Subsurface flow wetland system suitable for purifying sewage with low carbon nitrogen ratio

Abstract

The invention discloses a subsurface flow wetland system suitable for purifying sewage with a low carbon nitrogen ratio, which is characterized by comprising three modules, namely an efficient sedimentation tank, a deep bed vertical subsurface flow wetland and an enhanced horizontal subsurface flow wetland connected in sequence. The efficient sedimentation tank is a sedimentation pretreatment tank and is internally provided with a flow guide wall for reducing the water inlet flow velocity; a carbon source supplementing channel is arranged at the front end of the deep bed vertical subsurface flow wetland, a slow-release carbon source module is arranged in the carbon source supplementing channel, the deep bed vertical subsurface flow wetland comprises a pipeline water collecting and distributing system and a main body purification area, the main body purification area is provided with a first packed bed layer, and sewage in the carbon source supplementing channel enters the main body purification area through an upper-layer water distributing pipeline; the sewage is then collected to a rear-end water collecting channel through a bottom-layer water collecting pipeline; effluent of the deep bed vertical subsurface flow wetland enters a water distribution channel through a three-stage drop weir plate, then enters the reinforced horizontal subsurface flow wetland through a perforated lattice wall, passes through the perforated lattice wall, is collected to a water collection channel and is discharged through a water outlet pipe; and a second filler bed layer is arranged in the reinforced horizontal subsurface flow wetland.

Description

technical field [0001] The invention relates to an underflow wetland system suitable for purifying sewage with a low carbon-to-nitrogen ratio, which can be used for deep purification processes such as river water quality purification with a low carbon-to-nitrogen ratio and tail water upgrading of sewage treatment plants (stations), and belongs to the technical field of water quality purification. Background technique [0002] Constructed wetland technology uses soil, artificial media, plants and microorganisms to purify sewage through physical, chemical and biological synergy. Because of its advantages of low investment, low operating cost, simple and easy operation, good landscape effect and good economic benefits, It is widely used in municipal sewage standard raising and river water purification projects. [0003] At present, for sewage with low carbon-to-nitrogen ratio, due to the insufficient supply of organic carbon sources, the traditional wetland purification process...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is the low removal rate of total nitrogen pollutants, complex replacement of slow-release carbon sources, and excessive rise in the concentration of organic matter in effluent when the existing process treats sewage with a low carbon-to-nitrogen ratio.

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