Dempsey M J, Lannigan K C, Minall R J
Department of Biological Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK.
Water Res. 2005 Mar;39(6):965-74. doi: 10.1016/j.watres.2004.12.017.
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.
本文报道了一种用于活性污泥最终出水（ASFE）硝化的颗粒生物膜膨胀床工艺在处理混合工业和生活废水的工厂中的运行情况。颗粒生物膜的载体材料是玻璃状焦炭，硝化细菌附着其上并形成了高活性生物膜。在生物反应器运行期间，记录到平均硝化速率为1.7±0.6 kg m（膨胀床）⁻³ d⁻¹，其水力停留时间为15分钟。平均而言，ASFE中含有12.6±3.7 g m⁻³的氨氮，经处理后降至2.6±3.3 g m⁻³的氨氮。此外，通过逆流曝气实现了空气中10 - 12%的氧气转移。该研究表明，颗粒生物膜膨胀床工艺可实现高速率硝化。同时也表明，该工艺无需反冲洗即可运行，且仍能从ASFE进料中去除颗粒物质。
