| 摘要 |
PROBLEM TO BE SOLVED: To provide a producing method of phosphate fertilizer in which the content of soluble phosphoric acid meets with an official specification for fertilizer by removing metals from slag generated by melting sewage sludge.SOLUTION: Although it is hoped to use sewage sludge melting slag as phosphate fertilize since sewage sludge melting slag comprises a lot of phosphor, a producing method of fertilizer has not been established, which meets official specification for fertilizer (quality criterion, such as component and nature of fertilizer defined based on fertilizer regulating law). There is proposed a producing method of fertilizer meeting with the official specification for fertilizer in which utilization ratio of sewage sludge melting slag is by improved, and a problem, also recognized as social needs, in treatment of waste generated from a sewage treatment facility.SELECTED DRAWING: None |
