Subsurface flow wetland device for enhanced nitrogen removal of low-pollution water

A technology for subsurface wetlands and low-pollution water, applied in the field of devices in the field of environmental engineering technology, can solve the problems of reducing the effective purification volume of wetlands, impossibility of intermittent operation, limited use and promotion, etc., to shorten the residence time and improve the removal performance , the effect of preventing excessive ammonia nitrogen

Inactive Publication Date: 2014-04-23
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, filling the hollow bricks reduces the matrix content in the wetland and reduces the effective purification volume inside the wetland; in addition, the intermit

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  • Subsurface flow wetland device for enhanced nitrogen removal of low-pollution water

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Example Embodiment

[0023] Embodiments of the present invention will be described in detail below. This embodiment is carried out on the premise of the technical solution of the present invention, and a detailed implementation mode and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0024] This example is located in Shangguan Town, Dali Bai Autonomous Prefecture, Yunnan Province. The treated water is the tail water of a village sewage purification device, and the total water volume introduced into the device is 55m 3 / d (including secondary water inflow), the water quality is determined as inferior V water according to the "Surface Water Environmental Quality Standard" (GB3838-2002), and the main pollution indicators are total nitrogen 10mg / L, ammonia nitrogen 4mg / L, and total phosphorus 0.8mg / L, COD40mg / L.

[0025] like figure 1 As shown, this embodiment includes along the water flow direction: a pretreatme...

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Abstract

The invention relates to a subsurface flow constructed wetland device for enhanced nitrogen removal in the technical field of environmental engineering. The device comprises a pretreatment settling tank, a hydraulic drop aeration well and a wetland groove, wherein the wetland groove comprises an aerobic nitrating segment, an inspection well, an anoxic denitrification segment and a water collecting well in the water flow direction; the pretreatment settling tank is used for settling suspended matters to prevent follow-up structures from being blocked; hydraulic drop steps are arranged in the hydraulic drop aeration well to increase the dissolved oxygen concentration; active substrates capable of adsorbing ammonia nitrogen are filled in the aerobic nitrating segment, a perforated aerator pipe is vertically inserted and vascular plants are planted to increase the dissolved oxygen concentration in the packing layer, so that the smooth generation of the nitrification is guaranteed; a secondary water inlet pipe is connected into the inspection well to supplement the carbon source that the denitrification requires; efficient phosphorus removal substrates are filled in the anoxic denitrification segment to generate the denitrification, adsorb and remove phosphorus pollutants; the water collecting well is used for collecting treating water and discharging the water out of the device finally. Compared with the prior art, the device disclosed by the invention has the advantages that nitrogen in sewage is well treated and both the total nitrogen removal rate and the ammonia nitrogen removal rate can be up to more than 80%.

Description

technical field [0001] The invention relates to a device in the technical field of environmental engineering, in particular to a subsurface flow artificial wetland device with enhanced denitrification function. It can be used for enhanced denitrification of low-pollution water such as tail water from urban sewage plants and farmland irrigation backwater. Background technique [0002] Low-pollution water, including tailwater from urban sewage plants, backwater from farmland irrigation, etc. Because its water quality is between the sewage treatment plant discharge standard and the surface water V standard, once it is discharged into the receiving water body, it will greatly increase the organic matter and nutrient load in the water body, so it is currently regarded as the main external cause of eutrophication in the water body one of the sources. [0003] At present, for the treatment of low-pollution water, countries all over the world adopt ecological engineering methods, ...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/30
CPCY02W10/10
Inventor 吴德意王哲林丽丹孔海南
Owner SHANGHAI JIAO TONG UNIV
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