Study on the Water Environmental Carrying Capacity of Densha River Basin
Taking a heavily polluted river(Dengsha river)in Dalian City as the research object,the water environ-ment 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(NH3-N)cannot satisfy the requirements of wa-ter 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 Deng-hua estuary control unit can also meet the requirements after centralized sewage treatment.
basinenvironment capacitycontrol unit divisionriver carrying capacity
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