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The impact of free cyanide (CN) and thiocyanate (SCN) on the CN (CDO) and SCN degraders (TDO) to nitrify and denitrify aerobically was evaluated under alkaline conditions. The CDO’s were able to nitrify under cyanogenic conditions, achieving NH4-N removal rates above 1.66 mg NH4-N.L.h, except when CN and SCN loading was 15 mg CN/L and 50 mg SCN.L, respectively, which slightly inhibited nitrification. The TDO’s were able to achieve a nitrification rate of 1.59 mg NH4-N.L.h in the absence of both CN and SCN, while the presence of CN and SCN was inhibitory, with a nitrification rates of 1.14 mg NH4-N.L.h. The CDO’s and TDO’s were able to denitrify aerobically, with the CDO’s obtaining NO3-N removal rates above 0.67 mg NO3-N.L.h, irrespective of the tested CN and SCN concentration range. Denitrification by the TDO’s was inhibited by CN, achieving a removal rate of 0.46 mg NO3-N.L.h and 0.22 mg NO3-N.L.h when CN concentration was 10 and 15 mg CN.L, respectively. However, when the CDO’s and TDO’s were co-cultured, the nitrification and aerobic denitrification removal rates were 1.78 mg NH4-N.L.h and 0.63 mg NO3-N.L.h irrespective of CN and SCN concentrations.

Heterotrophic nitrification-aerobic denitrification potential of cyanide and thiocyanate degrading microbial communities under cyanogenic conditions