Artificial wetland sewage treatment method

Abstract

The invention discloses an artificial wetland sewage treatment method which comprises the following steps that (1) to-be-treated sewage is introduced into an artificial wetland through a water inlet system arranged over a descending tank, the to-be-treated sewage sequentially passes through a plant layer, a gravel sand layer, a gravel layer, a cobblestone layer, a pyrite slag layer and a gravel layer which are arranged in the descending tank, and then, water is fed into the ascending pool through a water collecting and distributing pipe which is arranged in a gravel layer of the descending pool and used for communicating the descending pool with the ascending pool; (2) the sewage sent out from the descending tank sequentially passes through a gravel layer, a pyrite slag layer, a cobblestone layer, a gravel layer and a gravel sand layer which are arranged in the ascending tank, and then is sent into a clean water tank through a water outlet collecting pipe and a plurality of liquid level discharge pipes which are communicated with the water outlet collecting pipe and have different liquid level discharge heights; and (S3) when the device operates in a low-temperature environment, treated water is discharged by selecting different liquid level discharge pipes. According to the invention, the artificial wetland treatment efficiency is improved, and the method is suitable for operation in various environments.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a constructed wetland sewage treatment method. Background technique [0002] The use of constructed wetlands to treat urban sewage is to mix soil and filler (such as gravel, etc.) to form a packed bed on a depression with a certain aspect ratio and bottom slope, so that the sewage flows in the filling gap of the bed or on the surface of the bed. , and planting aquatic plants (such as reeds, papyrus, etc.) with good performance, high survival rate, strong water resistance, long growth cycle, beautiful appearance and economic value on the surface of the bed to form a unique animal and plant ecosystem. Constructed wetlands rely on the synergy of physics, chemistry and biology to complete the purification process of sewage, which strengthens the decontamination ability of natural wetland ecosystems. From the perspective of natural regulation, constructed wetlands also have a strong ecolo...

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Problems solved by technology

At the same time, in the case of lower temperature and oxygen content, the activity of microorganisms will also decrease, which will reduce the ability of microorganisms to decompose organic matter.

According to research reports, the removal rate of constructed wetlands varies with seasons in the order of summer>autumn>spring>winter, and the indexes of ammonia nitrogen and permanganate vary greatly, and the removal rate drops significantly in winter

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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