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Cause Of Membrane Blockage
- Aug 24, 2018 -

Cause of membrane blockage


(1) The MLSS on the inner surface of the membrane is increased, the endogenous respiration of the microorganism is intensified, and a black substance is accumulated on the surface of the membrane due to lack of oxygen and anaerobic respiration of the sludge. This black substance is mostly dead bacteria and residues thereof, and 20% of residual substances produced by microbial endogenous respiration are difficult to degrade;


(2) The extracellular polymer (EPS) gradually increases the contamination of the membrane surface. EPS is composed of polysaccharides, proteins, glycoproteins, lipoproteins and other macromolecular substances in the body of microorganisms. They form a viscous matrix that adheres cells to the surface of the membrane and holds the biofilm together. The increase of EPS causes a gel layer to form on the surface of the membrane, causing a decrease in flux;


(3) The main substance blocked by the membrane surface is a sticky polypeptide molecule and a protein molecule produced by normal metabolism of microorganisms, and a macromolecular substance containing a reactive group may interact with metal ions such as Ca2+, Mg2+, Fe3+ to form a condensation on the surface of the membrane. Adhesive layer.