Perpendicular unsaturated flow and vertical deflection flow compounded constructed-wetland sewage treatment system

Abstract

The invention discloses a perpendicular unsaturated flow and vertical deflection flow compounded constructed-wetland sewage treatment system, which comprises a pretreatment pool, an unsaturated-flow constructed wetland pool, a vertical-deflection-flow constructed wetland pool and a surface-flow constructed wetland pool, wherein the pretreatment pool, the unsaturated-flow constructed wetland pool,the vertical-deflection-flow constructed wetland pool and the surface-flow constructed wetland pool are communicated in sequence; the heights of the pretreatment pool, the unsaturated-flow constructedwetland pool, the vertical-deflection-flow constructed wetland pool and the surface-flow constructed wetland pool are decreased in sequence. The perpendicular unsaturated flow and vertical deflectionflow compounded constructed-wetland sewage treatment system provided by the invention has high organic-matter treatment efficiency, obvious denitrification and dephosphorization effects, a low capital-construction cost and low running and management expanses, and is simple to operate and applicable to the treatment of a low-pollution water body.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment, and in particular relates to a synthetic wetland sewage treatment system with composite vertical unsaturated flow and vertical baffle flow. Background technique [0002] The existing constructed wetland sewage treatment technology has attracted more and more attention all over the world because of its technical characteristics of high treatment efficiency, low investment cost, and simple operation and management. However, the traditional wetland treatment technology has the following disadvantages: it cannot directly treat sewage, and its adaptability is poor, and it can only be used for advanced treatment of sewage after primary or secondary treatment; the absorption efficiency of heavy metal pollutants is low; the technology is greatly affected by the ambient temperature; summer Easy to breed mosquitoes, etc. [0003] The existing constructed wetland sewage t...

AI Technical Summary

Problems solved by technology

However, the traditional wetland treatment technology has the following disadvantages: it cannot directly treat sewage, and its adaptability is poor, and it can only be used for advanced treatment of sewage after primary or secondary treatment; the absorption efficiency of heavy metal pollutants is low; the technology is greatly affected by the ambient temperature; summer Easy to breed mosquitoes, etc.

This type of constructed wetland covers a large area, has a small hydraulic load rate, limited decontamination capacity, limited oxygen transmission capacity, is greatly affected by the climate, and is prone to breed mosquitoes and flies in summer

Vertical flow wet artificial land has insufficient ability to remove organic matter, and there is also a phenomenon of breeding mosquitoes and flies in summer

Insufficient oxygen supply and poor nitrification in subsurface constructed wetlands

In recent years, people have proposed composite constructed wetland sewage treatment methods, which can combine the advantages of various types of constructed wetlands, but there are also disadvantages such as large area, unsatisfactory sewage treatment effect, and inability to make good use of the adsorption and filtration of wetland substrates. Therefore, in order to make great progress in the implementation of my country's sewage resource utilization strategy, it is of great significance to develop and research new ecological sewage purification and reuse technologies.

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