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Subsurface flow constructed wetland for sewage denitrification treatment, construction method of subsurface flow constructed wetland and denitrification treatment method for sewage

A technology of artificial wetlands and construction methods, applied in biological water/sewage treatment, water/sludge/sewage treatment, special compound water treatment, etc., can solve the problem of affecting the quality of effluent water, waste, and denitrification can not achieve the desired effect, etc. question

Inactive Publication Date: 2018-10-16
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the heterotrophic denitrification technology is applied to the secondary treatment process of influent water with low organic load, groundwater and municipal sewage treatment, there will be insufficient carbon sources. At this time, it is necessary to add additional organic matter to provide carbon sources. resulting in increased operating costs
When adding organic matter, in the case of large fluctuations in water quality, it is often impossible to add accurately. If the amount is too much, it will cause waste and affect the water quality of the effluent. When the amount is insufficient, the denitrification effect cannot be achieved.

Method used

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  • Subsurface flow constructed wetland for sewage denitrification treatment, construction method of subsurface flow constructed wetland and denitrification treatment method for sewage
  • Subsurface flow constructed wetland for sewage denitrification treatment, construction method of subsurface flow constructed wetland and denitrification treatment method for sewage
  • Subsurface flow constructed wetland for sewage denitrification treatment, construction method of subsurface flow constructed wetland and denitrification treatment method for sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] 1. Build the front bed of subsurface flow artificial wetland

[0113] 1-1) Excavation of constructed wetland bed

[0114] In the sewage area to be treated, excavate a subsurface flow constructed wetland bed with a depth of 2m (usually 2 (preferably 1 piece / m 2 ); the aperture size of the through-flow hole is 4-8mm (preferably 6mm); the ratio of the water distribution area to the volume of the constructed wetland bed is 10-20:100, (preferably 15:100); the water catchment area The ratio to the volume of the constructed wetland bed is 10-20:100, (preferably 15:100); the ratio of the treatment area to the volume of the constructed wetland bed is 60-80:100 (preferably 70:100) 100).

[0115] The size of the subsurface constructed wetland of the present invention is excavated according to the technical specifications of the constructed wetland sewage treatment engineering, wherein the aspect ratio should be controlled below 3:1, and the water depth should be 0.4m-1.6m.

[0...

Embodiment 2

[0158] Taking the effluent from the filter cloth filter of a sewage treatment plant in Changge City as an example to carry out enhanced denitrification treatment, the amount and quality of sewage water are shown in Table 4.

[0159] 1. Build the front bed of subsurface flow artificial wetland

[0160] 1-1) Excavation of constructed wetland bed

[0161] A subsurface artificial wetland bed was constructed in the filter cloth filter workshop of a sewage treatment plant in Changge City. The size of the wetland bed was: length×width×height (80cm×30cm×50cm), and the water depth of the wetland bed was 40cm (that is, the wetland treatment area The height is 40cm), and then arrange two partition walls with through-flow holes in the wetland bed to separate the wetland bed into three relatively independent water distribution areas, treatment areas and water collection areas arranged in sequence along the water flow direction; , the density of through-flow holes is 1 / m 2 The aperture of...

Embodiment 3

[0200] Except for step 5) during the system operation, the influent flow rate is 83.3mL / min, the hydraulic retention time of the sewage in the subsurface flow constructed wetland is 6h, the pH of the influent water is basically maintained at 7.56-8.39, and the DO is basically maintained between 4.5-6.0. Same as Example 2.

[0201] See Table 4 for the measurement results of the effluent water quality (COD, nitrate, ammonia nitrogen, total phosphorus) after the sewage is treated by the subsurface flow constructed wetland. As can be seen from the water quality measurement results of Table 4: adopting the subsurface flow constructed wetland of the present invention to treat municipal sewage, the removal effect is remarkable, and the denitrification effect is obvious, wherein the nitrate removal rate reaches 98.40%; the ammonia nitrogen removal rate is 79.63%; the total nitrogen removal rate is 79.63%. 96.36%, the pH of the effluent is basically maintained at 6.87-7.54.

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Abstract

The invention relates to a subsurface flow constructed wetland based on treatment of sewage with a low C / N ratio, a construction method of the subsurface flow constructed wetland and an enhanced denitrification treatment method for the sewage with the low C / N ratio. The method comprises the following steps: a subsurface flow constructed wetland bed is dug in sewage land to be treated, and 2 partition walls are arranged in the bed to divide the constructed wetland bed into three relatively-independent zones including a water distribution zone, a treatment zone and a water collection zone whichare arranged in sequence along the direction of a water flow; the interior of the treatment zone is sequentially filled with a sulphur / zeolite / gravel layer and a fine gravel / zeolite layer from the bottom to the top; activated sludge is poured into the subsurface flow constructed wetland bed, and membrane forming treatment is performed; the subsurface flow constructed wetland bed is filled with a soil layer, and aquatic plants are planted in the soil layer; and the sewage is poured into the subsurface flow constructed wetland, constructed wetland start-up treatment is performed, microbial acclimation treatment is performed, and therefore the subsurface flow constructed wetland for the sewage treatment is constructed. According to the methods disclosed by the invention, the sewage is processed by utilizing the constructed wetland, the nitrogen removal efficiency is high, and a removal rate of total nitrogen and a nitrate is high.

Description

field of invention [0001] The invention belongs to the technical field of water treatment, and specifically relates to an enhanced denitrification treatment system for sewage, a construction method thereof and an enhanced denitrification treatment method, in particular to an underflow constructed wetland for denitrification treatment of sewage with a low C / N ratio, Its construction method and enhanced denitrification treatment method. Background of the invention [0002] Nitrogen and phosphorus are the controlling factors of eutrophication in most water bodies. Nitrogen and phosphorus in the tailwater of sewage treatment plants are one of the main factors causing eutrophication in lakes and other water bodies. For closed waters such as lakes and reservoirs, when the total inorganic nitrogen content in the water body is greater than 0.2mg / L, and the total phosphorus is greater than 0.01mg / L, it may cause algal blooms. Among them, nitrogen pollution is an important reason fo...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/34C02F3/30C02F101/16
CPCC02F3/302C02F3/32C02F3/34C02F2305/06C02F2101/16
Inventor 王洪杰仇智梁帅
Owner BEIJING FORESTRY UNIVERSITY
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