An industrial wastewater pollution degree evaluation method based on improved fuzzy evaluation theories

The evaluation of industrial wastewater pollution levels is the prerequisite for pollution control, and in some case, we need to focus our attentions on some key factors. But the classical fuzzy evaluation method had some limitations to resolve this kind of pollution levels evaluation problem. In the paper, we analyzed the classical fuzzy evaluation method to find the shortcomings of the method firstly, and then improved the fuzzy evaluation method by changing the weighting of the factors in order to highlight the key factors. The result of cases studied shows that the method presented in this paper is more reasonable to the problem.