The invention relates to a method for recycling
sludge, in particular to a method for enhancing efficient release and recycling of carbon and
phosphorus in
sludge in a gradient mode. According to the method for stepwise strengthening efficient release and recycling of carbon and
phosphorus in
sludge, the release efficiency of
phosphorus in different occurrence forms in the sludge is improved in a targeted mode, efficient release of
inorganic phosphorus and
organic phosphorus is achieved through the synergistic effect of multiple steps, meanwhile, efficient release and recycling of carbon are synergistically improved, and the method has the beneficial effects of improving the
utilization rate of carbon and phosphorus in sludge and improving the
utilization rate of carbon and phosphorus in sludge. The method is used for improving the overall resource recycling efficiency of carbon and phosphorus in the excess sludge and comprises the following steps: 1, pretreating the sludge; 2, pre-treating the green chelating agent to intensify the release of
inorganic phosphorus; 3, recovering
inorganic phosphorus; 4, resuspending the sludge; 5, strengthening sludge solubilization and
hydrolysis by using a peroxidant; 6, anaerobic recycling; 7, recycling carbon and phosphorus resources; the
recovery process is simple and convenient, the
loss rate is low, the phosphorus
recovery rate can reach 80%-99.5%, the
acid production efficiency is improved by 14 times or more, and the method has remarkable advantages.