Sludge deodorant as well as preparation method and deodorizing method thereof

The invention discloses a sludge deodorant. The sludge deodorant is prepared from the raw materials in parts by weight: 100 to 200 parts of shell powder, 1 to 5 parts of polysaccharide and 10 to 80 parts of active bacterium. According to the sludge deodorant disclosed by the invention, the shell powder is utilized as a carrier of the active bacterium, and the polysaccharide is added to provide nutrition for the active bacterium to keep activity of the active bacterium; in addition, the shell powder contains elements of Ga, Mg, Na, Zn, Fe, Cu, Mn, B, Mo and the like and also can provide a certain nutrition for the active bacterium; the shell powder has a lot of micropores and can effectively adsorb odor and organic matter in sludge; furthermore, the active bacterium using the shell powder as the carrier can effectively decompose the organic matter in the sludge to form carbon dioxide and water finally; thus, the odor of the sludge can be removed. In addition, a main ingredient of the shell powder is calcium ca