Bioretention pond suitable for treating runoff sewage in rural area of south jiangsu

The invention discloses a bioretention pond suitable for treating runoff sewage in the rural area of south Jiangsu. The bioretention pond comprises a bioretention pond body and filler. The height of the filler of the bioretention pond ranges from 400 mm to 1600 mm, the sewage retention time ranges from 2 hours to 10 hours, and the height of the submerged area ranges from 0 mm to 600 mm; the filler comprises sandy soil, fine san, coarse sand, gravilla, stones and pebble; the plants planted in the bioretention pond are cattail, acorus calamus and ryegrass; the submerged area of the bioretention pond contains a carbon source. Compared with the prior art, the bioretention pond has the advantages that the bioretention pond is stable in the removing effect of N and P in runoff sewage in the rural area; the removal and conversion efficiency of N-type pollutants is improved according to the change rule of the N-type pollutants in the bioretention pond; pollutants for causing runoff pollution in the rural area, such as TN, TO3-N, NH4-N, TP and TSS can be effectively removed through the bioretention pond, and the bioretention pond is a rural water environment ecological treatment technology which is efficient, low in consumption and simple in operation and has a development prospect.