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Denitrification treatment method for organic wastewater

A technology of organic wastewater and treatment methods, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as low total nitrogen removal efficiency, and reduce equipment footprint. , the effect of reducing operating costs

Inactive Publication Date: 2018-06-19
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this treatment method has low removal efficiency for total nitrogen (TN)

Method used

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  • Denitrification treatment method for organic wastewater
  • Denitrification treatment method for organic wastewater
  • Denitrification treatment method for organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Integrated denitrification reactor such as figure 2 As shown, it includes an outlet weir 1, a ceramsite layer 2, a cobblestone layer 3, a water distributor 4, an intermittent air inlet pipeline 5, an intermittent water inlet pipeline 6, and a reaction chamber 7.

[0084] The reaction chamber 7 is made of plexiglass, cylindrical in appearance, with a height of 1.25m and a diameter of 0.1m. There is 5L ceramsite filter material inside. The ceramsite diameter is 3-5mm and the density is 1.75g / cm 3 , with a specific surface area of ​​about 4m 2 / g.

[0085] (1) Biofilm treatment stage:

[0086] Soak the ceramsite in the reaction chamber with a starch aqueous solution with a COD value of 300mg / L, and continuously feed air into the reaction chamber, and the intake rate of the air is 30L / min;

[0087] After 24 hours, the COD value of the aqueous sugar solution soaked in ceramsite was determined to be 250mg / L;

[0088] Remove the aqueous carbohydrate solution in the reacti...

Embodiment 2

[0105] (1) biofilm processing stage, same as embodiment 1;

[0106] (2) Denitrification stage:

[0107] The organic waste water produced in the production process of the thin film transistor liquid crystal display with a carbon-to-nitrogen ratio of 4:1 is passed into the reaction chamber after the biofilm treatment, and after 0.5 hours,

[0108] After stopping the introduction of the organic waste water to be treated, aerate the reaction chamber;

[0109] After aeration for 0.5 hours, stop the aeration and continue to feed the organic wastewater;

[0110] The process of feeding organic wastewater and aeration is carried out alternately; the process of feeding organic wastewater and aeration is performed once, and the air-water ratio is 4:1.

[0111] Maintain the hydraulic retention time of the organic wastewater to be treated at 8 hours, and run for 4 to 7 days.

[0112] The organic waste water produced in the production process of the thin-film transistor liquid crystal di...

Embodiment 3

[0129] (1) biofilm processing stage, same as embodiment 1;

[0130] (2) Denitrification stage:

[0131] The organic waste water produced in the production process of the thin-film transistor liquid crystal display with a carbon-to-nitrogen ratio of 4:1 is passed into the reaction chamber after the biofilm treatment, and after 1 hour,

[0132] After stopping the introduction of the organic waste water to be treated, aerate the reaction chamber;

[0133] After 1 hour of aeration, stop the aeration and continue to introduce organic wastewater;

[0134] The process of feeding organic wastewater and aeration is carried out alternately; the process of feeding organic wastewater and aeration is performed once, and the air-water ratio is 4:1.

[0135] The hydraulic retention time (HRT) of the organic wastewater to be treated is maintained at 8 hours, and the operation days are 5 days.

[0136] The organic waste water produced in the production process of the thin-film transistor li...

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Abstract

The invention relates to the field of sewage treatment, and in particular relates to a denitrification treatment method for organic wastewater. The denitrification treatment method is as follows: StepS1, performing biofilm colonization on a reaction chamber filled with ceramsites having a diameter of 3 to 5 mm and a specific surface area of 3 to 5 m<2> / g; step S2, introducing organic wastewater to be treated into the reaction chamber after the biofilm colonization, wherein the organic wastewater to be treated is organic wastewater generated during the production process of thin film transistor liquid crystal displays; and step S3, after preset time is reached, stopping introduction of the organic wastewater to be treated, and performing aeration in the reaction chamber; repeatedly performing the steps S2 and S3; and keeping the hydraulic retention time of the organic wastewater to be treated at 8 to 10 hours to complete denitrification treatment. According to the method, the nitrification treatment under aerobic conditions and the denitrification treatment under anaerobic conditions are carried out efficiently, and the removal rates of ammonia nitrogen and total nitrogen in the treated water can reach 80% or more.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a denitrification treatment method for organic wastewater. Background technique [0002] With the development of liquid crystal flat panel display technology, thin film transistor liquid crystal display (TFT-LCD) is currently the most mainstream display on the market and has been fully popularized. [0003] In the production process of thin film transistor liquid crystal display (TFT-LCD), many processes involved need to use a large amount of nitrogen-containing chemicals, for example, a large amount of TMAH (tetramethylammonium hydroxide) is used for the corrosion and development of the panel, resulting in the discharge of organic Wastewater contains a large amount of organic nitrogen. In order to avoid environmental pollution, the organic wastewater generated in the production process of TFT-LCD must be treated before being discharged. [0004] At present, the common treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/38
CPCC02F3/302C02F2101/38
Inventor 田兆龙郭宇彬杨祖博徐童洋杨程
Owner BOE TECH GRP CO LTD
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