CN202046970U - Sewage purification system giving priority to constructed wetlands - Google Patents

Abstract

The utility model relates to a sewage purification system mainly based on artificial wetlands, comprising a sedimentation tank, a vertical flow artificial wetland and a horizontal undercurrent artificial wetland, the sedimentation tank is connected with the horizontal undercurrent artificial wetland through the vertical flow artificial wetland, wherein the vertical flow artificial wetland The bottom and inner wall of the wetland and the horizontal subsurface flow constructed wetland are all covered with waterproof felt, and the waterproof felt is coated with a waterproof layer; above the waterproof layer of the vertical flow constructed wetland, a layer of water distribution pipes distributed in a net shape is arranged. Waterproof felt and waterproof layer are laid on the bottom of the artificial wetland in this system, which can effectively prevent sewage from leaking, thereby avoiding pollution of groundwater resources; in addition, the net-shaped water distribution pipe layer at the bottom of the artificial wetland is used to remove most of the suspended solids and falling off at the bottom of the wetland bed Regular flushing of the biofilm to prevent blockage and deposition in the wetland bed, significantly increase the water output per unit area of the wetland, and maximize the purification effect of the wetland.

Description

A sewage purification system based on artificial wetlands

technical field

The utility model belongs to the technical field of sewage treatment, in particular to a sewage purification system mainly based on artificial wetlands. the

Background technique

As an ecological sewage treatment technology, constructed wetland has the characteristics of low construction cost and operation cost, good treatment effect, ecological restoration function and ecological landscape creation. In recent years, artificial wetland technology has gradually attracted people's attention and has been applied in some areas. However, the existing technology often has the problems of large area, small water output, easy blockage, and low efficiency. the

Utility model content

The purpose of the utility model is to overcome the deficiencies of the existing technology, and provide a sewage purification system mainly based on artificial wetlands. This system can effectively solve the problems of the existing artificial wetland sewage treatment systems, which occupy a large area, have small water output, and are easy to be blocked. Low efficiency and other issues. the

In order to achieve the above object, the utility model adopts the following technical solutions:

A sewage purification system mainly based on constructed wetlands, including sedimentation tanks, vertical flow constructed wetlands and horizontal subsurface flow constructed wetlands, the sedimentation tanks are connected to horizontal subsurface flow constructed wetlands through vertical flow constructed wetlands, wherein the vertical flow constructed wetlands and horizontal subsurface flow constructed wetlands The bottom and inner wall of the subsurface constructed wetland are covered with waterproof felt, and the waterproof felt is coated with a waterproof layer (to prevent sewage from seeping and polluting groundwater).

Above the waterproof layer of the vertical flow artificial wetland, there is a layer of water distribution pipes distributed in a network shape, and the water distribution pipes are fed intermittently. the

The vertical flow and/or horizontal subsurface flow artificial wetland includes a wetland bed and aquatic plants planted above the wetland bed. The wetland bed has a three-layer structure, which is a gravel layer, a crushed stone layer and a fine sand layer from bottom to top. the

The aquatic plants are preferably reeds, water peanuts, calamus, rhizomes or water hyacinths and the like. the

The sewage first passes through the sedimentation tank to remove coarse particles and suspended solids, and then flows into the bottom of the vertical flow constructed wetland, distributes water from the water distribution pipes installed on the entire bottom of the wetland, then flows upwards evenly for preliminary degradation, and then flows from the vertical flow The water outlet at the upper end of the constructed wetland flows into the water inlet of the horizontal subsurface flow constructed wetland, and finally flows out from the gravel layer, so that pollutants can be further removed. the

The water flow direction of the vertical flow artificial wetland distribution pipe is upward flow, and its water intake method is intermittent water intake to ensure sufficient contact between the sewage and the plant root system, and make full use of the plant root system to provide a better aerobic environment and enhance the nitrification effect , the bottom is equipped with water distribution pipes that are distributed in a mesh and also serves as a film-guided flushing system for the wetland bed. The net-shaped water distribution pipes at the bottom of the constructed wetland bed are used for the flushing function, and the water inlet method is the spray type, which is opened regularly to flush most of the suspended solids and shed biofilms deposited at the bottom of the constructed wetland bed regularly. Prevents clogging deposits in wetland beds. the

The utility model has beneficial effects: the bottom of the artificial wetland is laid with a waterproof felt and a waterproof layer, which can effectively prevent sewage from leaking, thereby avoiding pollution of underground water resources. In addition, this system uses the net-shaped water distribution pipe layer at the bottom of the artificial wetland to regularly flush most of the suspended matter and the shed biofilm at the bottom of the wetland bed to prevent blockage and deposition in the wetland bed, and significantly improve the yield per unit area of the wetland. The amount of water, the maximum space to improve the effect of the wetland. At the same time, by changing the hydraulic flow state inside the wetland, intermittent upward vertical flow is adopted, and the plant root system is fully utilized to improve the oxygen transmission capacity, which has better BOD, COD removal capacity and nitrification reaction capacity. the

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of the sewage purification system described in the present invention.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings, but the protection scope of the utility model is not limited thereto. the

As shown in Figure 1, a sewage purification system based on constructed wetlands includes a sedimentation tank 1, a vertical flow constructed wetland 2 and a horizontal subsurface flow constructed wetland 3. The sedimentation tank 1 passes through the vertical flow constructed wetland 2 and the horizontal subsurface flow constructed wetland 3 Connection (that is, the outlet 5 of sedimentation tank 1 is connected with the lower water inlet 6 of the vertical flow constructed wetland 2, the upper water outlet 7 of the vertical flow constructed wetland 2 is connected with the upper water inlet 8 of the horizontal subsurface flow constructed wetland 3, and the lower end of the horizontal submerged flow constructed wetland is provided with a water outlet 9. Among them, the bottom and inner wall of the vertical flow constructed wetland 2 and the horizontal subsurface flow constructed wetland 3 are laid with waterproof felts 21, 31, and the waterproof felts 21, 31 are coated with waterproof layers 22, 32 respectively. The waterproofing of the vertical flow constructed wetland 2 Layer 22 top is provided with the water distribution pipe layer 23 that is distributed in net shape, and the water distribution pipe water intake mode is intermittent water inflow.Vertical flow constructed wetland 2 comprises wetland bed and the aquatic plant reed 27 planted on the wetland bed top, and this wetland bed is three Layer structure, from bottom to top are gravel layer 24, gravel layer 25 and fine sand layer 26. Horizontal subsurface flow constructed wetland 3 includes wetland bed and aquatic plant corners 36 planted above the wetland bed, and the wetland bed has a three-layer structure , followed by gravel layer 33, gravel layer 34 and fine sand layer 35 from bottom to top.

The working principle and characteristics of this system: Sewage flows into the sedimentation tank 1 from the water inlet 4 of the sedimentation tank 1, and after being removed of coarse particles and suspended solids, it flows into the vertical flow artificial wetland 2 through the water outlet 5 and the water inlet 6, and passes through the wetland After the bed purification treatment, it enters the horizontal subsurface flow artificial wetland 3 from the water outlet 7 and the water inlet 8 to be purified again, and finally flows out from the water outlet 9 . The water treated by this system can reach the secondary standard of "Urban Sewage Discharge Standard" (GB18918-2002). the

Finally, it should be noted that: the above embodiments are only used to illustrate and not limit the technical solution of the utility model, any modification or equivalent replacement of the utility model, and any modification or partial replacement without departing from the spirit and scope of the utility model , which should all be included in the scope of claims of the present utility model. the

Claims (3)

1. A sewage purification system based on constructed wetlands, comprising sedimentation tanks, vertical flow constructed wetlands and horizontal subsurface flow constructed wetlands, the sedimentation tanks are connected with horizontal subsurface flow constructed wetlands through vertical flow constructed wetlands, characterized in that the vertical flow The bottom and inner wall of the constructed wetland and the horizontal subsurface flow constructed wetland are covered with waterproof felt, and the waterproof felt is coated with a waterproof layer. 2. The sewage purification system based on constructed wetlands as claimed in claim 1, characterized in that, above the waterproof layer of the vertical flow constructed wetlands, there is a layer of water distribution pipes distributed in a network shape, and the water inlet mode of the water distribution pipes is intermittent Ingress of water. 3. The sewage purification system based on constructed wetlands as claimed in claim 1 or 2, wherein said vertical flow and/or horizontal subsurface flow constructed wetlands comprise a wetland bed, which is a three-layer structure, from bottom to bottom The upper layer is followed by gravel layer, crushed stone layer and fine sand layer.

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