Method for precisely controlling dosage of external carbon source in biological denitrification of sewage

A technology of biological sewage and external carbon source, which is applied in water pollutants, chemical instruments and methods, biological water/sewage treatment, etc. The effect of solving the effluent COD exceeding the standard and the waste of chemicals, reducing the risk of effluent COD exceeding the standard, and high application and promotion value

Inactive Publication Date: 2019-01-04
NANJING UNIV OF INFORMATION SCI & TECH
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  • Claims
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Problems solved by technology

[0006] Aiming at the problem that the dosage of external carbon source cannot be accurately controlled in the current biological denitrification process of sewage treatment plants, resulti

Method used

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  • Method for precisely controlling dosage of external carbon source in biological denitrification of sewage
  • Method for precisely controlling dosage of external carbon source in biological denitrification of sewage
  • Method for precisely controlling dosage of external carbon source in biological denitrification of sewage

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Example Embodiment

[0030] Example 1:

[0031] A method for accurately controlling the external carbon source in the biological denitrification process is applied to the pre-denitrification (A / O) biological treatment process of a municipal sewage treatment plant that uses methanol as the external carbon source.

[0032] (1) Determine the denitrification potential of the external carbon source-methanol. Using batch experiments, take an appropriate amount of activated sludge in the anoxic denitrification tank and wash it with 0.85% saline three times to make the supernatant after the sludge sedimentation free of nitrogen and organic matter (COD); place it in a 500 mL container Stopper the Erlenmeyer flask, add 45.54 mg NaNO 3 And 50 mg of methanol, and a microbial nutrient solution that does not contain organic carbon and nitrogen, and dilute to 500 mL with pure water, adjust the pH to 7.4, and make the denitrification sludge concentration in the Erlenmeyer flask 2500 mg / L, nitrate nitrogen (NO 3 - -N...

Example Embodiment

[0049] Implementation case 2:

[0050] A method for accurately controlling the addition of carbon sources in the biological denitrification process, applied to a certain A 2 / O process sewage treatment plant.

[0051] (1) Determine the denitrification potential of the external carbon source-methanol. Using batch experiments, take an appropriate amount of activated sludge in the anoxic denitrification tank and wash it with 0.85% saline three times to make the supernatant after the sludge sedimentation free of nitrogen and organic matter (COD); place it in a 500 mL container Stopper the Erlenmeyer flask, add 45.54 mg NaNO 3 And 50 mg of methanol, and a microbial nutrient solution that does not contain organic carbon and nitrogen elements, and dilute to 500 mL with pure water, adjust the pH to 7.3, and make the denitrification sludge concentration in the flask after the constant volume is 2500 mg / L, nitrate nitrogen (NO 3 - -N) Concentration is 15 mg / L, methanol concentration is 100...

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Abstract

The invention discloses a method for precisely controlling the dosage of an external carbon source in biological denitrification of sewage. The method comprises the steps as follows: (1) measuring denitrification potential of the external carbon source; (2) measuring concentration of NO3<->-N, NO2<->-N, total nitrogen and COD in to-be-treated sewage; (3) measuring the denitrification potential ofto-be-treated sewage; (4) calculating the total nitrogen content and COD content of to-be-treated sewage in unit volume, calculating the mass of N removed through denitrification reduction from organic matter contained in to-be-treated sewage in unit volume theoretically according to the denitrification potential of to-be-treated sewage, comparing the mass with the total nitrogen content to judgewhether the external carbon source is required, and calculating the dosage of the external carbon source added to the to-be-treated sewage in unit volume according to the denitrification potential ofthe external carbon source. By means of the method, the dosage of the external carbon source required for complete denitrification can be precisely calculated according to the water quality and watervolume conditions of the to-be-treated sewage.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in environmental protection, and in particular relates to a method for accurately controlling the dosage of additional carbon sources for biological denitrification of sewage. Background technique [0002] Water resources are the lifeblood of sustainable development of human society. However, since the beginning of the 21st century, with the rapid development of economy and urbanization, the amount of water and sewage discharge has increased sharply, which has caused the shortage of fresh water resources and the pollution of water environment in my country. The eutrophication of water body caused by excessive discharge of elements is particularly prominent. The eutrophication of the water body promotes the excessive growth of algae in the water body, which makes the drinking water produce peculiar smell, and reduces the transparency of the water body, so that the dissolved oxygen in the w...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F3/30C02F101/16
CPCC02F3/28C02F3/302C02F2101/16C02F2101/163
Inventor 方华杨飙赵怡李吴波曹惠忠
Owner NANJING UNIV OF INFORMATION SCI & TECH
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