An ecological restoration project was conducted in the upstream portion of the Dagu River to improve the urban river water quality as well as to achieve pollution control and remediation of a sewage drainage river. Plant species for phytoremediation were screened and different species were used in the field project. The growth occurred in the following order: macrophytes > slope plants > submerged plants; among different microphytes, Sagittaria sagittifolia > Phragmites australis > Scirpus tabernaemontani > Typha angustata > Iris pseudacorus; among floating plants, Water lily > Lotus. The pollution status of the water body in the phytoremediation area was monitored and compared with that of a clean water area in Mati Lake at Nankai University and the Outer Ring River of Tianjin. In addition, the effects of remediation on the water quality and ecological toxicity of the drainage water were analyzed and assessed comprehensively to show the effects of the ecological remediation project. The results showed that the water quality was improved by the cultivation of aquatic plants
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