黄河宁夏段氨氮污染状态分析

通过对黄河宁夏段氨氮污染状况水质监测数据的时间和空间分布进行分析。对宁夏全区氨氮污染源进行调查发现：水质迭不到功能区水质目标的河段在银川至石嘴山段，主要集中在枯水期，污染主要来自工业和城镇生活的点污染源．氨氮主要的陆域排放源是银川市和石嘴山市。氨氮点污染源排放显著地影响着黄河宁夏段枯水期水质，对丰、平水期水质影响不明显。黄河宁夏段流量大于600m^3／s时。水质在氨氮方面达到规划水质目标，小于600m^3／s时，污染源必须减量排放。排放量应视当时的流量而定。

Analysis of ammonia-nitrogen pollution in Ningxia section of the Yellow River

An investigation was made to the pollution sources of ammonia-nitrogen in the Ningxia Autonomous Region, based on monitoring water quality in time and space distribution of ammonia-nitrogen pollution in Ningxia section of the Yellow River. It is found that water quality from Yinchuan to Shizuishan is lower than the targeted standard, which is mainly happened in dry period. Point pollution from the industry and domestic is the main sources of pollution. Ammonia-nitrogen discharge is mostly from Yingchuan City and Shizuishan City.Point pollution of ammonia-nitrogen greatly affects the water quality in dry period, but not obvious in rich and normal periods. When flow is more than 600 m^3/s, ammonia-nitrogen content can meet the quality standard, but when flow is less than 600 m^3/s, pollution discharge must be reduced according to the flux of that time.