Membrane fungicide DBNPA

DBNPA, also known as 2,2-dibromo-3-nitropropanamide, is a widely used industrial fungicide. It is a biodegradable fungicide used to control the growth of microorganisms, especially in industrial circulating cooling water systems, lubricants for metal processing, pulp, and wood environments. DBNPA can quickly penetrate the cell membrane of microorganisms and act on specific protein groups, causing the normal redox process of cells to stop, leading to cell death 

DBNPA is relatively stable under acidic conditions, but easily decomposes under alkaline conditions. It is slightly soluble in water, and at 25 ℃, 100 grams of water can dissolve 1.5 grams of DBNPA. Increasing the pH value, heating, UV light, or fluorescence irradiation can increase its solubility 

The molecular formula of DBNPA is C3H2Br2N2O, which is a white crystalline powder at room temperature with a moldy and spicy odor. It is soluble in organic solvents such as acetone, polyethylene glycol, benzene, and ethanol 

In a study, d-tyrosine was used to enhance the resistance of DBNPA to sulfate reducing bacterial biofilms on carbon steel. Through this combination, the fixed cell count and mass loss were significantly reduced, and the enhancement effect was confirmed through electrochemical testing 

In the technical specification, DBNPA, as a non oxidizing bactericide, is required to effectively inhibit the growth of bacteria and the formation of biological slime on the membrane surface under low dosage, reduce the number of cleaning times, and have the characteristics of durability, little impact on pH value, little environmental pollution, and no foam 

Suppliers are required to provide hygiene permits that comply with drinking water quality standards and ensure that DBNPA is well compatible with various ultrafiltration and reverse osmosis membranes, without damaging membrane components 

The toxicity of DBNPA is moderate and harmful by inhalation, skin contact, and ingestion. In the manufacturing process, the potential harm of waste and by-products to the environment should also be given attention. DBNPA should be sealed and packaged in cardboard drums lined with plastic film, and stored in a cool, dry, and ventilated place, away from flames and heat sources 

DBNPA is recommended by Dow as a cost-effective fungicide for preventing biofilm fouling in reverse osmosis membranes