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Ecological purification system for strengthening nitrate nitrogen removal in low C/N river and lake water body

An ecological purification, nitrate nitrogen technology, applied in the direction of biological water/sewage treatment, water/sludge/sewage treatment, polluted waterway/lake/pond/river treatment, etc., can solve the problem of irreplaceable, high release, Wetland effluent organic pollutants exceed the standard, etc., to achieve the effect of easy maintenance, flexible operation, and no secondary pollution

Pending Publication Date: 2019-08-20
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the previous analysis, it can be seen that directly adding natural materials such as corncobs into wetlands or using them to prepare wetland substrates has the disadvantages of being irreplaceable, and there is a risk of excessive release of organic pollutants in wetland effluent.
In view of the above problems, the present invention proposes an ecological purification system centering on constructed wetlands and strengthening nitrate nitrogen in low C / N river and lake water bodies, which can solve the problem of carbon source replacement, and can further ensure that the effluent water quality is up to standard and stable

Method used

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  • Ecological purification system for strengthening nitrate nitrogen removal in low C/N river and lake water body
  • Ecological purification system for strengthening nitrate nitrogen removal in low C/N river and lake water body
  • Ecological purification system for strengthening nitrate nitrogen removal in low C/N river and lake water body

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Effect test

Embodiment 1

[0056] An ecological purification system that strengthens the removal of nitrate nitrogen from low C / N river and lake water, including water regulation ponds connected in sequence along the flow direction, trash racks, carbon release ponds, horizontal underflow artificial wetlands and submerged plant ponds, carbon release A removable carbon-releasing bed is set in the pond, and each treatment unit (including water volume regulating pond, trash rack, carbon-releasing pond, subsurface constructed wetland and submerged plant pond) is arranged in a gradually decreasing ladder shape.

[0057] The hydraulic retention time of the regulating pond is 2h.

[0058] The gap between the bars of the trash rack is 3cm.

[0059] The water depth of the carbon release pond is 1.5m, and the hydraulic retention time is 12h. The carbon-releasing bed includes an external grid-type framework and gravel and natural cellulose carbon sources filled in the framework, wherein the external framework is m...

Embodiment 2

[0065] An ecological purification system that strengthens the removal of nitrate nitrogen from low C / N river and lake water, including water regulation ponds connected in sequence along the flow direction, trash racks, carbon release ponds, vertical underflow artificial wetlands and submerged plant ponds, carbon release A removable carbon-releasing bed is set in the pond, and each treatment unit (including water volume regulating pond, trash rack, carbon-releasing pond, subsurface constructed wetland and submerged plant pond) is arranged in a gradually decreasing ladder shape.

[0066] The hydraulic retention time of the regulating pond is 3h.

[0067] The gap between the bars of the trash rack is 1 cm.

[0068] The water depth of the carbon release pond is 1.5m, and the hydraulic retention time is 24h. The carbon-releasing bed includes an external grid-type framework and gravel and natural cellulose carbon sources filled in the framework, wherein the external framework is ma...

Embodiment 3

[0073] An ecological purification system that strengthens the removal of nitrate nitrogen from low C / N river and lake water, including water regulation ponds connected in sequence along the flow direction, trash racks, carbon release ponds, horizontal underflow artificial wetlands and submerged plant ponds, carbon release A removable carbon-releasing bed is set in the pond, and each treatment unit (including water volume regulating pond, trash rack, carbon-releasing pond, subsurface constructed wetland and submerged plant pond) is arranged in a gradually decreasing ladder shape.

[0074] The hydraulic retention time of the regulating pond is 1h.

[0075] The gap between the bars of the trash rack is 5cm.

[0076] The water depth of the carbon release pond is 1.0m, and the hydraulic retention time is 6h. The carbon-releasing bed includes an external grid-type framework and gravel and natural cellulose carbon sources filled in the framework, wherein the external framework is ma...

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Abstract

The invention relates to an ecological purification system for strengthening the nitrate nitrogen removal in a low C / N river and lake water body. The system comprises a water volume regulating pond, asewage intercepting apparatus, a carbon releasing pond, a subsurface flow artificial wetland and a submerged plant pond which sequentially communicate along the water flow direction, and a carbon releasing apparatus that can be removed is arranged inside the carbon releasing pond. The carbon releasing pond is arranged in front of the subsurface flow artificial wetland, the agricultural and forestry waste is fully utilized to release a carbon source, the carbon source required for the heterotrophic denitrification of the subsequent artificial wetland system can be supplemented, and the removalefficiency of the nitrate nitrogen by the wetland system is improved. When the carbon source release rate is low or the release is stopped, a carbon releasing bed can be replaced at any time, the optimal design can be carried out according to the feeding water quality, and the operation is more flexible. The submerged plant pond is arranged behind the subsurface flow artificial wetland, the residual carbon source and nutrient concentration can be further reduced, the secondary pollution problem caused by the excessive release of the carbon source is avoided, and the outlet water quality is ensured to reach the standard.

Description

technical field [0001] The invention relates to the technical field of water body environment restoration, in particular to an ecological purification system for strengthening the removal of nitrate nitrogen from low C / N river and lake water. Background technique [0002] As important resources and environmental carriers, rivers and lakes are important factors affecting urban form and environment. In view of the current situation of water shortage in my country, the use of recycled water, an unconventional water resource, for the recharge of rivers and lakes has been widely used. However, when recycled water is discharged into surface water bodies, there is a certain risk of cyanobacteria blooms. Taking Beijing as an example, according to the "Discharge Standards of Water Pollutants for Urban Sewage Treatment Plants in Beijing" (DB11 / 890-2012), starting from December 31, 2015, the existing sewage treatment plants in central cities will implement the standards listed in Tabl...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F3/32C02F101/16
CPCC02F3/28C02F3/32C02F2101/163C02F2103/007
Inventor 曲丹余昊翔马世沅邱斌刘永泽
Owner BEIJING FORESTRY UNIVERSITY
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