In the treatment of biological wastewater, the 2 major types of technologies commonly used are the activated sludge method and the biofilm method. In the process of wastewater treatment, various chemical additives will be added to treat wastewater, such as flocculants, purifiers, wastewater treatment defoamers, and other surfactants, and different additives play different roles. Share the difference between the activated sludge method and the biofilm method and the role of the defoamer.
A.Difference between the activated sludge method and the biofilm method
(1) Activated sludge method: aerobic wastewater treatment by biochemical metabolism of suspended biological groups, the microorganisms in the wastewater reproduce faster and can flocculate and adsorb a large amount of suspended colloidal or dissolved pollutants in the wastewater, and absorb these substances into the cells, and completely oxidize these substances to release energy, CO2, and H2O with the participation of oxygen. the sludge concentration of the activated sludge method is generally 4g/ L.
(2) Biofilm method: Microorganisms are attached to the surface of the filler to form a gelatinous loaded biofilm, which has a fluffy flocculent shape and a large micropore area, and a strong adsorption effect. The sludge concentration of the biofilm method is generally 6-8g/L.
Water treatment plants will combine these 2 uses when performing wastewater treatment. Such a bioreactor that can have both film-mounted microorganisms and suspended microorganisms is called a composite bioreactor which has a high sludge concentration generally around 14g/L. Wastewater treatment defoamer in this plays a role in defoaming industrial wastewater to provide a more convenient treatment environment.
B.Wastewater treatment defoamer role and solutions
For this type of biological wastewater foam is generally used polyether defoamer (non-silicone defoamer) is for defoaming and foam control. Nanhui defoamer manufacturers produce wastewater treatment defoamer with a variety of fatty alcohols, fatty acid esters, polyamines, amides, polyoxyethylene ethers, hydrocarbons, and other emulsification polymerization through a special process to become a highly efficient emulsion-type defoamer. Fast defoaming speed, long foam inhibition time, high efficiency, low dosage, good acid and alkali resistance, and strong temperature applicability. And it will not affect the effective strains of water quality, not to mention that it will not cause film plugging.
