黄河水质宁夏段氨氮变化状态分析

Analysis of Ammonia-Nitrogen Pollution in Ningxia Section of the Yellow River

黄河内蒙古段入境水质氨氮超标,对内蒙古自治区以黄河水为循环冷却水的电厂安全稳定运行产生严重影响。通过对黄河宁夏段2003-2004年氨氮指标的水质监测数据的时间和空间分布进行分析,并对宁夏境内氨氮污染源进行调查发现:氨氮含量超标的河段主要在青铜峡至石嘴山段,并且在枯水期超标更为严重,枯水期氨氮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。丰、平水期氨氮污染主要来自城镇地表径流、农田径流、农村生活污水(分散式禽畜养殖)及生活垃圾等非点污染源。黄河宁夏段的氨氮污染主要来自宁夏境内,对宁夏以及黄河下游省份取用黄河水造成一定的影响。

Ammonia - nitrogen in the water in the Yellow River is lower than the targeted standard in Inner Mongolia. It have serious influences on the safty and stable operation of the circulating cooling water for power plants that water come from the Yellow River in Inner Mongolia Autonomous Region. Based on monitoring water quality in time and space distribution of ammonia - nitrogen pollution in Ningxia section of the Yellow River in2003 - 2004. An investigation was made to the pollution sources of ammonia - nitrogen in the Ningxia Autonomous, Region. It is found that water quality from Qingtongxia 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 in dry period. Ammonia - nitrogen discharge is mostly from Yinehuan City and Shizuishan City. Ammonia - nitrogen is polluted and mainly come from not some pollution sources such as urban rainwash, farmland surface flow, rural sanitary sewage（the dispersing type birds raise the bone） and domestic rubbish in period when a river is at its normal level. Ammonia - nitrogen pollution is mainly come from Ningxia, And take some influences on peoples life of Ningxia and the other provinces down of the Yellow River.