STATE OF THE ART IN EUROPE OF THE MOVING BED BIOFILM REACTOR (MBBR) PROCESS
The paper describes the moving bed biofilm reactor (MBBR) and presents applications of wastewater treatment processes in which this reactor is used. The MBBR processes have been extensively used for BOD/COD-removal as well as for nitrification and denitrification in municipal as well as industrial wastewater treatment. This paper focuses on the municipal applications. The most frequent process combinations are presented and discussed. Basic design data obtained through research as well as data from practical operation of various plants are presented. It is demonstrated that the MBBR may be used in an extremely compact high-rate process (< 1 h total HRT) for secondary treatment. Most European plants require Premoval and performance data from plants combining MBBR and chemical precipitation is presented. Likewise data from plants in Italy and Switzerland that are implementing nitrification in addition to secondary treatment are presented. The results from three Norwegian plants that are using the so-called combined denitrification MBBR process are discussed. Nitrification rates as high as 1.2 g NH4-N/m2.d at complete nitrification were demonstrated in practical operation at low temperatures (11 °C), while denitrification rates were as high as 3.5 g NO3-Nequiv./m2.d. Depending on the extent of pre-treatment, the total HRT of the MBBR for N-removal will be in the range of 3-5 hrs.
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Document Type: Research Article
Publication date: 01 January 2004
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