甲苯二胺对厌氧微生物活性的影响

Effect of toluene diamine on activity of anaerobic microorganism

以相对产甲烷活性(RA)和COD去除率为指标,考察不同浓度甲苯二胺对厌氧污泥微生物活性的影响。实验结果表明:甲苯二胺质量浓度为0~150 mg/L时,RA接近100%甚至高于100%,COD去除率为91%~93%,与对照组无差别,对厌氧微生物几乎没有抑制作用;当甲苯二胺质量浓度为200~400 mg/L时,RA为75%~95%,COD去除率与对照组相比下降了2~6个百分点,属于轻度抑制;当甲苯二胺质量浓度高于400 mg/L时,RA在70%以下,COD去除率降至85%以下,属于中度抑制;且随着甲苯二胺质量浓度增大,RA减小、COD去除率减小,抑制作用增强。因此,为了防止甲苯二胺对厌氧污泥微生物活性的抑制,甲苯二胺质量浓度应控制在0~150 mg/L。

The effects of toluene diamine with different concentration on microbial activity of anaerobic sludge were investigated using relative methane production （RA） and COD removal rate as indicators. The experimental results showed that： When the mass concentration of toluene diamine was 0-150 mg/L, RA was close to 100% or more, and the COD removal rate was 91%-93%, and there was no difference between the control group, which indicated that the anaerobic microorganisms were not inhibited; When the mass concentration of toluene diamine was 200-400 rag/L, RA was 75%-95%, COD removal rate was 2-6 percentage points lower than that of the control group, which indicated that the anaerobic microorganisms were slightly inhibited; When the concentration of toluene diamine was higher than 400 rag/L, RA and COD removal rate were under 70% and 85% respectively, which indicated that the anaerobic microorganisms were moderately inhibited; With the increase of toluene diamine mass concentration, RA and COD removal rate were decreased, while the inhibition effect was increased. Therefore, the mass concentration of toluene diamine should be controlled at 0-150 mg/L to prevent the inhibition effect on microbial activity of anaerobic sludge.