Abstract: Adding carbon source is the most effective nitrogen removal method to achieve complete denitrification of constructed wetlands. Traditional carbon source has the disadvantages of high cost and complicated process. In this paper, common wetland plants (Typha orientalis, Canna indica, Nelumbo nucifera, Potamogeton crispus, Miscanthus lutarioriparius, Carex brevicuspis) and agricultural waste (corn cobs and rice straw) were selected as carbon source materials, which conforms to the waste utilization principle of "local materials and in-situ treatment". The release capacity data of 8 different plant carbon source nutrients (organic carbon, total nitrogen) were observed through the plant carbon source release test, and the plant materials with better carbon release capacity and weak nitrogen release capacity were comprehensively screened out for denitrification test observation in constructed wetlands. This dataset collates (1) experimental data sets of different plant carbon sources, including organic carbon concentration and total nitrogen concentration released by 8 plant carbon sources at different times; (2) Denitrification test dataset of constructed wetlands with different plant carbon sources mainly includes the effect of three plant carbon sources on total nitrogen concentration, organic carbon concentration, ammonium nitrogen concentration, nitrate nitrogen concentration, etc. Through the review and evaluation of the data and results of the carbon release capacity of wetland plants and the nitrogen removal effect of constructed wetlands, the research paper formed from this data set has been published in the journal of Lake Science. This data set can provide reference for the study and utilization of wetland plant carbon release dynamics, and provide data support for improving wetland nitrogen removal effect.
Keywords: scientific data; constructed wetland; carbon source; plants; wetland nitrogen removal