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| Number | Title | Issue Date |
| 6159364 | Water treatment system based on denitrification To allow compact and simple design of a water treatment system capable of denitrification, an anaerobic treatment vessel 3 is provided downstream of an aerobic treatment vessel 2, and a filter layer 5 having a large number of carriers for microbes filled ... | 12/12/2000 |
| 5578202 | Water processing system for highly contaminated water In a water processing system for processing highly contaminated water, comprising an anaerobic chamber, an aerobic chamber, a buffering chamber, and a recycle for recycling part of the water received in the buffering chamber back to the anaerobic chamber,... | 11/26/1996 |
