Quantitative calculation model of dilution ratio based on reaching standard of water function zone

Abstract

Dilution ratio is an important indicator of water quality assessment, and it's difficult to calculate quantitatively. This paper proposed quantitative calculation model of dilution ratio based on the permissible pollution bearing capacity model of water function zone. The model contains three parameters of concentration. Particularly, the 1-D model has three river characteristics parameters in addition. Applications of the model are based on the national standard of wastewater discharge concentration and reaching standard concentration. The results show the inverse correlation between the dilution ratio and the C P and C 0, and the positive correlation with C s. The quantitative maximum control standard of dilution ratio is 12.50% by 0-D model and 22.96% by 1-D model. Moreover, we propose to choose the minimum parameter and find the invalid pollution bearing capacity.