Particulate-biofilm, expanded-bed technology for high-rate, low-cost wastewater treatment: Nitrification

WATER RESEARCH

卷:39

Article

Dempsey, MJ ; Lannigan, KC ; Minall, RJ

关键词: nitrification;    particulate biofilm;    expanded bed;    fluidised bed;    wastewater treatment;    ammonia oxidation;   

DOI  :  10.1016/j.watres.2004.12.017

来源: Elsevier

【 摘 要 】

The performance of a particulate-biofilm, expanded-bed process for nitrification of activated sludge final effluent (ASFE) is reported for a plant receiving mixed industrial and domestic wastewater. The support material for the particulate-biofilms was glassy coke, to which the nitrifying bacteria attached and formed a highly active biofilm. An average nitrification rate of 1.7 +/- 0.6 kg m(expanded bed)(-3) d(-1) was recorded during operation of the bioreactor, which had a hydraulic residence time of 15 min. On average, the ASFE contained 12.6 +/- 3.7 g m(-3) NH3-N, which was reduced to 2.6 +/- 3.3 g m(-3) NH3-N. Furthermore, transfer of 10-12% of the oxygen in air was achieved using counter-current aeration. This investigation has demonstrated that a high rate of nitrification can be achieved with a particulate-biofilm, expanded-bed process. It has also demonstrated that the process can operate without backwashing and still remove particulate material from the ASFE feed. (c) 2005 Elsevier Ltd. All rights reserved.

【 授权许可】

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