诺敏河流域水环境质量现状及污染源解析

Present State of Water Environment Quality and Analysis of Pollution Sources in Nomin River Basin

诺敏河流域上游为山岳地区,森林覆盖度较高,下游平原地区灌区分布广泛.分析了诺敏河流域水质现状,并对各污染源入河量进行了调查,结果表明诺敏河流域干流和支流主要超标因子为总磷、COD和BOD5,现状流域污染源主要分布在流域干流诺敏镇以下及支流中下游,污染源主要为灌区退水,其次为畜禽养殖,农村生活污染源对河流水质影响很小.

The Nomin River Basin is a mountainous area with 1uxuriant forest areas,lightly populated,good ecological environment,and the lower plains are agricultural and pastoral areas with flat terrain.fertile land and extensive irrigation areas.The present state of water quality in the basin is evaluated and analyzed.and the investigation and statistics on the inflow of pollution sources such as rurallire.1ivestock and poultry breeding and return water of irrigation areas are carried out,the resuhs show that the main exceeding standard factors of the mainstream and tributaries in the basin are total phosphorus,COD and BOD5,and the other factors can basically meet the class I-Ifl water quality standards.The present source of pollution in the basin are mainlv distributed below the mainstream of the river basin and the middle—lower reaches of the tributaries.The main pollution source is return water of irrigation area,followed by the livestock and poultry breeding.The ruralliv—ing pollution sources have little impact on the river water quality.