Taking the polluted municipal river as the research object, nitrogen translation and removal were studied through the simulated experiments. The results showed that temperature was one of the most important factors in the removal of nitrogen if other environmental conditions were similar. The removal rate of nitrogen in summer was much greater than that in winter. However, when the temperature was similar, illumination became the most important factor in nitrogen translation. The results also showed that the nitrite and nitrate nitrogen in water would be cumulate without illumination, but would be not cumulate with illumination. It is concluded that the assimilation of algae in the light played a major role in nitrogen translation. Translation rate caused by the assimilation of algae was significantly higher than the nitrification and denitrification process.
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