Small-sized compound flow type underflow constructed wetland

Abstract

The invention discloses small-sized compound flow type underflow constructed wetland, which comprises a constructed wetland system pool, wherein an impervious layer is arranged in the constructed wetland system pool in a covering way; the upper end of the impervious layer is provided with a silt guide layer; a filling layer is arranged at the upper end of the silt guide layer; a planting layer is arranged at the upper end of the filling layer; aquatic plants are arranged in the planting layer; a water distribution layer is arranged on the planting layer; the roots of the aquatic plants penetrate through the water distribution layer to be arranged in the planting layer; a water distribution pipe is arranged at one side of the outer wall of the constructed wetland system pool; a water collecting ditch is arranged at the other side of the outer wall of the constructed wetland system pool; a water dispersion pipe is arranged in the filling layer; a water outlet pipe is arranged at one side, near the water collecting ditch, of the filling layer; the water outlet pipe is arranged in the water collecting ditch; a water collecting pipe is arranged in the silt guide layer; the water distribution pipe and the water collecting pipe are connected through the water dispersion pipe; a water outlet of the water collecting pipe is formed in the water collecting ditch. By adopting the mode, the small-sized hybrid flow type underflow constructed wetland has the advantages that the automatic operation is realized; the hydraulic load is great; the contamination index removal effect is good; the fetor and mosquito and fly breeding phenomena are reduced; the problem of freeze protection in winter can be effectively solved.

Description

Technical field [0001] The invention relates to an improvement of a constructed wetland system, in particular to a simple structure, automatic operation, unattended operation, large hydraulic load, good removal effect on BOD5, CODCr, SS, nitrogen and phosphorus and other pollution indicators, and there are few The foul smell and breeding of mosquitoes and flies can effectively solve the winter antifreeze; and it occupies a small area, has strong applicability, high removal rate, and a small composite flow underflow artificial wetland with stable effluent quality. Background technique [0002] Constructed wetland sewage treatment technology is an ecological sewage treatment technology developed in the 1970s and 1980s. It can effectively treat a variety of wastewater, such as domestic sewage, industrial wastewater, landfill leachate, ground runoff rainwater, and combined system. Sewer rainstorm overflow water, etc. According to survey statistics, tens of thousands of wetland syste...

AI Technical Summary

Problems solved by technology

[0003] From the perspective of engineering design, scholars at home and abroad divide them into surface flow constructed wetlands and subsurface flow constructed wetlands according to the different water distribution methods of the system or the different water flow methods in the system; different types of constructed wetlands have different removal effects on characteristic pollutants. Each has its own disadvantages; for example, surface-flow constructed wetlands have stench and breeding of mosquitoes and flies, and the removal efficiency of pollutants is low; subsurface flow constructed wetlands can only accept effluent that reaches or approaches the second-level water quality after first-level pretreatment

Images