[Biofilm formation in an external loop three phase fluidized bed reactor].
The experiment on biofilm formation in an external loop three phase fluidized bed reactor was presented in this paper. The effect of the value of sludge addition and C/N ratio were studied. The experiment result showed that at the temperature of 20-30 degrees C, when the diameter of granular activated carbon was 0.125-0.5 mm, the value of sludge addition at 2 g x L(-1) was more propitious to the formation of biofilm than 5 g x L(-1). Formation of biofilm in fluidized bed was the rapidest when C/N ratio was between 8-12. It was difficult and leaned to form filamentous bulking sludge when C/N > or = 14. On the basis of the success of attached film, the influence of hydraulic residence time (HRT) on the value of suspended sludge and the value of biofilm was studied. The result showed that while HRT expended and the value of suspended sludge increased, the value of biofilm also increased, when HRT was between 1-3 h. But when HRT exceeded 5h, HRT expended and the value of biofilm decreased. when HRT was between 4-5 h, the value of suspended sludge and the value of biofilm were steady.
Zhang
Jin-Sheng
JS
(College of Environmental Science and Technology, Hunan University, Changsha 410082, China. jecalsamy@163.com
Yuan
Xing-Zhong
XZ
Zeng
Guang-Ming
GM
Liang
Yun-Shan
YS
D018441:Biofilms; D019149:Bioreactors / Q000382:microbiology*; D002244:Carbon / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D012722:Sewage / Q000737:chemistry; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*
D012722:Sewage; D002244:Carbon; D009584:Nitrogen