A large amount of foam is likely to appear in the aeration stage of the oxidation ditch. If there are many bubbles in the oxidation ditch, if it is not treated in time, it will cause negative effects, increase the difficulty of treatment, and affect the normal operation of the sewage treatment system. So, how to deal with oxidation ditch foam? Adding aeration tank defoamer is a good solution. This article analyzes the causes and hazards of oxidation ditch foaming, and gives a professional oxidation ditch defoaming solution.
Causes of blistering in oxidation ditch
1. Foaming caused by sludge: the sludge age is too long, the sludge is aging, and it is easy to produce foam;
2. Water quality components cause foaming: Due to the large amount of grease in the influent water, the treatment system cannot completely remove it effectively. Part of the grease is enriched in the sludge, and a large amount of foam is generated after the brush is oxygenated and stirred;
3. Surfactant causes foam: When the wastewater contains more surface active substances, a lot of white foam is prone to appear.
4. Abnormal growth of microbes: Excessive growth of filamentous bacteria will lead to the formation of stable and difficult-to-remove scum bubbles on the water surface due to the formation of a large amount of air in the micelles. Excessive growth of filamentous bacteria has now been proved to be the main reason for the formation of foam.
(Picture: Water treatment in aeration tank)
The hazards of blistering in the oxidation ditch
1. Too much foam affects the effluent, and the water quality is not good enough, which slows down the production process;
2. A large amount of foam in the aeration stage affects the normal progress of water treatment, and the overflow of a large amount of foam will pollute the environment;
3. A large number of bubbles in the aeration tank will affect the transfer of oxygen, reduce the oxygenation efficiency of the equipment, and affect the growth of microorganisms.
Thick foam scum floats on the surface of the oxidation ditch, reducing the area and time of the mixed liquid contacting air. Although the liquid level is constantly updated, the oxygen content in the mixed liquid has not increased, while the metabolism of biological bacteria is increasing. Continuously consuming oxygen, so the dissolved oxygen DO in the mixed solution will continue to decrease along the process, which will change the proportion of bacteria in the activated sludge-aerobic bacteria will decrease, filamentous bacteria will increase, and foam will be generated and deteriorated. The living environment of aerobic bacteria reduces the ability of aerobic bacteria to digest and absorb pollutants in wastewater and affect the quality of effluent.
Oxidation ditch for defoaming solutions
The bubbling of the oxidation ditch may be related to the water quality of the influent, or it may be caused by improper treatment process that the foam scum in the aeration tank of the oxidation ditch is not treated in time, and it will collect more and more in the aeration tank, which is very unfavorable for sewage treatment . In the case of oxidation ditch treatment foam, the foam can be treated by timely adjustment of the process and adding defoamers.
The use of defoamers to defoam is very common in sewage treatment. Generally, the amount of defoamers is small and it is very convenient to use. However, the defoamer has a certain pertinence. If you encounter a problem with sewage treatment foam, you must find a professional manufacturer to solve the problem.
The Nanhui defoamer manufacturer has developed and designed the oxidation ditch aeration tank defoamer according to the characteristics of easy foaming in the oxidation ditch treatment process. It is a compound defoaming agent that can eliminate physical, chemical and biological causes. Large and small foam, can be used in various water quality, defoaming efficiency is very good.
(Picture: Defoamer for aeration tank)
Advantages of Nanhui oxidation ditch aeration tank defoamer
1. Free samples
The source of the defoamer is sold directly from the factory, with rich industry application experience and a wide range of formulas. Professional and technical personnel can answer one-on-one, and recommend samples according to your foaming situation;
2. Exclusive customization
The manufacturer is strong in research and development, and can customize the defoaming formula according to your defoaming requirements with high defoaming efficiency;
3. Stable performance
Stable defoaming and foam suppression, fast defoaming, long foam suppression time, acid and alkali resistance and high temperature environment, and can continue defoaming in various environments.
4. Does not affect the process
It is chemically inert, will not react with other water treatment additives, does not affect the water treatment process, has good application effects, many cases, and high customer reviews.
