Unpowered reoxygenation water inflow system of subsurface flow artificial wetland in northern cold region

Abstract

The invention discloses an unpowered reoxygenation water inflow system of a subsurface flow artificial wetland in a northern cold region. A water inflow pipe, a water inflow flange, a gas-liquid mixing chamber, a water effluent flange and a water outlet pipe are successively installed on the same centre line and are all buried below a soil permafrost; one end of the gas-liquid mixing chamber is connected with the water inflow pipe by the water inflow flange, and the other end of the gas-liquid mixing chamber is connected with the water outlet pipe by the water effluent flange; one end of an air suction pipe extends out of the ground surface and then is communicated with atmosphere, and the other end of the air suction pipe extends into the gas-liquid mixing chamber; only half pipe wall, which is adjacent to the side of the water inflow pipe, of the air suction pipe which extends into the gas-liquid mixing chamber is reserved, and the half pipe wall is called a negative-pressure baffle the circular arc face of which faces to water; and the air suction pipe, the water inflow pipe and the water effluent pipe have the same internal diameter which is 0.5 time that of the gas-liquid mixing chamber. By means of the unpowered reoxygenation water inflow system disclosed by the invention, the wetland water inflow dissolved oxygen content can be increased and the problem that the subsurface flow wetland in the northern cold area can not normally operate in winter can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of environmental engineering sewage treatment, in particular to an unpowered reoxygenation water intake system for subsurface flow constructed wetlands suitable for climate conditions in northern cold regions. Background technique [0002] Constructed wetland sewage treatment technology is a sewage treatment technology developed in the 1970s. Compared with traditional sewage treatment technology, it has strong adaptability to pollution load changes, low energy consumption, low engineering infrastructure and operating costs, and maintenance management. It is convenient, the effluent has certain biological safety, and the sewage can be used as a resource. It has high economic, social and environmental benefits. [0003] Oxygen content in constructed wetlands is generally low, and the interior of wetlands is dominated by anoxic environment, resulting in a decrease in COD removal efficiency. In order to overcom...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a non-powered reoxygenation water intake system for submerged artificial wetlands in cold northern regions. Subsurface wetlands cannot function normally in winter

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