TREATMENT OF DIRTY FOAM AND TURBID WATER

Running a fan or running bottom oxygen in shrimp farming is a condition for forming a foam film on the surface of the pond. In the presence of clean, not-viscous water with no suspended matter, the foam film will quickly dissolve. In the case of long-lasting foam film, forming a long trail behind the fan or gathering in the corner of the pond to form a dirty foam, it is because the water has a viscosity and the culture water environment is deteriorating, affecting the growth and development of shrimp and, more seriously, can cause damage to farmed shrimp.

Reason

• Algae bloom: under favorable conditions (excess organic matter, imbalance of nutrients Nitrogen and Phosphorus), toxic algae such as blue-green algae, thyroid algae, eye algae, and red algae … thrive, algae bloom, will produce many toxic substances that cause viscous pond water, creating scum that is difficult to dissolve.
• Algae death (algae collapse): if the water pH is unstable, the alkalinity is low, or the algae are not killed properly, it will cause the algae to die simultaneously, polluting the pond water, and creating scum that is difficult to dissolve.
• In the process of anaerobic decomposition, the organic sludge layer from the bottom of the pond has produced toxic gases such as H₂S, CH₄, NH₃, and NO₂ … The gas produced will combine the amount of dissolved oxygen in the water. to be converted to a less toxic form and will be rapidly released from the environment. When the amount of organic waste accumulates on the pond’s bottom, the anaerobic decomposition process occurs strongly, and toxic gas will increase and form scum in the pond. Pond water with high pH and high temperature potentially toxic to crayfish increases.
• Growth of filamentous microorganisms when a nutritional imbalance occurs. These microorganisms are capable of producing hydrophobic compounds that bind to air bubbles to create scum, and when they die, these microorganisms will release biological surfactants that cause water viscosity, and foam formation increases.
• Suspended solids make water viscous, turbid, and lumpy, leading to the formation of scum, which has 2 main causes:
  • Natural causes
    • The soil on the pond bank is washed away in the rainy season
    • Non-agglomerated suspended clay colloidal particles (inorganic)
    • The strong activity of aquatic animals and microorganisms can also make pond water cloudy, especially in high-density ponds.
  • Human causes
    • Use low-quality lime, and many impurities to reduce acidity, and increase alkalinity
    • Shallow ponds or not dredging the ponds carefully also make the water cloudy
    • The amount of excess food and shrimp waste is much but not treated

Harm

• These are favorable conditions for the transmission of diseases to shrimp
• Shrimp lack oxygen to breathe
• Shrimp eat poorly, eat less and stop eating
• Shrimp are stunted, slow to grow, susceptible to diseases, and reduce productivity
• In turbid water conditions, shrimp eat less, limit the growth of beneficial algae, reduce dissolved oxygen, and hinder respiration.

How to thoroughly handle dirty foam, turbid water, and pigs

• Stabilize algae density in ponds by maintaining stable pH and alkalinity parameters.
• Strictly manage the feeding, and reduce the amount of excess food.
• Remove the bottom sludge from the pond by changing the water, siphoning, and siphoning the bottom of the pond.
• Thorough reinforcement of pond banks, ponds must have suitable depth.
• In the case of turbid water, it is necessary to determine whether the water is organic or inorganic to have a suitable treatment, by taking an appropriate amount of water into a bucket or aquarium, and letting it rest for 1 week, if the water is still cloudy then is due to suspended clay particles, if there is a layer of sediment at the bottom, the cause is organic matter
• Using probiotics: Microbiological products: Bacillus strains of beneficial bacteria are capable of decomposing bottom sludge and excess organic matter in water.

PROPOSED SOLUTION FROM THAI NAM VIET

The phenomenon of scum greatly affects the crop, so it is necessary to promptly handle and control the factors that cause this phenomenon. Concentrated Enzyme products with strong activity will treat scum as well as an excess organic matter after only 12 hours of use, the addition of microbial products will then maintain effective water quality control throughout the process. farming, helping to save time, and costs and improve productivity.