A Surface Flow-Vertical Underflow Constructed Wetland Treatment Process

Abstract

The invention discloses a surface flow-vertical subsurface flow artificial wetland treatment process, which belongs to the technical field of environmental protection. The construction of the constructed wetland comprises the following steps: 1) select the seedlings of the constructed wetland plant species, first place them in water for cultivation, and then transfer them to different concentrations of NO 3 ‑ / NH 4 + Cultivate in nutrient solution, screen out partial NH 4 + plants and partial NO 3 ‑ Plant; 2) Utilize step 1) to screen partial NH 4 + Plants are planted in surface flow artificial wetlands, partial NO 3 ‑ 3) The surface flow constructed wetland constructed in step 2) and the vertical subsurface constructed wetland are connected in series, the surface flow constructed wetland is set at the water inlet end of the system, and the vertical subsurface flow constructed wetland is set at the system outlet end. The method of the invention performs directional screening on plants according to the dissolved oxygen characteristics and structure of the artificial wetland itself, and the comprehensive treatment efficiency of sewage and the removal efficiency of ammonia nitrogen are relatively remarkable.

Description

Technical field [0001] The present invention belongs to the field of environmental protection technology, more particularly, relates to a surface flow - vertical undercurrent constructed wetland treatment process. Background [0002] The artificial wetland sewage treatment system developed in the past ten years is an ecological engineering technology that simulates the physical, chemical and biological effects in the natural wetland ecosystem and is artificially built for sewage treatment, and has important ecological service functions. Constructed wetlands can use the physical, chemical and biological coordination of matrix-microbial-plant composite ecosystems to achieve efficient purification of wastewater through filtration, adsorption, precipitation, ion exchange, plant absorption and microbial decomposition, and at the same time promote the growth of green plants and increase their yield through the biogeochemical cycle of nutrients and waters. [0003] At present, there are...

AI Technical Summary

Problems solved by technology

The composite constructed wetland system of this application adds ventilation pipes and aeration heads at the bottom of the surface flow constructed wetland mechanism to improve the effect of dissolved oxygen and promote the nitrification reaction of nitrifying bacteria in the wetland system. However, the surface flow constructed wetland water flows on the surface It flows horizontally, and it is difficult to completely improve the dissolved oxygen effect of surface flow constructed wetlands only by adding ventilation and aeration devices, and adding aeration devices will increase additional treatment costs

Images