Experimental and modelling study of drinking water hydrogenotrophic denitrification in packed-bed reactors

Microbial community in a hydrogenotrophic denitrification reactor based on pyrosequencing

“…It was apparent that hydrogenotrophic denitrification could perform well when initial nitrate loading was less than 105 mg L −1 ; however, denitrification was suppressed and nitrite accumulated at initial nitrate loading exceeding 105 mg L −1 . This may be due to the fact that high nitrate concentration inhibited activity of reductase, which was in accordance with reported studies (Park et al 2005;Vasiliadou et al 2009). …”

Chemolithotrophic denitrification in biofilm reactors

“…Although polymeric membranes feature high specific surface areas, natural materials usually result in inexpensive solutions and optimal performances. Vasiliadou et al [12] operated a triple stage PBR packed with silicic gravel which achieved high denitrification rates up to 6.2 kg N-NO 3 À /m 3 d at influent nitrate concentration of 340 mg N-NO 3 À /L and hydraulic loading rates of 11.5 m 3 /m 2 d.…”

“…Carrier materials used in these systems have an extremely high specific surface area which allows high biomass concentrations and, thus, the treatment of high nitrate loadings. Several studies report higher denitrification rates in biofilm systems such as fixed-bed or fluidized-bed reactors compared to suspended growth reactors [12][13][14][15].…”

Hydrogenotrophic denitrification of potable water: A review

“…In addition, the growth rate of autotrophic denitrifying bacteria ensures low biomass build-up and limited operating problems. Thus, hydrogenotrophic bacteria have been successfully used for drinking water nitrate elimination to acceptable levels either in pure [4][5][6][7] or in mixed-cultures [8][9][10][11][12][13][14][15].…”