Composite artificial marsh sewage treatment system

Abstract

The invention discloses a composite artificial marsh sewage treatment system which comprises a pretreating pool. The pretreating pool is communicated with a vertical flow artificial marsh pool. The lower part of the vertical flow artificial marsh pool is provided with a horizontal submerged flow artificial marsh pool which is arranged under the ground surface. The vertical flow artificial marsh pool is communicated with the horizontal submerged flow artificial marsh pool through a reflux pool. The matrix in the vertical flow artificial marsh pool is sequentially provided with a first coarse sand layer, a first artificial mixing layer and a gravel layer from top to bottom. Both sides of the horizontal submerged flow artificial marsh pool are provided with a gravel zone, and the middle part is a substrate zone. The substrate zone is sequentially provided with a third coarse sand layer, a second artificial mixing layer and a second gravel layer from top to bottom. The shallow-rooted plants are planted in the verticalflow artificial marsh pool. The deep-rooted plants are planted in the horizontal submerged flow artificial marsh pool. The upper part of the vertical flow artificial marsh pool is provided with a water distributing pipe, and the lower part is provided with a first drainage groove. The lower part of the horizontal submerged flow artificial marsh pool is provided with a second drainage groove. The invention has the advantages of high sewage treatment efficiency, good water outlet quality and small land occupation area.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a composite artificial wetland sewage treatment method. Background technique [0002] With the rapid development of my country's social economy and the acceleration of urbanization, on the one hand, the contradiction between urban water supply and demand has become increasingly prominent, and on the other hand, the massive discharge of huge amounts of waste water and sewage has continuously polluted water sources, further deteriorating the water quality environment. At present, among the more than 600 cities in our country, more than 400 cities have different degrees of water shortage problems. The annual water shortage reaches 6 billion tons, and the economic loss caused by water shortage is nearly 300 billion yuan per year. At the same time, the annual sewage discharge in my country's cities has reached 41.4 billion tons. After these huge amounts of sewage enter the surface wate...

AI Technical Summary

Problems solved by technology

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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