Hello: What causes green algae to appear on the surface of the aerobic tank? How to solve it.

An excess of nutrients such as nitrogen and phosphorus required by organisms can lead to rapid proliferation of algae and other plankton, a decrease in dissolved oxygen levels in the water, deterioration of water quality, and massive death of aerobic microorganisms and aquatic indicator insects. Suggestions: 1. Reduce the nitrogen and phosphorus concentrations in the aerobic tank, thereby lowering its treatment load. It is also possible to dilute the concentration of the treated water as much as possible. For newly built aerobic tanks, the treatment load should be increased gradually, giving the aerobic microorganisms time to adapt; enough populations should first be developed before increasing the treatment load ； 2. Excavating bottom sediment, carrying out deep aeration of the water body, adding water to dilute it, and laying plastic on the surface of the sediment. 3. Methods such as coagulation sedimentation and the use of chemical agents to kill algae; for example, there are many types of cations that can react with phosphates to form insoluble precipitates which then settle. 4. There is also (not necessarily applicable to every system) the method of using aquatic organisms to absorb nitrogen and phosphorus for metabolic activities, thereby removing these nutrients from the water body. (Water hyacinth)

The main reason for the appearance of green algae in the aerobic tank is the high concentration of nitrogen and phosphorus in the water, as well as low dissolved oxygen levels in the tank. Suggestions: 1. If the nitrogen and phosphorus levels in the effluent meet the standards, no action is needed regarding these substances; if they do not meet the standards, adjustments should be made according to the actual situation, either by reducing the nitrogen and phosphorus content in the incoming water or by enhancing the treatment facilities ； 2. Increase the dissolved oxygen in the aerobic tank to ensure that the DO of the effluent remains around 2.

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