Abstract
The author selected three expressways in Guizhou as the research objects, and the runoff pollution characteristics were researched by sampling, measuring and analyzing runoff during the rainfall. According to the research data, the primary pollution factors in expressway runoff such as SS. COD and Petroleum had greater pollution intensity; the BOD5, NH3-N, TP and Pb had medium pollution intensity, which were defined as the secondary pollution factors; the range of BOD5/COD was 0.0351∼0.1025, which means a poor biodegradability for the expressway runoff. The expressway runoff showed different pollution characteristics and discharge rules, which were mainly affected by the rainfall and rainfall intensity. The first flush effect (FFE) was mainly medium and weak in the research area, and the degree of FFE was relatively weak under the light rain conditions, FFE didn’t occur in some rain events. This work is expected to pave the way for the pollution control of expressway runoff.
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