The effect of temperature and sludge age on COD removal and nitrification in a moving bed sequencing batch biofilm reactor

被引:18
作者
Dulkadiroglu, H [1 ]
Cokgor, EU [1 ]
Artan, N [1 ]
Orhon, D [1 ]
机构
[1] Istanbul Tech Univ, Dept Environm Engn, ITU Insaat Fak, TR-34469 Istanbul, Turkey
关键词
moving bed; nitrification; SBR; sludge age; temperature effect;
D O I
10.2166/wst.2005.0395
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study investigates the effect of temperature and the sludge age on the performance of a moving bed sequencing batch biofilm reactor (MBSBBR) for COD removal and nitrification. The experiments are conducted in a lab-scale MBSBBR operated at three different temperatures (20, 15 and 10 degrees C) with a synthetic feed simulating domestic sewage characteristics. Evaluation of the results revealed that removal of organic matter at high rates and with efficiencies over 90% was secured at all operation conditions applied. The nitrification rate was significantly influenced by changes in temperature but complete nitrification occurred at each temperature. The nitrification rates observed at 20 and 15 degrees C were very close (0.241 mg NOx-N/m(2) d, 0.252 mg NOx-N/m(2) d, respectively), but at 10 degrees C, it decreased to 0.178 mg NOx-N/m(2) d. On the other hand, the biomass concentration and sludge age increased while the VSS/TSS ratios that can be accepted as an indicator of active biomass fraction decreased with time. It is considered that, increasing biofilm thickness and diffusion limitation affected the treatment efficiency, especially nitrification rate, negatively.
引用
收藏
页码:95 / 103
页数:9
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