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Secondary constructed wetland treatment system applicable to advanced nitrogen and phosphorus removal of domestic sewage

A technology for artificial wetlands and domestic sewage, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as incomplete treatment of domestic sewage, achieve efficient and stable treatment effects, avoid Wet land clogging, reducing start-up cycle effect

Pending Publication Date: 2022-07-19
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a secondary constructed wetland treatment system suitable for deep denitrification and phosphorus removal of domestic sewage, so as to solve the problem of incomplete treatment of domestic sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] In the embodiment of the present invention, a secondary constructed wetland treatment system for deep denitrification and phosphorus removal of domestic sewage includes the following steps: 1) NH 3 -The domestic sewage with N concentration of 5-10mg / L and TP concentration of 2-4mg / L is concentrated and evenly distributed through the water distribution pipe into the first-level constructed wetland treatment unit established with volcanic rock as the main filler, and the filler of the first-level constructed wetland treatment unit From top to bottom, the order is 2-4mm ceramsite (thickness is 20cm), 4-8mm Shandong volcanic rock (thickness is 60cm), 10-20mm gravel (thickness is 30cm); 2) The effluent from the primary treatment unit is concentrated and evenly distributed through the water distribution pipe The water distribution enters the secondary constructed wetland treatment unit with natural manganese sand as the main filler. The filler of the secondary constructed wet...

Embodiment 2

[0010] 1) Put NH 3 -The domestic sewage with N concentration of 5-15mg / L and TP concentration of 2-4mg / L is concentrated through the water distribution pipe and evenly distributed into the first-class constructed wetland treatment unit established with volcanic rock as the main filler. The fillers of the first-level constructed wetland treatment unit are 2-4mm ceramsite (20cm thick), 4-8mm Shandong volcanic rock (70cm thick), and 10-20mm gravel (30cm thick) from top to bottom; 2) Level 1 The effluent of the treatment unit is concentrated through the water distribution pipe and evenly distributed into the secondary constructed wetland treatment unit with natural manganese sand as the main filler. The filler of the secondary constructed wetland treatment unit is 2-4mm ceramsite (20cm thick), 4-8mm Guangxi natural manganese sand (70cm thick), 10-20mm gravel (30cm thick) from top to bottom; 3) The effluent TP can be reduced to 0.15-1.0mg / L; NH 3 -N can be reduced to 0.3-2mg / L. ...

Embodiment 3

[0012] 1) Put NH 3 -The domestic sewage with N concentration of 10-20mg / L and TP concentration of 2-5mg / L is concentrated through the water distribution pipe and evenly distributed into the first-class constructed wetland treatment unit established with volcanic rock as the main filler. The filler of the first-level constructed wetland treatment unit is 2-4mm ceramsite (20cm thick), 4-8mm Ulanqab volcanic rock (70cm thick), and 10-20mm gravel (30cm thick) from top to bottom; 2) The effluent of the primary treatment unit is concentrated and distributed uniformly through the water distribution pipe into the secondary constructed wetland treatment unit with natural manganese sand as the main filler. The filler of the secondary constructed wetland treatment unit is 2-4mm ceramsite (20cm thick), 4-8mm Henan natural manganese sand (70cm thick), 10-20mm gravel (30cm thick) from top to bottom; 3) The effluent TP can be reduced to 0.15-1.0mg / L; NH 3 -N can be reduced to 0.3-2mg / L.

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Abstract

The invention discloses a secondary constructed wetland treatment system applicable to advanced nitrogen and phosphorus removal of domestic sewage. The building method of the system comprises the following steps: (1) uniformly distributing domestic sewage through a water distribution pipe in a centralized manner, and entering the primary constructed wetland treatment unit which is built by taking volcanic rock as a main filler; the filler of the first-stage constructed wetland treatment unit sequentially comprises 2-4mm ceramsite (with the thickness of 20cm), 4-8mm volcanic rock (with the thickness of H1) and 10-20mm gravel (with the thickness of 30cm) from top to bottom; and (2) the effluent of the primary treatment unit is concentrated and uniformly distributed by a water distribution pipe and enters a secondary artificial wetland treatment unit which takes natural manganese sand as a main filler. And the filler of the secondary artificial wetland treatment unit sequentially comprises 2-4mm ceramsite (with the thickness of 20cm), 4-8mm natural manganese sand (with the thickness of H2) and 10-20mm gravel (with the thickness of 30cm) from top to bottom. After deep nitrogen and phosphorus removal through the two-stage constructed wetland, the nitrogen and phosphorus concentration of the domestic sewage effluent can reach the surface water environment quality standard. The method has the characteristics of ecological economy, efficient and stable treatment effect and the like, and can achieve the purpose of deep phosphorus and nitrogen removal.

Description

technical field [0001] The invention relates to water treatment technology and application fields, in particular to a treatment method and process for deep denitrification and dephosphorization of domestic sewage. Background technique [0002] In 2017, the total amount of water resources in my country was 2,746.25 billion m 3 , the total sewage discharge is 70 billion tons, of which nearly 18.5 billion tons of urban domestic sewage is discharged. The increase in the discharge of domestic sewage leads to the phenomenon that the effluent of the urban sewage treatment plant does not meet the standards, and the direct discharge will cause an excess of nutrients such as nitrogen and phosphorus in the water body, which will lead to the decline of the water quality, eutrophication of water bodies, black and odorous water bodies and other water bodies. pollution phenomenon. The wetlands were developed in the late 1970s, combining natural wetlands and oxidation ponds. After the 19...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
CPCC02F3/32C02F2203/006
Inventor 白雪莹李云桂吕文轩
Owner SOUTHWEAT UNIV OF SCI & TECH
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