登沙河流域水环境承载力研究

Study on the Water Environmental Carrying Capacity of Densha River Basin

以大连市水环境受污染较重的登沙河为研究对象进行水环境承载力研究并提出治理对策。结果表明:综合监测断面、污染源分布、支流汇入口及工业点源分布等水环境条件将登沙河流域划分为5个控制单元,除登沙河登化控制单元外,登沙河其余控制单元COD、氨氮(NH_(3)-N)剩余环境容量均不能满足水环境容量控制要求。登沙河全域COD剩余环境容量为-222.7 t/a,氨氮剩余环境容量为-22.99 t/a。经采用针对性的解决方案后,登沙河唐房控制单元COD和氨氮的剩余环境容量分别为22.3 t/a和-0.86 t/a,登沙河三家子和杨家店控制单元COD和氨氮的剩余环境容量分别为11.6 t/a和0.34 t/a,登化入海控制单元经污水集中处理后COD和氨氮剩余环境容量也可满足要求。

Taking a heavily polluted river(Dengsha river)in Dalian City as the research object,the water environment carrying capacity was studied and the countermeasures were put forward.The results show that the Dengsha river basin was divided into five control units by integrating the water environment conditions such as monitoring cross sections,pollution sources distribution,tributary confluence and distribution of industrial point sources,etc.Except for Denghua control unit of Dengsha river,the remaining environmental capacity of Dengsha river basin in terms of chemical oxygen demand(COD),ammonia and nitrogen(NH_(3)-N)cannot satisfy the requirements of water environment capacity control.The remaining environmental capacity of COD in the whole area of Dengsha river is-222.7 t/a,and the remaining environmental capacity of ammonia nitrogen is-22.99 t/a.After adopting the targeted solutions,the remaining environmental capacity of COD and ammonia nitrogen in Tangfang control unit of Dengsha river is 22.3 t/a and-0.86 t/a,and that in Sanjiazi and Yangjiadian control units of Dengsha river is 11.6 t/a and 0.6 t/a,respectively.The remaining environmental capacity of COD and ammonia nitrogen of Denghua estuary control unit can also meet the requirements after centralized sewage treatment.