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Ncumisa Mpongwana,Seteno Karabo Obed Ntwampe,Lovasoa Christine Razanamahand,Boredi Silas Chidi,Elizabeth Ife Omodanisi 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Free cyanide (CN<SUP>-</SUP>) is a threat to metabolic functions of the microbial population used for the treatment of wastewater, particularly, total nitrogen removal (TN) consortia which gets inhibited by CN<SUP>-</SUP> in wastewater treatment plants (WWTPs). Many other methods are used to treat CN<SUP>-</SUP> prior to the TN removal stages; however, these methods increase the operational cost of the WWTPs. The capability of a microbial population to use multiple substrates is critical in WWTP and in eliminating inhibition associated with CN<SUP>-</SUP>. Previously, cyanide resistant bacteria were used to eliminate the inhibitory effect of CN<SUP>-</SUP> towards simultaneous nitrification and aerobic denitrification (SNaD). However, a study to predict the degradation efficiency of the microorganism was required. In this study, response surface methodology (RSM) and cybernetic models were used to predict and optimize SNaD performance for TN removal under CN<SUP>-</SUP> conditions. Physiological parameters influencing the SNaD were pH 6.5 and 36.5℃, with TN and CN<SUP>-</SUP> degradation efficiency of 78.6 and 80.2%, respectively. These results show a complete elimination of the CN<SUP>-</SUP>inhibitory effect towards SNaD and show the prediction ability of both RSM and the cybernetic models used. These results exhibited a promising solution in the control, management, and optimization of SNaD.
Ncumisa Mpongwana,Seteno Karabo Obed Ntwampe,Lovasoa Christine Razanamahandry,Boredi Silas Chidi,Elizabeth Ife Omodanisi 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Free cyanide (CN−) is a threat to metabolic functions of the microbial population used for the treatment of wastewater, particularly, total nitrogen removal (TN) consortia which gets inhibited by CN− in wastewater treatment plants (WWTPs). Many other methods are used to treat CN− prior to the TN removal stages; however, these methods increase the operational cost of the WWTPs. The capability of a microbial population to use multiple substrates is critical in WWTP and in eliminating inhibition associated with CN−. Previously, cyanide resistant bacteria were used to eliminate the inhibitory effect of CN− towards simultaneous nitrification and aerobic denitrification (SNaD). However, a study to predict the degradation efficiency of the microorganism was required. In this study, response surface methodology (RSM) and cybernetic models were used to predict and optimize SNaD performance for TN removal under CN− conditions. Physiological parameters influencing the SNaD were pH 6.5 and 36.5°C, with TN and CN− degradation efficiency of 78.6 and 80.2%, respectively. These results show a complete elimination of the CN− inhibitory effect towards SNaD and show the prediction ability of both RSM and the cybernetic models used. These results exhibited a promising solution in the control, management, and optimization of SNaD.
Performance of Fusarium oxysporum EKT01/02 isolate in cyanide biodegradation system
Enoch Akinbiyi Akinpelu,Adewole Tomiwa Adetunji,Seteno Karabo Obed Ntwampe,Felix Nchu,Lukhanyo Mekuto 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.2
This study reports a cyanide resistant and/or tolerant fungus, isolated from the rhizosphere of Zea mays contaminated with cyanide-based pesticides. The isolate was characterised using molecular biology. The effect of free cyanide and heavy metals on the growth of isolate in a synthetic gold mine wastewater was examined. The molecular analyses identified the isolate as Fusarium oxysporum EKT01/02 (KU985430/KU985431). The isolate had a free cyanide degradation efficiency of 77.6%. The results indicated greater growth impairment in culture containing Arsenic (optical density 1.28 and 1.458) and cyanide (optical density 1.315 and 1.385). Higher growth was observed in all cultures supplemented with extracellular polymeric substance. This study showed that the isolate possesses wide substrate utilisation mechanism that could be deployed in environmental engineering applications.