The industrial cooling water system, as the core hub of circulating water, provides a warm, oxygen rich, and nutrient rich environment for algae growth. The excessive proliferation of algae such as blue-green algae and green algae not only blocks pipelines and reduces heat transfer efficiency, but also causes chain problems such as equipment corrosion and water quality deterioration.Cooling water algae suppressantAs a targeted governance measure, its core role is to accurately inhibit the growth of various common algae and ensure the stable operation of the circulating water system. It is crucial for industrial water treatment to clarify the types of algae it inhibits and their mechanisms of action.

Cyanobacteria is one of the destructive algae in cooling water systems and is also a key target of algae suppressants. Although these prokaryotes are called "algae", they possess certain characteristics of bacteria. Common species include Microcystis, Tremella, and Anabaena. Cyanobacteria are prone to erupt during high temperature seasons, forming sticky blue-green flocs that adhere to the walls of heat exchange tubes and form biofilms. The algal toxins secreted not only pollute water quality, but also exacerbate pitting corrosion of carbon steel pipelines. Algae suppressants work by disrupting the photosynthetic system or cell membrane structure of blue-green algae, such as quaternary ammonium salt algae suppressants that can penetrate their cell walls and interfere with cell metabolism; Copper agents can inhibit the activity of phycocyanin, preventing it from undergoing photosynthesis and leading to its death.

Green algae are widely distributed algae in cooling water systems, with a wide variety of species, such as Chlorella, Scenedesmus, and Chlamydomonas. Green algae cells contain chlorophyll and are bright green in color. They often exist in single-cell or collective form and reproduce rapidly. They are prone to form green floating debris on the water surface or adhere to equipment surfaces. Compared to blue-green algae, green algae have a more complex cell wall structure but are more adaptable to environmental changes. Algae suppressants have different mechanisms of inhibition against green algae: organotin based agents can inhibit the formation of spindles during cell division and block the reproductive process; Isothiazolinone achieves rapid algal killing by disrupting its intracellular enzyme system, leading to protein denaturation. The biofilm formed by green algae is relatively loose, and an appropriate amount of algae suppressant can effectively strip and inhibit its regeneration.

In addition to the two mainstream categories of blue-green algae and green algae, algae suppressants also need to address the threat of other common algae such as diatoms and dinoflagellates. Diatoms are characterized by siliceous cell walls, and common diatoms such as dinoflagellates and dinoflagellates are prone to adhere to the condenser tube walls, forming hard diatomaceous earth deposits that significantly reduce heat transfer efficiency. Regarding diatoms, algicidal agents often exert their effects by inhibiting the synthesis of their siliceous shells, such as organic amine agents that can interfere with the absorption and conversion of silicic acid. Although the frequency of dinoflagellates in cooling water systems is lower than the first two types, once they break out, the harm is extremely great. Representative species such as naked dinoflagellates and Alexandrium will produce viscous secretions, causing the water to emit odor. Some dinoflagellates also have phototaxis and are prone to gather in the transparent parts of the system. Algae suppressants can effectively control their population size by disrupting their motor organs or inhibiting respiratory enzyme activity.

It is worth noting that the role of algae suppressants is not a one size fits all approach, but requires precise selection based on the structure of algal communities. The sensitivity of different algae to pesticides varies significantly, for example, blue-green algae have a higher tolerance to copper pesticides, while green algae are more sensitive to quaternary ammonium salts. Therefore, in practical applications, it is necessary to first determine the dominant algal species through water quality testing, and then match the corresponding type and dosage of algae suppressants. At the same time, algae suppressants also need to consider compatibility with corrosion inhibitors and scale inhibitors to avoid secondary pollution or reduced efficacy.

From industrial cooling towers to central air conditioning circulating water systems, the growth of algae such as blue-green algae and green algae is always a hidden danger. Cooling water algae suppressants target the physiological weaknesses of various algae, inhibiting their reproduction from the source and providing a "protective shield" for the circulating water system. With the increasing demand for environmental protection, efficient, low toxicity, and biodegradable new algae suppressants continue to emerge, which can accurately inhibit harmful algae and reduce the impact on the ecological environment, providing strong support for the green development of industrial water treatment.