Biological denitrification for nitrate removal from groundwater using mixed carbon sources
生物反硝化去除地下水中硝酸盐的混合碳源研究

Wheat straw, sawdust and ethanol were selected as carbon sources for denitrification microorganisms to remediate nitrate from groundwater. The effect of wheat straw, sawdust, ethanol, wheat straw+ethanol, sawdust+ethanol as well as wheat straw+sawdust as carbon sources to remove nitrate from the simulated groundwater were compared. The results showed that the reactor packed with wheat straw had good nitrate removal efficiency, but the effluent from the reactor was colored and had a bad odor. The reactor packed with sawdust +ethanol had a better performance than the reactor packed with sawdust or ethanol alone. The ratio of carbon and nitrogen (C/N) 40 was beneficial to nitrate removal. When using sawdust as carbon source, 0.5% ethanol (the percentage of ethanol to the amount of carbon sources) had a significant effect on improving denitrification.