Double-layer ditch treatment system for reducing farmland drainage pollutants

Abstract

The invention belongs to the technical field of agricultural non-point source pollution control and discloses a double-layer ditch treatment system for reducing farmland drainage pollutants. The system comprises an upper section and a lower section arranged at the bottom of the upper section, the lower section comprises a trap, a filter wall, a blind ditch and a sedimentation tank, a water inlet pipe and a ball valve installed on the water inlet pipe are arranged at the top end of the front tank wall of the trap, a drainage pipe is arranged at the top end of the rear tank wall of the sedimentation tank, and the upper section is an original ditch. At ordinary times, water drained from the ditch sequentially passes the trap, the filter wall, the blind ditch and the sedimentation tank from the lower section of the treatment system to be purified, accumulated wastewater can be reused for agricultural irrigation, flood of the ditch can directly pass from the upper section of the system when it rains heavily, and the drainage function of the ditch is unaffected.

Description

technical field [0001] The invention relates to a double-layer ditch treatment system, in particular to a double-layer ditch treatment system for reducing farmland drainage pollutants, and belongs to the technical field of agricultural non-point source pollution control. Background technique [0002] In recent years, with the enhancement of human activities, the problems of water pollution and eutrophication have become increasingly prominent. As the main source of water pollution, agricultural non-point source pollution has become an important focus of water environmental pollution control, especially lake pollution control. Farmland drainage ditch system, as the transition zone between farmland non-point source discharge and downstream receiving water body, has dual functions of drainage and pollutant reduction, and has gradually become one of the hotspots of water environmental protection workers at all levels. [0003] At present, an important direction of research on t...

AI Technical Summary

Problems solved by technology

① Most of the water bodies in ecological ditches flow quickly, resulting in short hydraulic retention time and low pollutant removal efficiency

If too many or too high interception dams are set in the ditch, it will affect the drainage function of the ditch; ②The plants in the ecological ditch need to be harvested regularly. If they are not harvested in time, on the one hand, the growing plants will easily block the ditch and affect the drainage of the ditch; On the one hand, when plants rot and decompose, the carbon, nitrogen, phosphorus and other elements in the body will be released again, causing secondary pollution

The harvesting of plants virtually increases the cost of operation and management, and a large amount of harvested biomass is also a kind of solid waste. If it cannot be disposed of in time, it can also cause serious environmental problems; ③ research shows that farmland wastewater with nitrate nitrogen exceeding the standard is the most serious , the effective reduction of nitrate nitrogen is the key to the realization of farmland wastewater treatment

At present, the removal of nitrate nitrogen mainly depends on the denitrification of microorganisms. However, the ditch drainage has strong fluidity and its dissolved oxygen (DO) is relatively high, which is not conducive to the denitrification of microorganisms, resulting in a generally low nitrogen removal effect; ④ Now Some ecological ditches mainly focus on the removal efficiency of pollutants in agricultural wastewater, and less consideration is given to the accumulation and recycling of wastewater. As everyone knows, agricultural wastewater is also an important water resource. If it can be collected, treated and recycled reasonably, it will greatly reduce irrigation water. demand and agricultural wastewater generation

Images