ORIGINAL RESEARCH
Rice Husk as Carbon Source and Biofilm
Carrier for Water Denitrification
L. Shao, Z. X. Xu, W. Jin, H. L. Yin
State Key Laboratory of Pollution Control and Resource Reuse,
College of Environmental Science and Engineering, Tongji University, Shanghai-200092, P. R. China
Pol. J. Environ. Stud. 2009;18(4):693–699
KEYWORDS
ABSTRACT
We investigated rice husk as the sole carbon source as well as biofilm carrier in the biological denitrification
of wastewater in up-flow laboratory reactors. Fast startup of the reactor and high nitrate removal efficiency
was observed. The highest denitrification rate (about 0.096kg/m3·d) was achieved when flow rate and
nitrate concentration were 41.4L/d and 25.0mg/L, respectively. Flow rate and nitrate concentration of the influent
were observed to have a significant effect on nitrate removal efficiency. The reactor had the ability to
accommodate a wide range of pH (6.5-8.5) and DO (1.5-4mg/L). A time-dependent decrease in nitrate removal
efficiency was observed after 72 days of operation. And the addition of new rice husk brought about a rapid
increase of nitrate removal efficiency. Results showed that rice husks can be an economical and effective carbon
source for the nitrate removal process.
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