Research on the Capacity of the Environment Water Receiving the Contamination Distinguishing Value and Its Application

To the question of oacking relational water quality index about the actual demand for river eco-management,the paper presents the pollutant-capacity ratio,which refers to the ratio value between the actual quantity of holding pollutant and the permitted quantity of accepting pollutant under the environ protection objective when the environ water body accepts sewage waters.The comprehensive evaluation model for water quantity and quality by river eco-water requirement is perfected on the basis of the pollutant-capacity ratio.Taking the Dongliao River for example,the pollutant-capacity ratio is tested in the paper.The results indicate that the pollutant-capacity ratio can not only be used as the index for the evaluation of eco-water quality,and the accuracy of evaluation results improved,but also be adopted to quantity the surplus and deficit degrees to reflected to the river environ holding capacity.Also the pollutant-capacity ratio can be used as the distinguishing value for environ water body accepting containment capacity so as to be convenient for the river eco-management.