Method for processing sewage in non-clogging highly effective vertical subsurface flow wetland

Abstract

The invention relates to a non-clogging and high-efficiency sewage treatment method with vertical downflow wetlands, which is characterized in that the sewage treatment system comprises wetland plants, a plurality of water distributing main pipes, a plurality of water distributing branch pipes, fine grain size substrates, middle grain size substrates and a plurality of catch-water pipes; the system is operated by means of continuous water feeding, time interval or variable level; wherein the water distributing main pipes and the branch pipes are positioned under the bottom surfaces of the fine grain size substrates; the branch pipes are evenly distributed in part of the wetland plants; the middle grain size substrates with the grain size between 5 mm and 10 mm are arranged under the branch pipes; the catch-water pipes are positioned at the bottom of the middle grain size substrates; the fine grain size substrates are arranged in a long strip shape along the direction of the water distributing branch pipes; the wetland plants are planted on the surfaces of the fine grain size substrates; the sewage seeps downwards along plant roots to form the infiltration flow; the middle grain size substrates are filled among the long strips of the fine grain size substrates and are flush with the surface; the surfaces of the middle grain size substrates are exposed to form a atmospheric reoxygenation corridor; the sewage is sufficiently contacted with the air going in and out through the atmospheric reoxygenation corridor, and is discharged via a water collecting system after the interaction with microorganism, substrates and plant roots. The invention has the advantages of no wetland clogging phenomenon under the condition of high-load water feeding, high-efficiency sewage purification, convenient construction, low cost and simple operation and management.

Description

technical field [0001] The invention relates to ecological engineering technology for sewage treatment, belongs to the technical field of environmental protection, and in particular relates to a non-clogging, high-efficiency vertical underflow artificial wetland sewage treatment method. Background technique [0002] Constructed wetland sewage treatment technology is a new ecological engineering technology for sewage treatment that emerged in the 1970s. Due to its advantages of low investment, low energy consumption, convenient management, and no secondary pollution, it is gradually being used in small and medium-sized towns and villages Domestic sewage treatment in the area. As a type of constructed wetland, Vertical Subsurface Downflow Wetlands (VSDW) is characterized by the fact that the water distribution system is laid flat in the upper matrix of the wetland, and the sewage is uniformly distributed in the horizontal section of the wetland, and the sewage is evenly distri...

AI Technical Summary

Problems solved by technology

Therefore, the VSDW process currently has problems such as good treatment effect but easy clogging, no clogging but poor treatment effect, etc. The root cause lies in failure to select a good particle size and type of matrix and failure to arrange water distribution pipes reasonably

Images