[FONT=新細明體]In this research, rice husk, a lignocellulosic waste from agroindustry, was investigated as the sole carbon source as well as biofilm carrier in the biological denitrification of wastewater in up-flow laboratory reactors.An artificial wastewater with a temperature in the range of 27–33 ?C was used. Fast startup of the reactor and a high nitrate removal efficiency was observed. The highest rates of denitrification about 0.096 kg/m3 d were achieved when flow rate and nitrate concentration were 41.4 L/d and 25.0 mg/L, respectively.[/FONT]
[FONT=新細明體]作為純碳源的工業廢料:稻殼,通過[/FONT]
[FONT=新細明體]Nitrite accumulation in treated water was practically zero during the experiments. Flow rate and nitrate concentration of the influent were observed to have a significant effect on nitrate removal efficiency. A very sharp decline was observed when the flow rate reached 30 L/d. The reactor had the ability to accommodate a wind range of pH(6.5–8.5) and DO(1.5–4). A time-dependent decrease in nitrate removal ratewas observed after 72 days of operation. And the addition of new rice husk brought about a rapid increase of the nitrate removal efficiency. The results showed that rice husk could be an economical and effective carbon source for the nitrate removal process.[/FONT]