A multi-stage composite ecological filter for treating domestic sewage in villages and towns

Abstract

The invention discloses a multistage combined ecological filter for treating domestic wastewater of villages and towns, which mainly comprises a co-anaerobic module and four biochemical ecological modules, the internal structures of the four biochemical ecological modules are identical, wherein the biochemical ecological modules respectively comprise four reaction units, i.e. a contact oxidation tank, an inclined tube sedimentation tank, a first-stage biological tower layer and a second-stage biological tower layer. The cross section of the co-anaerobic module is square, while the cross section of the biochemical ecological module is trapezoidally radial, and the biochemical ecological modules are connected through overflow channels to form the multistage combined ecological filter, the cross section of which is square. The peripheral bottom of the whole filter is provided with a slab culvert. The multistage combined ecological filter sufficiently utilizes the advantages of each treatment process, moreover, the land area occupied by the system is reduced effectively, the multistage combined ecological filter has high capability of resisting water quality change and hydraulic loading shock, and the effluent quality of the system and the stability of system operation are improved comprehensively. Moreover, the biochemical ecological modules can rest in turns, and thereby the filling blockage phenomenon of the first-stage biological tower layer and the second-stage biological tower layer are reduced effectively.

Description

technical field [0001] The invention relates to the technical field of domestic sewage treatment, in particular to a multi-stage composite ecological filter for treating domestic sewage in villages and towns. Background technique [0002] At present, the main body of urban sewage treatment application process can be basically divided into two categories: biological method and ecological method. The biological treatment methods of domestic sewage in villages and towns mainly refer to the processes of urban sewage treatment plants, including SBR, A / O process, biological contact oxidation, etc. The biological contact oxidation method is the most commonly used because of its simple operation and maintenance. The ecological sewage treatment process is widely used to treat domestic sewage in villages and towns because of its low operating cost, convenient management, and good nitrogen and phosphorus removal effects. Among them, the most representative treatment systems are subsur...

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Problems solved by technology

[0004] At present, the ecological treatment process, especially the land treatment system, is widely used to treat domestic sewage in villages and towns because of its low operating costs, convenient management, and good nitrogen and phosphorus removal effects. However, it occupies a large area and the treatment effect is greatly affected by climate and incoming water. Land resources in rural areas of our country are becoming increasingly scarce, especially in the north where there is a long low temperature period in winter and the water volume and organic load change coefficient is large, so it is not suitable to use ecological processes alone to treat domestic sewage

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