Abstract
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-flowlaboratory reactors.Anartificialwastewaterwitha 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 0.096kg/m3 d were achieved when flow rate and nitrate concentration were 41.4 L/d and 25.0mg/L, respectively. 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 30L/d. The reactor had the ability to accommodate awind rangeof pH (6.5–8.5) andDO (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.
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