Sewage treatment system of artificial wetland

Abstract

The invention discloses a sewage treatment system of an artificial wetland. The sewage treatment system comprises two sedimentation tanks which are arranged in parallel, wherein reversing valves are arranged in front and back of the two sedimentation tanks respectively; a dreg discharging hole is formed in the bottom of each sedimentation tank; a grating well, an aeration adjusting tank, a hydrolytic acidification tank, a contact oxidization tank and a wetland purification tank, an aeration wetland purification tank and a disinfection tank are arranged at the downstream of the sedimentation tanks through pipelines; the grating well is internally provided with a coarse grating and a fine grating in sequence from a water inlet to a water outlet; a pressure sensor and a negative-pressure suction nozzle are arranged at a water inlet side of the fine grating; the negative-pressure suction nozzle is connected onto a retractable rod; the negative-pressure suction nozzle is clung to the fine grating; the grating well is communicated to the aeration adjusting tank through a water inlet pipe; a filter screen is obliquely arranged in the aeration wetland purification tank; a plurality of grades of composite packing wetland regions are arranged above the filter screen; a free falling water height difference is formed between two adjacent grades of composite packing wetland regions. By optimizing a structure and a material, the purification efficiency of sewage is greatly improved and the sewage treatment system is not easy to block.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an artificial wetland sewage treatment system. Background technique [0002] The constructed wetland system is a water treatment system that consumes less power. It uses artificial methods to build a wetland system, and uses media filtration, plant root adsorption, and the action of microorganisms in the media to treat wastewater, especially for domestic sewage. [0003] A traditional constructed wetland system generally includes a hydrolytic acidification unit and a wetland unit. The hydrolytic acidification unit pretreats the wastewater, and converts macromolecular organic matter into small molecular organic matter through hydrolysis, so that it can be more easily degraded by microorganisms in the medium in the wetland unit. In addition, the hydrolytic acidification unit can convert the organic nitrogen in the wastewater into ammonia nitrogen, which is more conducive to the ab...

AI Technical Summary

Problems solved by technology

[0005] 1. The pre-hydrolytic acidification tank does not contribute much to the treatment effect. Most of the organic matter is removed by the medium interception of the wetland, the adsorption of the roots and the action of microorganisms. The removal rate of the pollutants in the hydrolytic acidification tank itself is not high. The pollutant removal rate of the whole constructed wetland is lower than that of the traditional A / O system (ie aerobic / anaerobic process or anaerobic / aerobic process) and other methods

[0006] 2. The hydrolytic acidification tank often emits acid, smell or produce unpleasant smell

[0007] 3. Because the removal efficiency of pollutants in the hydrolytic acidification tank is not high, the organic matter in the domestic sewage, especially the organic suspended matter (or particulate matter) is likely to cause blockage of the constructed wetland

[0009] 5. The sewage treatment effect of the wetland unit is poor

Images