杀菌剂对不同生长状态下生物黏泥的作用效果

Effect of biocide on biofouling formation at different growth conditions

在不同状态下培养生物黏泥,考察生物黏泥的生长特性和ClO2对不同类型生物黏泥的杀菌过程,确定ClO2有效杀菌时间和杀菌质量浓度。结果表明:当培养液中营养配比分别为ρ(CODCr):ρ(N):ρ(P)=50:10:11、00:10:1和150:10:1时,生物黏泥的湿重和胞外聚合物的含量增加;当培养状态为ρ(CODCr):ρ(N):ρ(P)=100:10:1时,生物黏泥的脱氢酶活性含量最大;当培养液中碳源质量浓度增加时,ClO2作用的有效时间随之延长,分别为1、1.5、1.75 h,ClO2有效杀菌质量浓度也随之增大,分别为0.5、1.5和2 mg/L。

The growth characteristics of biofouling at different cultivating conditions were investigated. Then, the antibacterial effect of chlorine dioxide on biofouling at different cultivating conditions was investigated, and the effective antibacterial time and concentration of chlorine dioxide were obtained. The results show that the wet weight and extra-cellular polymeric substances of biofouling increase when nutritive proportions are ρ （CODcr ） ：ρ （ N ） ：ρ （P）= 50：10 ： 1, 100 ： 10 ： 1 and 150 ： 10 ： 1, respectively. However, dehydrogenase activity （DHA） of biofouling is the biggest at ρ（CODcr） ：ρ（N） ：ρ（P） = 100 ： 10 ： 1. The effective antibacterial time chlorine dioxide acting increases with the mass concentration of carbon increasing, which is 1,1.5 and 1.75 h, respectively. In addition, effective antibacterial concentration of chlorine dioxide also increases, which is 0. 5,1.5 and 2 mg/L, respectively.