PURPOSE: To efficiently decompose a polluted decomposable matter by selecting a specified carrier to fix an aliphatic chlorine compound by use of decomposing ability of methylosinus trichosporium TSUKUBA without substantially degrading the decomposition ability thereof and use the new fixed microbe.

CONSTITUTION: A germ singly separated as a microbe belonging to methylosinus group and having decomposing power of aliphatic chlorine compound is methylosinus trichosporium TSUKUBA belonging to well-known methylosinus trichosporium. It is extremely important to select a carrier for fixing the germ body having the specifity of the carrier. This germ body can be fixed without substantially damaging the useful attribute only when agarose gel, calcium alginate gel and k-carrageenan gel are used as the carrier. The fixed germ body 1 is molded in the form of 3mm diameter bead or cube to be put into a vial 2 containing an inorganic salt medium, and in the case of decomposition of trichloroethylene, the decomposition rate is better than that obtained by free germ. Trichloroethylene is reduced by at least 90% after 14 hours by this method.