Removing nitrate with a methylotrophic fluidized-bed-technology and operating performance
Liessens, J.; Germonpré, R.; Beernaert, S.; Verstraete, W. (1993). Removing nitrate with a methylotrophic fluidized-bed-technology and operating performance. J. Am. Water Works Assoc. 85(4): 144-154
In: Journal of the American Water Works Association. American Water Works Association: Baltimore. ISSN 0003-150X; e-ISSN 1551-8833, more
A pilot biological fluidized-bed plant with a capacity of 40 m3/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 NO3-/m3 reactor.day at 3.5-degrees-C, the system has shown superior performance compared with conventional fixed-bed biofilm reactors. With an influent concentration of 75 mg NO3-/L, complete nitrate removal was achieved at an empty bed contact time of 15 min. Nitrite was not detected in the effluent, provided there was a slight excess of methanol (1-2 mg/L). Residual methanol was easily removed by the existing downstream drinking water treatment processes.
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