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Method for biologically purifying industrial circulating water

A technology for industrial circulating water and biological purification, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the blockage of water holes and grilles in cold water towers, and reduce biological slime The production volume and the heat transfer efficiency of the heat exchanger are reduced, so as to achieve the effect of reducing the dosage of chemicals, reducing corrosion and perforation, and increasing the concentration multiple

Active Publication Date: 2013-10-30
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

This method can degrade the biochemical substances in the circulating water and then return the circulating water to the device area. It can control the growth and reproduction of microorganisms by limiting the substrate concentration, thereby reducing the production of biological slime, and truly solving the problem of biological problems in the circulating water system. Breeding, slime deposits lead to a decrease in the heat transfer efficiency of the heat exchanger, corrosion of equipment, blockage of cooling water tower cloth holes and grilles, etc.

Method used

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  • Method for biologically purifying industrial circulating water

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Effect test

Embodiment 1

[0034] The preparation method of embodiment 1 denitrifying bacteria agent

[0035] 1. Bacterial activation: The formula of the activating medium of Cochlear palustris FSDN-A is: beef extract: 8g / L, peptone: 12g / L, NaNO 2 : 0.5g / L, KNO 3 : 0.5g / L; the activation medium formula of Arthrobacter FDN-1 and Flavobacterium waterii FDN-2 is: beef extract: 5g / L, peptone: 10g / L, NaNO 2 : 1g / L, add 2.0% agar. Spread evenly on the plate and place it in a constant temperature incubator at 30°C for activation.

[0036] 2. Use the inoculation loop to scrape the bacteria on the plate and inoculate them in the corresponding liquid culture solution respectively, and culture them with shaking under aerobic conditions of 25~35℃ and 150~240rpm for 1~3 days until the logarithmic growth phase, and obtain Liquid bacterial agent seed solution; the formula of the medium is the same as that of the activated medium, without adding agar.

[0037] 3. The above-mentioned Kokia palustris FSDN-A was used ...

Embodiment 2

[0040] The circulating water volume of a circulating water plant is 29,000 tons / hour, the COD (chromium method, the same below) of the circulating water influent is 30.2~65mg / L, and the ammonia nitrogen is 2.4~7.9mg / L. Among them, 900 tons / hour of circulating water enters the biological aerated filter (BAF). The operating conditions of the biological aerated filter are: temperature 28°C, pH 7.5, DO 1.5mg / L. First, mix the denitrifying and denitrifying bacteria agent A with the activated sludge at a ratio of 1:15 according to the MLSS, and then add it to the biological aerated filter according to the dosage of 1000mg / L of the MLSS. After 20 days, biofilm can be seen to form. At this time, nitrifying bacteria are added according to the dosage of 100mg / L of MLSS. After treatment, ammonia nitrogen and COD in the effluent are always lower than 5mg / L, and the concentration ratio of circulating water is increased from the original 4.5. Up to 5.8, the water quality of the circulating ...

Embodiment 3

[0042] In the circulating cooling water system of a large domestic petrochemical refinery, the total amount of circulating water is 25,000 tons / hour, the control cycle concentration ratio is 2.7, the supplementary water volume is 600 tons / hour, the COD of circulating water is 60.2~79mg / L, and the ammonia nitrogen is 7.2 ~12.9mg / L. The aeration raw filter is used to partially treat the circulating cooling water behind the cooling tower, and the treated circulating water is 1100 tons / hour. First mix denitrifying agent B and activated sludge according to the ratio of MLSS of 1:20, and then add it to the biological aerated filter according to the dosage of 1500mg / L after mixing. Membrane formation, start to add nitrifying bacteria according to the dosage of 80mg / L of MLSS. The operating conditions of the biological aerated filter are: temperature: 32°C, pH: 7.8, DO: 2.0mg / L. After treatment, the ammonia nitrogen in the effluent water is lower than 5mg / L, and the COD is always lo...

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Abstract

The invention relates to a method for biologically purifying industrial circulating water. The method is characterized in that a biodegradation reactor is arranged in a circulating water system; nitrobacteria and denitrifiers are taken as inocula in the biodegradation reactor; at least part of the circulating water enters the biodegradation reactor to be biologically treated; the water from the biodegradation reactor enters the circulating water system; and the denitrifiers contain one or two of kocuriapalustris FSDN-A, arthrobactercreatinolyticus FDN-1 and flavobacteriummizutaii FDN-2. Compared with the prior art, the method has the advantages that the biological treatment method is adopted to treat the nutrient sources needed by microorganisms before the circulating water enters the device, so that the microorganisms brought in by the circulating water in the circulating process are difficult to survive, and then growth and reproduction of the microorganisms in the circulating water system are controlled.

Description

technical field [0001] The invention relates to a method for biological purification of industrial circulating water, in particular to a method for controlling the growth of microorganisms in a circulating water system and preventing the production of biological slime. Background technique [0002] The industrial circulating water system is a large water user. The circulating water is mainly used as a cooling medium and is responsible for exchanging heat for the heated material. The temperature of this part of the water is low when it enters the device, and the temperature is high when it is circulated back from the device. Therefore, it needs to be recycled when it is reused. The cooling tower of the water plant (generally there is filler in the tower) for cooling treatment. Most of the cooling towers adopt an open structure. The bottom of the tower is vented with air, and the water flows from top to bottom. In the cooling tower, the contact between water and air can reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34
Inventor 高会杰张鹏刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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