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Deep bed underflow process for enhanced nitrogen removal advanced treatment of low-pollution sewage

A technology with advanced treatment and low pollution, which is applied in the field of deep bed undercurrent to ensure stable operation.

Pending Publication Date: 2020-08-11
山东省环科院环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] Aiming at the deficiencies of existing subsurface flow constructed wetlands, the present invention proposes a deep bed subsurface flow process capable of strengthening denitrification advanced treatment of low-pollution sewage and ensuring stable operation

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  • Deep bed underflow process for enhanced nitrogen removal advanced treatment of low-pollution sewage

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specific Embodiment

[0050] The flow rate of the treated sewage treatment plant tail water is 20000m 3 / d, wherein the average water depth of the aerobic stabilization pond 4 is 0.8m, and the hydraulic retention time is 0.6d.

[0051] The aeration drop weir 7 between the first-level surface flow wetland and the second-level surface flow wetland is separated. The design drop height of the aeration drop weir 7 is 60cm, and the design drop depth is 20cm. The total area of ​​the surface flow wetland is 12000m 2 . The ratio of the length of the primary surface flow wetland to the length of the secondary surface flow wetland is 1:2. The aspect ratio of each level of surface flow wetland is 3:1.

[0052] The design average water depth of the first-level surface flow wetland is 0.6m, and the nitrifying bacteria agent is added to the first-level surface flow wetland. The lower is 0.4kg / m 3 .

[0053] The average design water depth of the secondary surface flow wetland is 0.8m, and the surface hydraul...

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Abstract

The invention relates to a deep bed underflow process for enhanced nitrogen removal advanced treatment of low-pollution sewage. According to the process, sewage is enabled to flow through a surface flow constructed wetland and a deep bed horizontal subsurface flow wetland in sequence; the surface flow constructed wetland comprises a first-stage surface flow wetland and a second-stage surface flowwetland; a nitrifying bacteria inoculant is added into the first-stage surface flow wetland; an aeration drop weir is arranged at the tail end of the first-stage surface flow wetland; wherein the deep-bed horizontal subsurface flow wetland is sequentially paved with a breathable impermeable sand layer, a filter layer, a denitrifying bacterium agent composite carbon source layer and an ecological gravel filler layer from bottom to top; tail water of the surface flow constructed wetland enters the deep bed horizontal subsurface flow wetland through a water collecting weir and a water passing culvert pipe and then is discharged through a water distribution channel, a subsurface flow wetland main body and a water collecting channel of the deep bed horizontal subsurface flow wetland. Accordingto the invention, the problems of nitrification reaction aeration of the subsurface wetland, lack of a carbon source in denitrification and low hydraulic load and large occupied area of the subsurfacewetland are solved, the stable operation of artificial constructed wetland system is ensured, and the low-pollution sewage is subjected to deep enhanced denitrification treatment.

Description

technical field [0001] The invention relates to a deep bed subsurface flow method for advanced treatment of low-pollution sewage, and belongs to the technical field of subsurface flow constructed wetlands. Background technique [0002] Constructed wetland is an ecological treatment technology that uses natural processes to purify wastewater. It has the advantages of low infrastructure operation costs, convenient management, and beautifying the environment. It has outstanding application advantages in watershed pollution control in developing regions. Constructed wetlands can operate in different hydraulic ways, including surface flow constructed wetlands, horizontal subsurface flow constructed wetlands, and vertical flow constructed wetlands. Constructed wetlands can effectively treat water with a water quality concentration between the second standard of GB 18918 in the Discharge Standard of Pollutants for Urban Sewage Treatment Plants and the Class Ⅳ standard of GB 3838 in...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F101/16
CPCC02F9/00C02F2101/16C02F2209/08C02F1/001C02F3/02C02F3/302
Inventor 靖玉明薛墨溪张金勇李洁琳盖丽红
Owner 山东省环科院环境工程有限公司