Complete nitrogen removal from waste and drinking water in a fluidized-bed bioreactor/Eliminación de nitrógeno de aguas residuales y agua para el consumo en un biorreactor de lecho fluidizado
| Autor: | L. Czakó, J. Holló, Zs. Csikor, P. Miháltz |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
0106 biological sciences
Denitrification Chemistry General Chemical Engineering Hydrostatic pressure 04 agricultural and veterinary sciences Pulp and paper industry 040401 food science 01 natural sciences Industrial and Manufacturing Engineering 0404 agricultural biotechnology Activated sludge Wastewater Fluidized bed 010608 biotechnology Nitrification Water treatment Aeration Food Science |
| Zdroj: | Food Science and Technology International. 2:165-171 |
| ISSN: | 1532-1738 1082-0132 |
| Popis: | The use of fluidized-bed bioreactors in waste and drinking water treatment has several advantages, the most significant of which is the specific removal rate, which is an order of magnitude higher than that of equivalent activated sludge processes. In this paper, the usual concept of nitrification-denitrification in separated units is replaced by a new concept in which the two processes are performed together in a single high-performance fluidized-bed. Based on the former nitrifying reactor, new equipment was designed. This reactor contained a fluidized bed with separated aerobic and anoxic sections for nitrification and denitri fication respectively. This was accomplished by the use of different-diameter sand as carrier material and appropriate reactor shape, recirculation, feed and aeration conditions. The reactor (20 L fluidized-bed volume) was operated for 3 months. It was fed with synthetic waste water (50 L/h) containing 25-40 mg NH4 +-N/L. Propionic acid and ethanol in a 1:4 ratio were used as the carbon source (2.3 g C/L) for deni trification, fed in at different points of the reactor. Ammonium removal reached 50%, while denitrification was 75%. The total nitrogen removal rate was 0.8-1.2 kg N/m 3.d. A new simple hydrostatic pressure method was used to monitor biofilm thickness in the fluidized bed. During the experiments the oxidation-reduc tion potential (ORP) was tested as a tool to monitor reactor performance; its use for the control of the process was found to be limited. |
| Databáze: | OpenAIRE |
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