Removing Nitrate With a Methylotrophic Fluidized Bed: Technology and Operating Performance

A pilot biological luidized-bed plant with a capacity of 40 m 3 /h has been in operation since January 1988 at De Blankaart drinking water production center for removing nitrate from surface water. Methanol is used as the reductant. With a nitrate removal efficiency of 9.0 kg NO 3 - /m 3 reactor.day at 3.5 o C, the system has shown superior performance compared with conventional fixed-bed biofilm reactors. With an influent concentration of 75 mg NO 3 - /L, complete nitrate removal was achieved at an empty bed contact time of 15 min. Nitrite was not detected in the efluent, provided there was a slight excess of methanol (1-2 mg/L)

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