a system for industrial production of fertilizer by a progressive digestion process whereby organic matter is digested by optimizing , under controlled conditions , the natural digestive process indigenous to any degrading organic material . the organic input is conveyed through an array of vessels following a sequence of controlled mesophilic and thermophilic digestion steps such that each step facilitates the digestion of certain component of the incoming organic material . the last stage is carried out at a thermophilic temperature to inactivate any remaining vegetative cells of pathogenic microorganisms in the mixture , while supporting the growth of soil beneficial , non - pathogenic , thermophilic microorganisms . the resulting product is a dark , malodor and pathogen free , biologically active , fully digested and shelf stable liquid organic fertilizer .