ of National Standard.