用喷泉式生物膜反应器去除养鱼水体中的氮素

Fountains biofilm reactor used for nitrogen element removal in fishing water

介绍了一种用于净化养鱼水体的喷泉式生物膜反应器.首先在清洁的水中放养金鱼,考察水中氮素和COD浓度的增长规律.随后分别采用简单曝气和加入喷泉式生物膜反应器2种方法对水质进行净化,并比较他们的效果.结果表明:简单曝气可以降低NH4+–N浓度,但不能有效去除总氮(TN),而采用喷泉式生物膜反应器则可以有效地降低TN.通过TN去除动力学的分析,TN去除速率随着初始浓度的增加而增加,表现为Monod模型.其中C/N比对TN去除速率有明显影响,C/N比由5∶1提高到15∶1时,相应的TN去除速率(rmax)和饱和常数(KS)分别提高了32%和降低了21%.

Fountains biofilm reactor was used for purification of fishing water. Goldfishes were cultured in clean water to investigate regularity of nitrogen and COD concentration increasing at first. Hereafter, two protocols, simple aeration and fountains biohilm reactor,were employed for the water purification, and compared with their impact on water quality improvement. The experimental results indicated that simply aeration was only achieved for NH4＋ N concentration decreasing, but total nitrogen TN concentration was not effectively removed. On the contrary ,TN was effectively removed based on the fountains biofihn reactor. TN removal rate increased with increasing initial TN concentration, which fits Monod model through TN-removal kinetic analysis. Here C/N ratio had obvious effect on TN removal rate, and maximum TN-removal rate r and half-maximum-rate concentration Ks were increased by 32 % and decreased by 21% when C/N was increased from 5：1 to 15：1 ,respectively.