The invention relates to the technical field of
sewage treatment and in particular relates to a
solid carbon source as well as a preparation method and application thereof. The
solid carbon source is obtained by uniformly mixing at least three substances rich in
cellulose,
pelletizing and firing. The
solid carbon source is placed in an
oxygen-poor tank to supply
nutrient substances to microorganisms,
sewage which is homogenized and averaged sequentially flows through a pre-
denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a
sedimentation tank to be treated,
total nitrogen content of discharged water is equal to or less than 10mg / L, and
total phosphorus content is equal to or less than 0.5mg / L. The
solid carbon source is made of multiple substances rich in
cellulose, fibers of various substances can be easily penetrated and wound, after mixing and firing are carried out, a compact
cellulose layer structure can be formed, so that release rate of the
solid carbon source is greatly reduced, and a carbon source in the
sewage can be stable and sufficient for a long time; besides, the
solid carbon source is made of multiple substances, abundant
nutrient substances can be supplied to the microorganisms, different functions requirements for
metabolism can be met, and utilization ratio of the carbon source is increased.