| Summary: | Low-polluted water mainly includes low-polluted river water, tailwater from sewage plants, urban surface runoff, and agricultural runoff, which have the characteristics of a large discharge volume, wide pollution area, low carbon to nitrogen ratio(C/N), and poor biodegradability. Constructed wetlands are an effective means of purifying low-polluted water. Different types of constructed wetlands have different removal effects on low-polluted water. This paper discusses the nitrogen removal effects in low-polluted water by different types of constructed wetlands. The microbial mechanism of nitrogen removal in low-polluted water is summarized, and the different influencing factors(pH, dissolved oxygen, temperature, C/N, plants, and substances) and optimization methods are analyzed. This study is expected to provide a reference for the treatment and reduction in the pollution load of low-polluted water by constructed wetlands and lake basin protection projects.
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