We propose a practical new concept for a bioreactor to remove microbiota from waste water. It will convert potentially harmful microorganisms to innocuous cellulosic structures which can then be biologically degraded further. This process will use no filters or other expendibles and operate at micro- or partial gravity. It will provide hygiene and possibly potable water depending on influent quality. Our concept innovatively exploits the unique biology of Dictyostelium. While executing its life cycle, Dictyostelium converts, its food, a range of microbiota, into cellulose and protoplasm. In liquids, the Dictyostelium ameba stage actively feeds and divides until its food is exhausted without completing its life cycle. Culmination occurs only on solid surfaces where it differentiates into the mature cellulose-containing stage. Since a reliable waste reclamation method allowing for successful long term manned missions is an essential component of a regenerative life support system, the innovation is relevant and important.
