Nitrogen phosphor interception undercurrent dam

Abstract

The invention relates to an undercurrent dam which is applied in a farmland ecological trench to intercept substances such as nitrogen, phosphor and the like. According to the invention, water permeable walls are arranged at the two sides. A gravel filter layer is arranged in the middle of the water permeable walls. A soil cover layer is disposed over the gravel filter layer. A vegetable system is planted on the soil cover layer. The undercurrent dam can be placed in a farmland drainage channel and a surface flow wetland. In the surface flow wetland system, when sewage flows through the undercurrent dam, hydraulic retention time can be effectively increased; in addition, due to the arrangement of the gravel filter layer, suspending pollutants in the water body can be settled and absorbed, and plants on the undercurrent dam can effectively absorb eutrophicated pollutants such as nitrogen, phosphor and the like in the water body. Finally, sewage treatment effect of a common surface flow wetland is increased.

Description

technical field [0001] The invention relates to a nitrogen and phosphorus intercepting undercurrent dam, in particular to a nitrogen and phosphorus intercepting undercurrent dam applied to farmland ecological ditches to intercept nitrogen, phosphorus and other substances. Background technique [0002] The seasonal utilization rate of chemical fertilizers in my country is low (34.2%), especially the utilization rate of nitrogen fertilizer is only 30%-35%, which is 10-20 percentage points lower than that of developed countries. However, the problem of environmental pollution caused by increasing fertilizer input has become increasingly prominent. This agricultural production model based on high chemical fertilizer input has also directly accelerated the consumption of important natural resources. [0003] With the use of high-intensity agrochemicals, the loss of nitrogen, phosphorus and other pollutants in farmland has become an important factor causing water eutrophication. ...

AI Technical Summary

Problems solved by technology

[0004] Due to the high cost of treatment and maintenance, the existing sewage treatment plants are often in the state of intermittent operation or no operation at all, resulting in the waste of a large amount of construction funds and the deterioration of environmental pollution

In addition, the traditional activated sludge method is mainly used to remove carbon source pollutants, while the removal of nutrients such as nitrogen and phosphorus is negligible. After the effluent is discharged into the environmental water body, it is easy to cause problems such as eutrophication.

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