Del Pozo R, Diez V
Chemical Engineering, Faculty of Science, University of Burgos, Misael Bañuelos s/n 09001 Burgos, Spain.
Water Res. 2003 Sep;37(15):3561-8. doi: 10.1016/S0043-1354(03)00273-2.
A combination of two fixed-film bioreactors (FFB) with arranged media, the first anaerobic and the second aerobic, connected in series with recirculation was fed continuously for 133 days with wastewater from a poultry slaughterhouse. Oxidation of the organic carbon compounds and nitrification were carried out in the aerobic FFB and methanogenesis and denitrification were performed in the anaerobic FFB. The average organic loading rate was 0.39 kg COD/m3d and 92% removal efficiencies of organic matter were achieved. COD-removal occurred mainly in the anaerobic FFB, increasing when the recirculation ratio rose from 1 to 6 due to the increase in the anoxic denitrification. The influence of the C/N ratio of the raw wastewater over the proportion in which the COD-removal was carried out by oxidation in the aerobic FFB, methanogenesis or denitrification in the anaerobic FFB was studied. When the volume of the aerobic FFB became smaller than that of the anaerobic one the fraction of organic matter removed in the anaerobic FFB increased, but also the ratio between the respective volumetric rates (rCODan/rCODae) increased. High recirculation and low C/NO-N ratio in the anaerobic FFB feed favoured the denitrification to the detriment of the methanogenic process. Regarding nitrogen removal for nitrogen applied loads around 0.064 kg TKN/m3d the removal efficiency was of 95%, which decreased to 84% for 0.14 kg TKN/m3d. The stability of the nitrification process was the controlling factor of the nitrogen removal. High ammonia concentration caused by high recirculation ratio, specially when the aerobic FFB volume was smaller, caused nitrification inhibition which destabilised the system.
将两个装有填料的固定膜生物反应器（FFB）组合在一起，第一个为厌氧型，第二个为好氧型，串联连接并进行循环，连续133天用家禽屠宰场的废水进料。好氧FFB中进行有机碳化合物的氧化和硝化作用，厌氧FFB中进行甲烷生成和反硝化作用。平均有机负荷率为0.39 kg COD/m³·d，有机物去除效率达到92%。COD去除主要发生在厌氧FFB中，当循环比从1增加到6时，由于缺氧反硝化作用的增强，COD去除量增加。研究了原废水的C/N比对好氧FFB中通过氧化、厌氧FFB中通过甲烷生成或反硝化进行COD去除比例的影响。当好氧FFB的体积小于厌氧FFB时，厌氧FFB中去除的有机物比例增加，但各自的体积速率之比（rCODan/rCODae）也增加。厌氧FFB进料中的高循环和低C/NO-N比有利于反硝化作用，不利于甲烷生成过程。对于约0.064 kg TKN/m³·d的氮负荷，氮去除效率为95%，当氮负荷为0.14 kg TKN/m³·d时，去除效率降至84%。硝化过程的稳定性是氮去除的控制因素。高循环比导致的高氨浓度，特别是当好氧FFB体积较小时，会导致硝化抑制，使系统不稳定。
