シアン耐性菌の生育におよぼす金属イオンの影響 : 含シアン廃水の生物学的処理に関する研究(第2報)

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In the previous paper, the authours reported on the degradation of cyanide by a cyanideresistant bacterium. In the case of the applicaiotn of the bacterium to the treatment of the cyanidecontaining waste-water of an electroplating plant, it is characteristic of the waste-water that the heavy metal ions may interfere with treatment. So, we have studied, in the paper, the effect of heavy metal ions upon the growth of the cyanide-resistant bacterium. Ca(II), Fe(Ii), and Fe(III) ions accelerated the growth of the bacterium. Cu(II) and Zn(II) ions inhibited the growth, and their inhibitory effect grew stronger, parallel to the increase of theri ion concentration.10^<-4> of Cu(II) and 5×10<-4>M of Zn(II)ion represented the evident inhibitive effects respectively. Cd(II)ion inhibited the growth even when its concentration was very low (10^<-5>M), but Fe(II) ion exhibited a proteictive effect against the inhibitive effect of the Cd(II) ion. Co(II) ion (10^< : -3>M) inhibited the growth, but the inhibitory effect desappeared in the presence of 1,000 ppm CN^- ion or the addition of 5×10<-5>〜10<-3>M of Fe(II) ion .10<-5>〜10<-3>M of K_2Cr_2O_7 exhibited an inhibitory effect at a fairy low level. The bacterium cultured in the presence of Fe(II) ion had a higher cyanide degradation activity than did organisms cultured in the absence of Fe(II) ion.
社団法人日本生物工学会の論文
1973-03-25