| 摘要 |
PROBLEM TO BE SOLVED: To provide a digested sewage sludge treatment method which is suitable for dehydration treatment by a centrifugal dehydrator or a screw press dehydrator, enables a further reduction of water content in a dehydrated cake, and enables a reduction of the generation of magnesium ammonium phosphate (MAP) scales. SOLUTION: An inorganic coagulant is added to digested sewage sludge, and then a polymer coagulant composition (A) containing a polyamidine-based coagulant and an aminoalkyl (meth)acrylate-based cationic coagulant and having a cation equivalent of less than 5 meq/g is added thereto to subject the material to be treated to hydration treatment. COPYRIGHT: (C)2009,JPO&INPIT
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