When you say "domestic" if ...

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When you say "domestic" if you are referring to residential (or office complex) the answer is 1. Bio Digester. 2. microbial species RNA (not DNA) Archaea. 3. Your choice of discharge options.  To be energy efficient connect this device to a bio generator.  During the "BIOREMEDIATION " process as sludge organic compounds are being reduced to their elemental/nutritional state they release electrons which can be collected and used and connected to your residential electric grid.   Not in wide use. But it is an answer to your question.