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首页> 外文会议>Environmental Permitting Symposium Vol.1 Feb 17-19, 1999, Research Triangle Park, NC >EPA Region 6 Proposed NPDES CAFO General Permits: Requirements for Nutrient Management and Utilization
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EPA Region 6 Proposed NPDES CAFO General Permits: Requirements for Nutrient Management and Utilization

机译：EPA地区6建议的NPDES CAFO通用许可证：营养管理和利用要求

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摘要

Rapid growth of the animal feeding industry in EPA Region 6 has resulted in increased public concerns associated with improper management and utilization of manure-derived nutrients, such as phosphorus (P) and nitrogen (N). To address these concerns, EPA Region 6 (EPA) has drafted two National Pollutant Discharge Elimination System (NPDES) general permits for concentrated animal feeding operations (CAFO). The two draft permits ― the impaired watershed permit for CAFOs located in nutrient-impaired watersheds and the non-impaired watershed permit for all other CAFOs outside of nutrient-impaired watersheds ― were publicly announced in the Federal Register on June 26, 1998. When finalized, the draft permits will replace the CAFO general permit which expired on March 10, 1998. The proposed impaired watershed general permit is designed to address water quality impacts in nutrient-impaired watersheds by requiring that manure/wastewater be applied at rates based on P requirements of crops. Outside of nutrient-impaired watersheds, the proposed permits require that CAFO operators apply manure/wastewater at rates based on crop requirements of N. However, land application of manure at rates based on N requirements of crops results in a build-up of P in land application fields. Therefore, annual soil sampling would ensure that the concentration of P in land application fields does not exceed threshold levels established by the State/Tribe or the USDA Natural Resources Conservation Service (NRCS). If CAFO operators switched from N-based to P-based manure/wastewater application rates when the P threshold level has been reached in a particular land application area, nutrient runoff into surface water would be abated.
机译：EPA地区6中动物饲养业的快速发展导致公众对不当管理和利用粪便衍生养分（例如磷（P）和氮（N））的关注增加。为了解决这些问题，EPA 6区（EPA）已起草了两个《国家污染物排放消除系统（NPDES）》通用许可证，用于浓缩动物饲养业务（CAFO）。 1998年6月26日，《联邦公报》公开宣布了两项许可证草案，即位于营养受损的流域的CAFO的流域许可证受损，以及营养受损的流域以外的所有其他CAFO的非受损流域许可证。 ，该许可证草案将代替1998年3月10日到期的CAFO通用许可证。拟议的流域减损通用许可证旨在解决养分受损流域的水质影响，要求按P要求的比例施用肥料/废水庄稼。在营养受损的集水区之外，拟议的许可证要求CAFO经营者以基于N作物需求的比率施用肥料/废水。但是，以基于N​​作物需求的比率施用土地的肥料会导致P积累。土地应用领域。因此，每年的土壤采样将确保土地应用领域中的磷浓度不超过州/部落或美国农业部自然资源保护局（NRCS）设定的阈值水平。如果在特定土地应用区域中达到P阈值水平时，CAFO操作员从基于N的肥料/废水的施用比例转换为基于P的肥料/废水的施用比例，则将减少养分径流流入地表水中的情况。

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