NOVELTY - Decomposition of environmental pollutant involves making a non-porous film (2) sorb the environmental pollutant (5) to a region where decomposition microorganisms (3) inhabit then supplying to microorganisms by permeation through non-porous film at a speed based on molecule permeation performance of the film. The non-porous film is interposed between region where environmental pollutant exists and region where decomposition microorganisms inhabit thus shielding the microorganisms from to-be-processed region.    USE - Processing environmental pollutants using bioreactors for wastewater treatment (claimed).    ADVANTAGE - An environmental pollutant can be decompose simply and at low cost without almost affecting survival of environmental pollutant decomposition microorganisms, even if the to-be-processed area is a hostile environment e.g. acidic, basic or inhabited by toxic compounds e.g. cyanide since most cyanide compounds are not permeable in the container. The transmission rate of an environmental pollutant is controllable by changing film thickness and vinyl-acetate content rate. The diffusion of environmental pollutant leaked by a deterioration of water barrier sheet can be kept at minimum. The leaked environmental pollutant can be decomposed and the diffusion can be kept to a minimum. Waste water treatment can be efficiently performed in a short time and microorganisms can be easily supplied. Continuous and batch processing of wastewater treatment can be done and space saving can be attained.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for    (1) bioreactor consisting of container made from non-porous film where decomposition microorganisms are accommodated; and    (2) processing of wastewater using bioreactors.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view and a longitudinal cross-section of the bioreactor.    Bioreactor (1)    Non-porous film (2)    Environmental pollutant decomposition microorganisms (3)    Container (4)    Environmental pollutant. (5)