Protein agglomeration is inhibited in a protein-containing liquid, within an industrial processing plant, using a microwave resonance cavity having an inlet conduit and an outlet conduit. The liquid is transported into and out of the cavity, and while within the cavity, it is exposed to a microwave electromagnetic field. This field exposure reduces the tendency of proteins within the liquid to agglomerate, and inhibits coagulation or protein deposition for an extended period of time after leaving the cavity.