A composite constructed wetland with alternate operation subsurface flow and its application method

Abstract

The invention relates to an artificial wetland system, which forms an A / O denitrification operation process by connecting two stages of wetlands in series, with upstream aeration and downstream non-aeration, so as to realize the removal of TN and improve the pollutant removal capacity at the same time. The second-level wetland is a compound wetland with upper surface flow and lower subsurface flow, which increases the diversity of plants in the wetland system, improves the pollutant removal capacity and landscape beautification effect. By changing the water inlet direction, the flow direction of the water flow inside the wetland can be adjusted to alleviate the problem of wetland filler blockage, and water distribution and collection pipes with different heights are set up. When the temperature is low in winter, the pipes with lower heights are used to distribute water. It can avoid the freezing of pipelines and ensure the operation in wetlands in winter. The bottom of the wetland is equipped with a mud collection area and a mud collection pipe, and a mud collection pipe is installed on the mud collection pipe. The hose is inserted deep into the mud collection pipe through the mud collection pipe, so that the mud collection at the bottom of the wetland can be removed without dead ends, and the use of the wetland is greatly improved. life.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to an artificial wetland system. Background technique [0002] With the continuous deepening of my country's water ecological environment protection work, more and more advanced treatment of tail water in sewage treatment plants and centralized treatment of rural sewage have been carried out. Among many technologies, artificial wetlands are due to their unique natural ecological principles , Lower operating costs, and more environmentally friendly features have emerged widely. But its shortcomings are also very obvious, such as low treatment load, or it is suitable for treating tail water of sewage plants with large water volume but low pollutant concentration, or for rural sewage with high pollutant concentration but small water volume; subsurface wetlands with fillers are easy to block; The reduction in winter temperature leads to a further reduction in treatment effici...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the ubiquitous problems of low processing load, easy clogging, and difficulty in overwintering in constructed wetlands, the present invention provides an alternative operation anti-clogging superficial flow composite aerated constructed wetland and its application method

Images