Enhanced nitrogen and phosphorus removal artificial wetland system for low carbon nitrogen ratio sewage treatment

A constructed wetland system and constructed wetland technology, applied in the field of enhanced denitrification and dephosphorization constructed wetland system, can solve the problems of decreased phosphorus removal rate, short phosphorus adsorption saturation life, limited denitrification capacity, etc. Efficient removal of pollutants

Inactive Publication Date: 2018-06-29
桑德生态科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the existing engineering practice of constructed wetlands, which are mainly manifested in the effect of nitrogen and phosphorus removal. The capacity is limited; the phosphorus removal rate gradually decreases with the prolongation of the operation time. The gravel, fine sand, limestone and other substrates widely used in the market have a short adsorption saturation life for phosphorus, and the phosphorus removal rate also drops rapidly.

Method used

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  • Enhanced nitrogen and phosphorus removal artificial wetland system for low carbon nitrogen ratio sewage treatment

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Embodiment 1

[0056] This embodiment adopts the enhanced denitrification and dephosphorization artificial wetland system for sewage treatment with low carbon-to-nitrogen ratio of the present invention, and the treatment object is the tail water discharged from the sewage treatment plant. The water quality of the tail water of the sewage treatment plant is: NH 3 -N is 0.5~2mg / L; TN is 15~30mg / L; COD is 20~40mg / L; TP is 0.1~2mg / L.

[0057] In this embodiment, the design size of the first-level composite vertical subsurface flow constructed wetland II is length×width×height 2m×1m×1m, and the design dimensions of the upstream flow II1 and the downstream flow II2 are both length×width×height 1m×1m×1m , the design size of the secondary composite vertical underflow constructed wetland is consistent with that of the primary. The design size of the surface flow constructed wetland is 3cm×1cm×0.5cm, and the constructed wetland system is a brick structure.

[0058] The size of the constructed wetland...

Embodiment 2

[0064] This embodiment adopts the enhanced denitrification and dephosphorization artificial wetland system for sewage treatment with low carbon-to-nitrogen ratio of the present invention, and the treatment object is a certain low C / N domestic sewage. The water quality of the tail water of the sewage treatment plant is: NH 3 -N is 10~20mg / L; TN is 40~80mg / L; COD is 120~350mg / L; TP is 2~7mg / L.

[0065] In this embodiment, the fillers in the first downflow pool II1 and the second upflow pool III1 are iron salt modified Ca(OH) 2 , zeolite, gravel, all the other are consistent with embodiment 1.

[0066] The purified water treated by this system has been checked: NH 3 -N is 0.5~1mg / L; TN is 1~2mg / L; COD is 20~30mg / L; TP is 0.1~0.3mg / L.

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Abstract

The invention discloses an enhanced nitrogen and phosphorus removal artificial wetland system for low carbon nitrogen ratio sewage treatment. The system comprises: an influent water distribution area,a multi-stage combined step type artificial wetland treatment area and an effluent water collection area; wherein, the influent water distribution area, the multi-stage combined step type artificialwetland treatment area and the effluent water collection area are connected in sequence; the influent water distribution area is provided with an inlet water pipe; the effluent water collection area is provided with a water outlet; the multi-stage combined step type artificial wetland treatment area is composed of multi-stage artificial wetlands, the multi-stage artificial wetlands are arranged ina stepped structure from high to low in a descending order of water flow direction. The artificial wetland system combines a vertical underflow artificial wetland system with a surface flow artificial wetland, cost is reduced on the premise of efficient removal of pollutants, a nitrogen and phosphorus removal zone is arranged in the composite vertical underflow artificial wetland, nitrogen is removed while phosphorus is removed, denitrification is especially suitable for low C / N wastewater treatment, wetland can plant landscape plants and nitrogen and phosphorus removal plants without secondary pollution and with good treatment effect.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to an artificial wetland system for strengthening denitrification and dephosphorization used for sewage treatment with low carbon-to-nitrogen ratio. Background technique [0002] At present, the eutrophication of lakes is serious, and the main controlling factors are nitrogen and phosphorus. The sewage treatment process of constructed wetland not only has the characteristics of low investment and operation cost, good purification effect, convenient operation and management, but also has an ecological landscape effect. It has certain applicability for the treatment of domestic sewage, polluted surface water, non-point source sewage, tail water of sewage treatment plants and low C / N (carbon-nitrogen ratio) wastewater in villages and towns or tourist attractions. [0003] According to the characteristics of water flow in constructed wetlands, constructed wetland syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/30
CPCC02F3/302C02F3/308C02F3/32C02F2301/08
Inventor 仇智陈杰王小青魏维利王俊安文一波
Owner 桑德生态科技有限公司
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