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| Number | Title | Issue Date |
| 7470365 | Sludge concentration system which have functions for automatically charging a coagulant and for automatically controlling the concentration of a sludge The present invention provides a system for sludge treatment which transfers sludge into a dewatering device while maintaining the sludge density at a predetermined level constant suitable for dewatering the sludge even when the density of the precipitated sludge va... | 12/30/2008 |
