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Method for purifying sewage in vertical-flow artificial wetland

A technology of artificial wetland and vertical underflow, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of long pipelines, large construction investment, blockage, etc., and reduce construction investment , Increase water flow time, improve the effect of sewage treatment

Inactive Publication Date: 2012-08-22
张四海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing vertical flow wetland is composed of foundation pit, cofferdam, water distribution pipe network, water collection pipe network, a packing layer with a certain layer structure composed of a permeable matrix, microbial communities and vegetation attached to the packing layer, and the water distribution pipe network Covered with artificial wetlands, the pipeline is long, and the construction investment is large. In addition, due to the long pipeline, it is easy to cause blockage during sewage treatment

Method used

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  • Method for purifying sewage in vertical-flow artificial wetland
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  • Method for purifying sewage in vertical-flow artificial wetland

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The design processing capacity is 1000 tons / day, and the total area of ​​constructed wetland is 1600m 2 , divided into two grids, each grid is 800m 2 , the two grids are connected in parallel and respectively enter the water. The aspect ratio of the constructed wetland foundation pit is 1: 1, and the bottom slope of the excavated foundation pit is 0.8%, which is inclined towards the outlet of the water collection pipe. The surface slope cannot exceed 0.3m, and the depth of the foundation pit is 2.5m. The raw sewage enters the coagulation sedimentation tank through the grid for sedimentation, and then enters the aeration tank to be oxygenated and oxidized, and then the pretreated COD is reduced to below 100mg / L, and the inorganic suspended solids (SS) are reduced to below 20mg / L. The supernatant is introduced into the constructed wetland for treatment.

[0046] as the picture shows, The constructed wetland is composed of a foundation pit 7, a cofferdam 4, a water dis...

Embodiment 2

[0063] The design processing capacity is 2,000 tons / day, and the total area of ​​constructed wetland is 3,000m 2 , divided into three grids, each grid is 1000m 2 , the three grids are connected in parallel and enter water separately. The aspect ratio of the constructed wetland foundation pit is 1:3, the bottom slope of the excavated foundation pit is 0.5%, and it is inclined towards the outlet of the water collection pipe, the surface slope cannot exceed 0.3m, and the depth of the foundation pit is 1.5m. The raw sewage enters the coagulation sedimentation tank through the grid for sedimentation, and then enters the aeration tank to be oxygenated and oxidized, and then the pretreated COD is reduced to below 100mg / L, and the inorganic suspended solids (SS) are reduced to below 20mg / L. The supernatant is introduced into the constructed wetland for treatment.

[0064] The constructed wetland is composed of a foundation pit, cofferdam, water distribution pipe network, water colle...

Embodiment 3

[0081] The design processing capacity is 2,000 tons / day, and the total area of ​​constructed wetland is 3,000m 2 , divided into three grids, each grid is 1000m 2 , the three grids are connected in parallel and enter water separately. The aspect ratio of the constructed wetland foundation pit is 1:5, the slope of the bottom of the excavated foundation pit is 0.8%, inclined towards the outlet of the water collection pipe, and the depth of the foundation pit is 2.0m. The raw sewage enters the coagulation sedimentation tank through the grid for sedimentation, and then enters the aeration tank to be oxygenated and oxidized, and then the pretreated COD is reduced to below 100mg / L, and the inorganic suspended solids (SS) are reduced to below 20mg / L. The supernatant is introduced into the constructed wetland for treatment.

[0082] The constructed wetland is composed of a foundation pit, cofferdam, water distribution pipe network, water collection pipe network, a filler layer with a...

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Abstract

The invention relates to a method for purifying sewage in a vertical-flow artificial wetland. After raw sewage is pretreated, the chemical oxygen demand (COD) of the sewage is lowered below 300 mg / L and the inorganic suspended solid (SS) is reduced below 20 mg / L; supernate is introduced into the artificial wetland for treating; the artificial wetland consists of a foundation pit, a cofferdam, a water distribution pipe network, a water collecting pipe network, a filler layer which consists of a permeable substrate and has a certain number of layers, a microbial community which is attached to the filler layer and a vegetation; the bottom of the foundation pit and the cofferdam are subjected to reinforcing and anti-seepage treatment; the water distribution pipe network mainly comprises a main pipeline and a branch pipeline which is vertically connected with the main pipeline; the length of the main pipeline is 1 / 3 to 1 / 2 of that of the artificial wetland; the pipe diameter is determined by the amount of flowing water; water outlet holes which form included angles of 45 degrees with the horizontal direction are distributed on both sides of the lower part of each water distribution branch pipe; the diameter of each water outlet hole is between 10 and 20 millimeters; and the hole interval is between 5 to 10 centimeters. The purification method has low construction cost and good water treating effect.

Description

technical field [0001] The invention relates to a method for deep treatment of sewage in artificial wetlands, in particular to a method for purifying sewage in vertical underflow artificial wetlands. Background technique [0002] The use of constructed wetlands for sewage treatment is a sewage treatment technology developed in the 1980s. Since the 1990s, the sewage treatment technology of constructed wetlands has developed rapidly. At present, the most widely used new constructed wetlands are mainly subsurface flow wetlands and vertical flow wetlands. Compared with traditional free surface flow wetlands, the two have obvious advantages in improving pollutant removal efficiency and reducing land occupation. The existing vertical flow wetland is composed of foundation pit, cofferdam, water distribution pipe network, water collection pipe network, a packing layer with a certain layer structure composed of a permeable matrix, microbial communities and vegetation attached to the ...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/34
CPCY02W10/10
Inventor 张四海
Owner 张四海
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