Development of recovery process of valuable elements from inorganic sludges

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A large amount of phosphorus is contained in sewage sludge, and hence recovery of phosphorus from sewage sludge and recycling as phosphorous resources must be quite significant. This research group is working on the chemical recycling method of phosphorus contained in iron- and steel-making slags. Then, in the present project, the developing process has been applied to sewage sludge, and the possibility of phosphorus recovery from sewage sludge was examined. It was found that SiO2 addition was effective for the recovery of phosphorus, but the separation from the other constituents was quite difficult. It was finally suggested that melting under a reducing atmosphere was effective for the removal of ion, expecting the selective recovery of phosphorus.