Anaerobic/aerobic constructed wetland combined system and method for enhanced treatment of sewage with low C/N ratio

Abstract

The invention relates to an anaerobic / aerobic constructed wetland combined system and method for enhanced treatment of sewage with a low C / N ratio. The combined system comprises a sedimentation tank, a horizontal subsurface flow constructed wetland, a vertical subsurface flow constructed wetland and a reflux tank which are arranged in sequence, wherein the sedimentation tank is provided with a water outlet pump, and the reflux tank is provided with a reflux pump. According to the invention, effluent of the sedimentation tank is pumped into the horizontal subsurface flow constructed wetland by the water outlet pump through the water outlet pipe, is uniformly distributed in the water distribution area and then is guided to the flow guide plate to enter the matrix layer, sewage in the water storage area is conveyed to the water distribution pipe through the water outlet pipe, is uniformly distributed, and then enters the vertical subsurface flow constructed wetland, and after entering the vertical subsurface flow constructed wetland, the sewage flows into the reflux tank through the matrix layer in the water storage area by utilizing the water level control valve, and is pumped into the horizontal subsurface flow constructed wetland by the reflux pump so as to perform denitrification. The equipment has the advantages of simple structure, high efficiency, low cost, easiness in operation, capability of synchronously removing carbon, nitrogen and phosphorus and the like, and the treatment performance of the system is improved by recycling effluent.

Description

technical field [0001] The invention relates to an anaerobic / aerobic constructed wetland combination system (HSSF-VSSF) system and method for synchronous decarbonization, nitrogen and phosphorus removal of sewage with a low carbon-to-nitrogen ratio. It belongs to the field of water pollution control. Background technique [0002] Although the traditional biological nitrogen and phosphorus removal methods play a certain role in the sewage treatment process, there are still many bottlenecks. For example: the complete transformation of ammonia nitrogen into nitrate nitrogen requires a large amount of dissolved oxygen in water, which increases the cost of aeration; the treatment of low C / N ratio sewage or high carbon nitrogen and phosphorus sewage needs to rely on external organic carbon sources to improve pollutant removal efficiency; good The oxygen biological phosphorus removal process increases power consumption and produces a large amount of excess sludge; the entire treat...

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Problems solved by technology

[0004] After the above-mentioned strengthening measures are implemented, the constructed wetland system still has unsatisfactory denitrification effect on wastewater, and the implementation of such strengthening measures will also increase the construction and operation costs of the wetland system and increase the area occupied

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