西北地区地表供水质量调查分析

Investigation and analysis of the quality of surface water supply in northwest area

根据2000年地表水供水调查资料,对西北6省(区)的供水工程、供水量、供水水质情况进行了统计分析。结果表明:西北地区地表总供水698.57×108m3,以引水工程供水为主;供水主要用于农业,占区域总供水量的97.5%,生活、工业供水总量相差不大;供水水质总体较好,满足Ⅲ类水质的供水量占72%,总供水合格率为86.6%,超标项目主要为化学需氧量、氨氮,造成水污染的原因是点源和非点源污染物的共同作用。

According to the investigation data of surface water supply in 2000, we calculated and analyzed the status of water supply facilities, water supply quantity and quality in northwest area. The results shown that the total water supply volume is 69. 857 billion m^3, mainly used in agriculture, taken up 97. 5%. There was no difference in water supply volume for living and industry. Water supply quality was good in whole, meeting the water quality Ⅱ taken up 72 %, the whole ehgible water quality rate was 86.6%, beyond standard items, the main were chemical oxygen demand and ammonia nitrogen, the reason of water pollution was point and non-point coaction.