I understand your question. ...

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I understand your question. But I do not understand the reason for using anaerobic digestion.  When using the proper microbes all waste is reduced into their elemental/nutritional state.  There is no leftover. Only potable drinking water. One earlier comment caught my eye. "Remaining ​organic matter ​are difficult ​to biodegrade ​by anaerobic ​process. ​However it can ​be removed by ​aerobic process.​ "