The role of coarse bubble diffusers for aeration tanks in improving water quality

Coarse bubble diffusers for aeration tanks have many important functions in improving water quality:
Increasing dissolved oxygen content:
Guarantee of oxygen supply: Coarse bubble diffusers can disperse air into bubbles and introduce them into the aeration tank, increase the contact area between air and water, and promote the rapid dissolution of oxygen in the air into the water, providing sufficient oxygen for aerobic microorganisms to maintain their normal metabolism and growth and reproduction. This is crucial for the biochemical reaction, because aerobic microorganisms need a lot of oxygen in the process of decomposing organic pollutants. For example, when treating domestic sewage, sufficient dissolved oxygen can enable microorganisms to efficiently convert organic matter in sewage into carbon dioxide, water and harmless substances, thereby reducing the chemical oxygen demand (COD) and biochemical oxygen demand (BOD) of sewage.

Preventing hypoxic environment: Adequate oxygen supply can avoid local hypoxia or anaerobic conditions in the aeration tank. Under hypoxic or anaerobic conditions, some harmful substances such as hydrogen sulfide and methane may be produced, and the sedimentation performance of sludge will deteriorate, filamentous bacteria will multiply in large numbers, and other problems will affect the sewage treatment effect and the stable operation of the system. The continuous aeration of the coarse bubble diffuser can maintain a good aerobic environment in the aeration tank and inhibit the occurrence of these adverse phenomena.

Enhance the mixing and stirring effect:
Uniform distribution: The coarse bubbles will produce a certain hydraulic stirring effect during the rising process, so that the sewage and sludge in the aeration tank are fully mixed to avoid the situation where the local concentration is too high or too low. This helps to increase the contact opportunity between microorganisms and pollutants, so that microorganisms can degrade pollutants more evenly and improve treatment efficiency. For example, in some large aeration tanks, if there is no good mixing and stirring, pollutants in some areas may not be effectively treated, and the role of the coarse bubble diffuser can effectively improve this situation.

Promote material transfer: Mixing and stirring can also speed up the transfer of nutrients, metabolites and other substances between the water phase and the microbial phase. Microorganisms need to continuously obtain nutrients to maintain growth and metabolism, and at the same time excrete metabolites from the body. The good mixing conditions brought by the coarse bubble diffuser are conducive to the transfer of these substances, ensure the normal physiological activities of microorganisms, and thus improve the water quality treatment effect.

Improve sludge activity:
Stimulate microorganisms: The disturbance of bubbles and the supply of oxygen can stimulate the activity of microorganisms and keep them at a high metabolic level. Microorganisms with higher activity can decompose organic pollutants more quickly and improve water quality more significantly. Moreover, good sludge activity helps to form sludge flocs with tight structure and good sedimentation performance, which is beneficial to the subsequent mud-water separation and sludge treatment.

Prevent sludge siltation: The rising power of coarse bubbles can prevent sludge from silting at the bottom of the aeration tank and keep the sludge suspended. If sludge is silted, it will not only affect the aeration effect, but also lead to the generation of local anaerobic environment, causing sludge swelling and other problems. Through the action of coarse bubble diffuser, the sludge can be evenly distributed in the aeration tank, improving the operating stability of the entire system.

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