An artificial wetland for sewage treatment

Abstract

The invention discloses a constructed wetland for sewage treatment. The constructed wetland comprises a pool wall, wherein the pool wall is of a waterproof structure; a partition wall is arranged in the pool wall and divides the pool wall into a water inlet downward pool at the front end and a water outlet downward pool at the rear end; a filler substrate sequentially comprises a sand layer, a gravel layer, a pebble layer, a macadam layer and a gravel sand layer from bottom to top and is arranged inside each of the water inlet downward pool and the water outlet downward pool; an emergent aquatic plant is planted at the uppermost part of the filler substrate of each of the water inlet downward pool and the water outlet downward pool; a water collecting and distributing pipe penetrating through the water inlet downward pool and the water outlet downward pool is mounted at the gravel layer at the bottom of the pool wall; two ventilation pipes of which the upper ends extend out of a substrate filler on the uppermost layer are mounted on the water collecting and distributing pipe; an inlet water distributing pipe connected with a water inlet pipe is mounted above the water inlet downward pool, and an outlet water distributing pipe connected with a water outlet pipe is mounted at the upper part of the water outlet downward pool. The constructed wetland disclosed by the invention improves the sewage treatment efficiency, is not affected by climatic temperature conditions, stably runs throughout the year and ensures that outlet water reaches the standard.

Description

Technical field [0001] The invention relates to a sewage treatment method, in particular to an artificial wetland used for sewage treatment, and belongs to the technical field of sewage treatment. Background technique [0002] The use of constructed wetlands to treat urban sewage is an ecological treatment method that only emerged in the 1970s and 1980s. It is artificially used to treat sewage and mix soil and fillers to form a filler bed on a depression with a certain aspect ratio and bottom slope. Sewage flows in the filling gaps of the bed or on the surface of the bed, and planted on the surface of the bed has good performance, high survival rate, strong water resistance, long growth cycle, beautiful and economically valuable aquatic plants (such as reeds, Cattail, etc.) form a unique animal and plant ecosystem. At present, constructed wetlands rely on the synergy of physics, chemistry, and biology to complete the purification process of sewage and strengthen the decontaminat...

AI Technical Summary

Problems solved by technology

Under low temperature conditions in winter, it not only affects the removal effect of the constructed wetland, but also has problems such as low nitrogen removal efficiency, substrate clogging, and bed anoxic in the constructed wetland treatment process.

In addition, low temperatures can cause certain other problems including freezing of the wetland media / substrate, lack of oxygen in the wetland bed, and pipe bursts

Constructed wetlands are greatly affected by climate and temperature conditions, which is one of the reasons that limit the promotion and application of constructed wetlands in cold regions

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