Glutaraldehyde, also known as protectol, cidex ... along with many other names, this is a widely used as a disinfectant in health and many other fields. In addition, this substance is also widely used in medicine. Glutaraldehyde has a chemical formula of C5H8O2, the temperature of this substance is the same as water, 100 ° C, however for glutaraldehyde to decompose, the boiling point needs to be 187–189 ° C. This substance freezes at –13.8 ° C.

Uses of glutaraldehyde:

Glutaraldehyde (also known as glutaraldehyde bactericidal chemical c5h8o2) is a broad-spectrum bactericide capable of killing cells very quickly, glutaraldehyde on the market today often has a concentration of 40-50%. This substance is used to disinfect flounder eggs at doses of 400 - 800 mg / l for 5 minutes and is highly effective in increasing hatching and survival rates of larval fish.

According to EU and US Environmental Protection Agency (USEPA). Normal bactericidal glutaraldehyde solution is not a poison. Not belonging to a group of chemicals that can cause cancer. Moreover, glutaraldehyde has very environmentally friendly characteristics and is considered to have no negative effects on the environment thanks to its 95% biodegradability so it will not cause bioaccumulation. study in the body of aquatic animal species.

Therefore, glutaraldehyde is superior to other types of disinfectants. Because there is no residual, it is still effective to treat when the water environment has a low temperature. Moreover, it is less likely to be absorbed into the bottom mud, causing toxic accumulation for shrimp and fish.

Uses :

In fact, a 0.1-2% glutaraldehyde bactericidal chemical solution of 0.1-2% is commonly used in laboratories such as cell storage and sterilization. Glutaraldehyde solution with a concentration of 10 - 15% is often used in water treatment. Prevent the growth of bacteria, algae and viruses in water. The 50% glutaraldehyde solution is considered non-hazardous to the environment used to kill bacteria and fungi to help eliminate the main causes of disease in farmed shrimp.

There is also chitosan glutaraldehyde, which is also a safe disinfectant in aquaculture, chitosan is an available substance in shrimp and crab shells, extracted and applied in many fields.

Some note :

Glutaraldehyde has no long-term environmental effects. However, when in high concentrations, it is still toxic to fish, crustaceans, algae in ponds. Therefore, farmers should consult with experts or read the user manual on the package. To know the exact amount of glutaraldehyde needed for each type of shrimp, the differences are different.

The activity of glutaraldehyde increases with increasing pH from 4.0 -> 9.0 and reaches the highest value when PH = 8.0. When the pH is above 9.0, the activity will decrease until the pH is around 11. Therefore, do not use glutaraldehyde when treating water with too high pH (> 9).
Glutaraldehyde is less toxic to freshwater fish than to brackish / salty fish.
Glutaraldehyde is stable at room temperature, but not stable at high temperatures and alkaline environments. Under anaerobic conditions glutaraldehyde is converted into 1,5-pentanediol (an organic alcohol - C5H12O2).
In water treatment systems, if glutaraldehyde is left in the water, use NaHSO3 (Sodium bisulfite) to inactivate glutaraldehyde before being discharged.