| Abstract |
| Bench scale experiment was carried out two modes. One was conducted to test the self-granulation of suspended activated sludge and the other to certify simultaneous nitrogen and phosphorus removal under anoxic condition. The pilot scale experiment was studied on the reaction of simultaneous nitrogen and phosphorus removal by the granular activated sludge. In one mode of bench experiments, when an activated sludge is put in a granulation reactor, it becomes suspended. With interparticle bridging due to turbulence, the granulation process starts and results in a decrease of SVI. As granulation process goes on, an anaerobic condition developed inside the granulated sludge particles produces black spots on them. And then the growth of filamentous bacteria renders increased SVI. but eventually SVI decreases due to regranulation through interparticle bridging between filamentous bacteria. In other mode of bench experiments, simultaneous reactions of phosphorus release and uptake, and also denitrification were observed under anoxic condition with high organic and nitrate loading. However the rate and the degree of P release were lower than that occurred under anaerobic condition. From the pilot scale experiment operated to granular activated sludge, simultaneous phosphorus and nitrogen removal were showed. The results of the pilot experiment were due to the inner part of granular sludge to be anoxic and anaerobic condition. |
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| Key Words |
| simultaneous phosphorus and nitrogen removal, denitryfing phosphorus removal bacteria, anoxic condition, phosphorus removal metabolism |
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