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Method for reducing biological slime in circulating water system

A technology of circulating water system and biological slime, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. The amount of mud produced and the heat exchange efficiency of the heat exchanger are reduced, so as to reduce the dosage of chemicals, reduce corrosion and perforation, and increase the concentration ratio.

Active Publication Date: 2013-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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 reducing biological slime in circulating water system

Examples

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Embodiment 1

[0024] The circulating water volume of a circulating water plant is 20,000 tons / hour, the COD (chromium method, the same below) of the circulating water influent is 35.2~69mg / L, and the ammonia nitrogen is 2.0~8.9mg / L. Adopt the method of the present invention, first take a certain amount of activated sludge, add denitrification and denitrification bacteria agent to the sludge according to the volume ratio of 0.05% of the sludge, fully mix the sludge and the bacteria, and then according to the volume ratio of 1000mg / L The dosage is added to the reactor, and the circulating water volume of 2000 tons / hour enters the biological aerated filter (BAF). The operating conditions of the biological aerated filter are: temperature 25 ° C, pH 7.6, DO: 1.8 mg / L. After stable operation, the ammonia nitrogen and COD in the effluent are always lower than 5mg / L, and the purification treatment of conventional pollutants in the circulating water is completed. After long-term use, the water qual...

Embodiment 2

[0026] 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 50.2~79mg / L, and the ammonia nitrogen is 5.2 ~14.9mg / L. The aeration raw filter is used to partially treat the circulating cooling water behind the cooling tower. First, a certain amount of activated sludge is taken, and denitrification and denitrification bacteria are added to the sludge according to the sludge volume ratio of 0.08%. Fully mix with the bacteria, then add it into the reactor according to the dosage of 1500mg / L, and enter the biological aerated filter (BAF) with 15% of the circulating water volume. The operating conditions of the biological aerated filter are: temperature 32°C, pH7.8, DO: 2.5mg / L. After stable operation, the ammonia nitrogen in the effluent water is lower than 5mg / L, and ...

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Abstract

The invention relates to a method for reducing biological slime in a circulating water system. The method comprises the following steps: placing a biodegradable reactor in the circulating water system, feeding at least part of circulating water into the biodegradable reactor to perform biochemical treatment, and feeding effluent of the biodegradable reactor into the circulating water system, wherein heterotrophically nitrified and aerobically denitrified bactericide in the biodegradable reactor as inoculums, and the heterotrophically nitrified and aerobically denitrified bactericide comprises Arthrobactercreatinolyticus FDN-1, Flavobacteriummizutaii FDN-2, Paracoccusdenitrificans DN-3 and Methylobacteriumphyllosphaerae SDN-3. According to the method provided by the invention, the production of biological slime in the circulating water system can be effectively reduced, the heat exchange efficiency of the water circulating system is improved, the corrosion is reduced, and the operation stability of the circulating water treatment system is improved.

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 高会杰孙丹凤韩建华
Owner CHINA PETROLEUM & CHEM CORP