Method and system for denitrifying low-carbon high-nitrogen sewage by utilizing plant carbon source-enhanced artificial wetland

A constructed wetland, low-carbon and high-nitrogen technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. Nitrification denitrification effect is good, the extraction method is simple, and the effect of strong carbon release ability

Active Publication Date: 2014-07-23
JINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the poor denitrification and denitrification effect of existing constructed wetlands for treating low-carbon and high-nitrogen sewage, the present invention provides a method for denitrifying low-carbon and high-nitrogen sewage by using plant carbon sources to strengthen constructed wetlands, using abandoned crops or wetlands Plant straw, combined with scientific dosing methods, can improve the denitrification and denitrification effect of constructed wetlands in the treatment of low-carbon and high-nitrogen sewage

Method used

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  • Method and system for denitrifying low-carbon high-nitrogen sewage by utilizing plant carbon source-enhanced artificial wetland
  • Method and system for denitrifying low-carbon high-nitrogen sewage by utilizing plant carbon source-enhanced artificial wetland
  • Method and system for denitrifying low-carbon high-nitrogen sewage by utilizing plant carbon source-enhanced artificial wetland

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Embodiment 1

[0047] This embodiment provides a system that uses plant carbon sources to strengthen constructed wetlands to denitrify low-carbon and high-nitrogen sewage. The main structure is shown in the attached figure 1 shown, with figure 1 Among them, 1 is the hydrolyzate release pool, 2 is the main pipe for carbon source supplementation, 3 is the branch pipe for carbon source supplementation, 4 is the wetland plant, and 5 is the matrix.

[0048] The constructed wetland system is located in a certain area of ​​Huizhou City, with a utilization and treatment scale of 500 m 3 / d's combined constructed wetland is used for advanced treatment of the tail water of the low-carbon and high-nitrogen sewage treatment plant. The processing steps are as follows:

[0049] S1. Soaking the plant material in the soaking solution and hydrolyzing it to obtain a hydrolyzed solution;

[0050] S2. Adding the hydrolyzate obtained in S1 to the constructed wetland;

[0051] S3. The hydrolyzate added to the...

Embodiment 2

[0059] This embodiment provides a system for denitrifying low-carbon and high-nitrogen sewage by utilizing plant carbon sources to strengthen constructed wetlands, the main structure of which is the same as that of Embodiment 1.

[0060] The constructed wetland system is located in a certain area of ​​Huizhou City, with a utilization and treatment scale of 500 m 3 / d's combined constructed wetland is used for advanced treatment of urban river sewage with low carbon, high nitrogen and high concentration of ammonia nitrogen. The processing steps are as follows:

[0061] S1. Soaking the plant material in the soaking solution and hydrolyzing it to obtain a hydrolyzed solution;

[0062] S2. Adding the hydrolyzate obtained in S1 to the constructed wetland;

[0063] S3. The hydrolyzate added to the constructed wetland decomposes to release low-molecular-weight organic matter that can be used by denitrifying bacteria, and strengthens the denitrification of low-carbon and high-nitrog...

Embodiment 3

[0071] Others are the same as Example 2, except that the solid-to-liquid ratio is 1:30.

[0072]The operation mode of the constructed wetland adopts intermittent water intake, and the water intake pipes are evenly distributed on the surface of the constructed wetland, and the water intake is 12 hours, and the interval is 12 hours. Hydraulic load according to 1.0 m 3 / (m 2 d) run.

[0073] The concentration of CODcr in the influent is about 20 mg / L. After supplementing the hydrolyzate, the concentration of CODcr in the influent can reach 65.5 mg / L, the concentration of TN is 10.2-14.8 mg / L, and the concentration of NO 3 - -N2.9~9.2 mg / L, NH 4 + -N 3~8.1 mg / L.

[0074] The experimental results show that at this time, the flow rate of the hydrolyzate is controlled according to Example 2, and the plant hydrolyzate is added to adjust the C / N to only about 6. When the hydraulic load is 1.0 m / d, all indicators can achieve a good removal effect: TN The removal rate can be as hi...

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Abstract

The invention discloses a method and a system for denitrifying low-carbon high-nitrogen sewage by utilizing a plant carbon source-enhanced artificial wetland. The method comprises the following steps: hydrolyzing by taking waste crops or wetland plant straws as carbon sources, and charging hydrolysate into an artificial wetland so as to improve the denitrification efficiency of the low-carbon high-nitrogen sewage. The invention simultaneously provides a treatment system, which is simple in structure, and scientific and reasonable in carbon source charging mode, and the denitrification effect of the low-carbon high-nitrogen sewage can be well realized by enhancing the artificial wetland through utilizing the plant carbon source. According to the method, the adopted plant carbon sources are cheap and easily available, the carbon release capability is strong, the bio-denitrification effect is good, and the hydrolysate is simple and practical to prepare, the carbon source charging mode is strong in continuous running capability, and the method is simple to maintain, less in secondary pollution, low in production cost, and capable of solving the technical difficulty of treating tail water in a sewage treatment plant with low carbon nitrogen ratio through artificial wetland by utilizing a simple method.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method and system for denitrifying low-carbon and high-nitrogen sewage by using plant carbon sources to strengthen artificial wetlands, and is suitable for improving the denitrification efficiency of low-carbon and high-nitrogen polluted water bodies. Background technique [0002] At present, most of the sewage treatment plants implement the second-level or first-level B discharge standards in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants". This will also greatly increase the technical difficulty and cost of sewage treatment. The tail water of the existing sewage treatment plants in my country, especially the sewage treatment plants in southern cities, is highly nitrified and has insufficient carbon sources, and the C / N ratio is low, making it difficult to further denitrify treatment. Direct discharge of low-carbon and high-nitrogen polluted wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/28
CPCY02W10/10
Inventor 杨扬钟胜强陶然乔永民张敏
Owner JINAN UNIVERSITY
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