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Method for constructing enhanced denitrification artificial wetland, artificial wetland, and enhanced denitrification method

A constructed wetland and denitrification technology, applied in chemical instruments and methods, aerobic and anaerobic process treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult control of effluent water quality, waste of sulfur resources, and denitrification efficiency Slow and other problems, to achieve the effect of stable effluent total nitrogen (TN, strong impact load resistance, convenient operation and management)

Inactive Publication Date: 2019-07-19
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Nitrate (NO 3 -N) has a good removal effect, but the separate sulfur autotrophic denitrification is applied to the construction cost of the constructed wetland, and the SO in the effluent quality 4+ -N content is high, the effluent water quality is not easy to control, and it is difficult to promote large-scale application in practical engineering applications
[0007] At present, there is no report on the combined process of heterotrophic denitrification coupled with sulfur autotrophic denitrification constructed wetland
[0008] Traditional subsurface flow wetlands based on heterotrophic denitrification technology have slow denitrification efficiency and low treatment hydraulic load, and for the low C / N ratio of sewage treatment plant tail water, subsurface flow wetland systems are difficult to pass naturally in engineering applications. Heterotrophic denitrifying bacteria are cultivated by hanging film, and excessive addition and release of C source will lead to high COD in the effluent
[0009] The subsurface wetland of the autotrophic denitrification system based on sulfur autotrophic denitrification technology is resistant to hydraulic shock loads, has high treatment efficiency, and has a stable removal effect on pollutants in water bodies. The growth environment of denitrification is suitable for anaerobic zone or facultative anaerobic zone, and the DO in the upper layer of subsurface wetland system is high), which will not only cause waste of sulfur resources, but the entire space of subsurface wetland cannot be effectively used, and to a certain extent will lead to The sulphate content in the effluent is high, which is related to the Ca content in the filler matrix + The ions undergo a chemical reaction to form precipitates that cause blockage of the entire system

Method used

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  • Method for constructing enhanced denitrification artificial wetland, artificial wetland, and enhanced denitrification method
  • Method for constructing enhanced denitrification artificial wetland, artificial wetland, and enhanced denitrification method
  • Method for constructing enhanced denitrification artificial wetland, artificial wetland, and enhanced denitrification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Example 1 Establishment of Downward Vertical Subsurface Flow Coupled Sulfur Autotrophic Denitrification Constructed Wetland

[0096] 1. Build subsurface artificial wetlands

[0097] 1-1) Excavation of constructed wetland bed

[0098] In the sewage area to be treated, excavate a subsurface flow artificial wetland bed with a depth of 2m (usually <3m), set a water inlet on the upper part of the artificial wetland bed, connect with the water inlet, and introduce sewage into the artificial wetland; open a water outlet at the bottom, and connect with the water inlet The outlet pipes are connected to lead the outlet water after enhanced denitrification treatment to the constructed wetland;

[0099] 1-2) Preparation of filler

[0100] 1-2A) Mix sulfur, limestone, zeolite and volcanic rock with a particle size of 30 to 35 mm evenly to prepare the filler in the sulfur packing area, that is, sulfur / limestone / zeolite / volcanic rock filler, wherein sulfur, limestone, zeolite, and v...

Embodiment 2

[0129] Taking the effluent from the filter cloth filter room of a sewage treatment plant in Changge City as an example to carry out enhanced denitrification treatment, the amount and quality of sewage water are shown in Table 2.

[0130] 1. Build subsurface artificial wetlands

[0131] 1-1) Excavation of constructed wetland bed

[0132] A subsurface artificial wetland bed was constructed in the filter cloth filter workshop of a sewage treatment plant in Changge City. The size of the wetland bed was: length×width×height (80cm×30cm×100cm), and the depth of the wetland bed was 100cm (that is, the wetland planting area , corn cob packing area, and the sum of the heights of the sulfur packing area is 100cm).

[0133] 1-2) Preparation of filler

[0134] 1-2A) Mix sulfur, limestone, zeolite and volcanic rock with a particle size of 30 to 35 mm evenly to prepare the filler in the sulfur packing area, that is, sulfur / limestone / zeolite / volcanic rock filler, wherein sulfur, limestone, ...

Embodiment 3

[0153] In addition to step 3) the influent flow rate during the system operation is 555mL / min, and the hydraulic retention time of the sewage in the subsurface constructed wetland is 15h (among them, the hydraulic retention time of the corn cob filling area is 10h, and the hydraulic retention time of the sulfur filling area is 5h ), the influent pH was basically maintained at 7.42-7.45, the DO was basically maintained between 2.15-2.45, and the rest were the same as in Example 2.

[0154] See Table 2 for the measurement results of the effluent water quality (COD, nitrate, ammonia nitrogen, total phosphorus) after the sewage is treated by the subsurface flow constructed wetland. As can be seen from the water quality measurement results in Table 2: adopting the subsurface flow constructed wetland of the present invention to treat municipal sewage, the removal effect is remarkable, and the denitrification effect is obvious, wherein NO 3 The removal rate of -N can reach 97.38%; th...

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Abstract

The invention discloses an underground flow artificial wetland for carrying out enhanced denitrification treatment on C / N ratio sewage, and a construction method thereof, and a method for carrying outenhanced denitrification treatment on low C / N ratio sewage. The construction method comprises: excavating an underground flow artificial wetland bed in a to-be-treated sewage pool; carrying out enhanced denitrification treatment on sewage by using the artificial wetland, wherein the treatment comprises: uniformly distributing water at a top layer plant planting zone, and carrying out heterotrophic denitrification treatment through a corn cob filler zone; and carrying out autotrophic denitrification treatment through a sulfur filler zone, wherein the deep denitrification is achieved and the sewage denitrification efficiency is improved through the heterotrophic and autotrophic combined treatment. Compared with the traditional vertical flow artificial wetland, the underground flow artificial wetland of the invention does not need the arrangement of the aeration device, has characteristics of high denitrification efficiency, high total nitrogen removal rate, high nitrate removal rate, especially high nitrate nitrogen removal efficiency, simple operation and easy management, and greatly improves the deep denitrification performance of the artificial wetland to the sewage plant tail water.

Description

technical field [0001] The invention relates to the deep removal of nitrogen in the tail water of a sewage plant, belongs to the application field of sewage advanced treatment technology, and especially relates to the treatment of nitrate nitrogen (NO 3 -N) and ammonia nitrogen (NH 4 -N) removal. To be precise, the system is divided into an aerobic denitrification zone and a facultative anaerobic autotrophic denitrification zone. The microorganisms in the aerobic zone use C source as the electron donor for heterotrophic denitrification; the facultative anaerobic zone mainly uses sulfur as Electron donor, nitrate nitrogen (NO 3 -N) and nitrite nitrogen (NO 2 -N) as an electron acceptor for deep denitrification of sewage plant tail water by sulfur autotrophic denitrifying bacteria. Background technique [0002] The tail water of the sewage plant has the characteristics of low C / N ratio. Generally, the advanced treatment of the tail water of the sewage plant includes biolog...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/34C02F3/30
CPCC02F3/302C02F3/305C02F3/32C02F3/34
Inventor 王洪杰宋孟李莹莹李棒
Owner BEIJING FORESTRY UNIVERSITY
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