The invention belongs to the technical field of
sludge treatment and recycling and discloses a method for enhancing
anaerobic digestion and
methane production of excess
sludge by zero-valent iron and
activated carbon. The method comprises steps as follows: (1), the excess
sludge, inoculated sludge and water are mixed, pH is regulated to 6-7.5,
solid content of a mixture is enabled to be 8%-12%, and mixed sludge is obtained; (2), the mixed sludge,
activated carbon and zero-valent iron are added to an
anaerobic digestion device, and
anaerobic digestion is implemented; (3), gas produced in the anaerobic
digestion process is collected. According to the method, the anaerobic
digestion is better promoted by adding
activated carbon and zero-valent iron simultaneously; the method is simple,
reaction conditions are mild, a gas producing effect is better than that of a traditional method, recycling, harmless and reducing treatment of the excess sludge of a
sewage treatment
plant is realized, and the method has good economic and
social benefits.