| abstract |
(57) [Problem] To provide a method for dewatering sludge that reduces the water content of sludge cake and forms strong flocculated flocs. SOLUTION: A polyoxyethylene alkylamine is added to sludge, and then a polymer flocculant is added, followed by dehydration. As the polyoxyethylene alkylamine, polyoxyethylene laurylamine is preferable. As the polymer flocculant, a known cationic, amphoteric, anionic or nonionic polymer flocculant can be used. |