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Lukhanyo Mekuto,Young Mo Kim,Seteno K. O. Ntwampe,Maxwell Mewa-Ngongang,John Baptist N. Mudumbi,Nkosikho Dlangamandla,Elie Fereche Itoba-Tombo,E. A. Akinpelu 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.2
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<SUP>-1</SUP>.h<SUP>-1</SUP>, except when CN⁻ and SCN⁻ loading was 15 mg CN⁻/L and 50 mg SCN⁻.L<SUP>-1</SUP>, respectively, which slightly inhibited nitrification. The TDO’s were able to achieve a nitrification rate of 1.59 mg NH₄⁺-N.L<SUP>-1</SUP>.h<SUP>-1</SUP> 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<SUP>-1</SUP>.h<SUP>-1</SUP>. 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<SUP>-1</SUP>.h<SUP>-1</SUP>, 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<SUP>-1</SUP>.h<SUP>-1</SUP> and 0.22 mg NO₃⁻-N.L<SUP>-1</SUP>.h<SUP>-1</SUP> when CNconcentration was 10 and 15 mg CN⁻.L<SUP>-1</SUP>, 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<SUP>-1</SUP>.h<SUP>-1</SUP> and 0.63 mg NO₃⁻-N.L<SUP>-1</SUP>.h<SUP>-1</SUP> irrespective of CN⁻ and SCN⁻ concentrations.