Assessment for Environmental Health of Small-Scale Water Supply Source Based on Triangular Fuzzy Technology

Employing the triangular fuzzy technology, the article establishes a health risk assessment model for small scale water supply source. By using this model not only the value of probable risk indexes of specific substance influencing people´s health but also their corresponding membership degrees (or relative confidence levels) can be obtained. The model is applied to assess the environmental health risk of the small-scale water supply source in South-west of China. The result shows : the cancerous risk indexes caused by As and the total risk reach 2.01~4.05 × 10^-4a-1 and 2.19~4.14 × 10^-4a-1 respectively, exceeding the acceptable levels recommended by ICRP(5.0×10^-5a-1); the non-cancerous risk indexes caused by all pollutions are 1.58~3.36×10^-8a-1, less than the acceptable levels recommended by ICRP. The research shows that it is feasible to assess water health risk by the triangular fuzzy technology.