Dairy cow deposits on farm roadways are a potential source of contaminants entering streams. Phosphorus (P), suspended sediment (SS) and Escherichia coli (E. coli) loads in 18 runoff events over 12 mo from two-halves of a section of dairy farm roadway that spilt into an adjacent P-impacted stream were measured. The runoff from one half was untreated while the other half was directed through a filter of steel melter slag [termed aluminium chlorohydrate (ACH)-altered slag] sprayed with 1% ACH solution to improve P sorption capacity. An uncertainty analysis was conducted to ascertain potential loads of P lost from roadways considering variation in deposit weight, number and P content. Over the monitoring period, the total load decreased P (92%), SS (98%) and E. coli (76%) from the ACH-altered slag roadway compared to the control. However, uncertainty analysis showed that the amount of dung-P deposited on the roadway could be 10-fold greater.

中文翻译：

---

减少奶牛场道路径流中磷、沉积物和大肠杆菌的损失

农场道路上的奶牛沉积物是污染物进入溪流的潜在来源。磷 (P)、悬浮沉积物 (SS) 和大肠杆菌 (E.coli) 在 12 个月内发生的 18 次径流事件中，从溢出到邻近 P 影响的溪流中的奶牛场道路的两半进行了测量。来自一半的径流未经处理，而另一半则直接通过钢熔炉渣过滤器 [称为水合氯化铝 (ACH) 改性渣]，喷有 1% 的 ACH 溶液以提高 P 吸附能力。考虑到沉积物重量、数量和 P 含量的变化，进行了不确定性分析以确定从道路中损失的 P 的潜在负载。在监测期间，与对照相比，ACH 改变炉渣巷道的总负荷降低了 P (92%)、SS (98%) 和大肠杆菌 (76%)。然而，