浙江省畜禽养殖业废水污染特征及环境风险评估研究

根据国家畜禽养殖业水污染物排放标准意见征求工作，对浙江省8家不同规模的养猪场开展了监测分析。研究发现，废水中COD、TN、NH4－N和BOD5等主要污染因子平均浓度超出征求意见稿中直接排放限值；重金属元素Zn和As最大的超标倍数分别为3.87和0.7倍；废水的综合污染指数为7.23，为重度污染级。进一步验证了畜禽养殖业废水属高污染、高环境风险废水，要达到国家畜禽养殖业水污染物排放标准，需整体提升当前的畜禽养殖废水处理深度。

Wastewater Pollution Characteristics of Livestock and Poultry Breeding in Zhejiang Province and Its Environmental Risk Assessment

According to the National Discharge ConsultationStandard of water pollutants for livestock and poultry breeding , this paper selected eight typical pig farm in Zhejiang as the monitoring subjects .The results showed that key pollutants of wastewater livestock and poultry breeding were chemical oxygen(COD), total nitrogen(TN), ammonia nitrogen(NH4 -N) and biochemical oxygen demand(COD), which exceeded discharge standards.The max concentration of arsenic (As) and zinc (Zn) was exceeded discharge standards of 3.87 and 0.7 times, respectively.The comprehensive pollution index of wastewater was 7.23 meaning that it was seriously polluted.The study further validated that wastewater of livestock and poultry breeding in Zhejiang province belongs to high pollution and high-risk wastewater and could never be discharged directly and irrigated crops, which need to be further depth treatment.