ELECTRON DONOR SUPPLYING APPARATUS AND DENITRIFICATION BIOREACTOR

摘要

PROBLEM TO BE SOLVED: To provide an electron donor supplying apparatus capable of preserving an electron donor substance in atmosphere without leaking it, and starting to supply the electron donor substance into water environment after a certain period of time passes in the water environment.SOLUTION: In the electron donor supplying apparatus 1 in which the electron donor substance to be an energy source for microorganism is slowly released at a speed dominated by a molecular transmitting performance from a first non-porous membrane part of a container and supplied to the microorganism surrounding the container, the first non-porous membrane part 2a on the outside surface of the container 4 is covered with the second non-porous membrane 2b, and the opposite side face of the face on the container side of the second non-porous membrane is covered by the third non-porous membrane 2c. The second non-porous membrane is a hydrophilic non-porous membrane which passes the electron donor substance when contacted with water, and the third non-porous membrane is such a non-porous membrane having biodegradability and steam non-permeability. By arranging the third non-porous membrane into a water environment where the microorganism lives, the electron donor substance is started to release after a certain period of time passes.