The metabolism of the digester microorganism is ordinarily accompanied with waste which often is excreted by the microorganism as in condensed matter and as such dissolved in the liquid environment. However, when the concentration of these metabolism wastes reaches a certain level, then the solutes spontaneously suffer change of state by a process known as homogeneous nucleation, with some changing into microscopic gas bubbles and others into microscopic solid particles. As observed already, ordinarily these particles are dynamically extracted from the bioreactor. The separation process for extracting the particles from the digester-bioreactors collects the particles into an entrained bed of particles. The stream of particulates usually is pumped into a container storage tank.
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