光合细菌降解对硝基苯胺废水的试验研究

EXPERIENTAL RESEARCH ON BIODEGRADATION OF NITROANILINE WASTEWATER WITH PHOTOSYNTHETIC BACTERIA

采用光合细菌处理对硝基苯胺溶液,考察了对硝基苯胺初始含量、通气量、乙酸钠含量、温度、pH、光照度等对对硝基苯胺降解率的影响。结果表明,对硝基苯胺的初始质量浓度100 mg/L、通气量0.6 m3/(m.3min)、温度35℃、pH=7.5、光照度4 800 lx,经72 h降解率可达100%。对硝基苯胺降解反应动力学研究显示,米氏常熟Km为21.65 mg/L,最大反应速度为Vm=6.52 mg/(L.h)。反应过程总TOC降解率达98.2%,对硝基苯胺矿化率达81.0%,二次污染大为减少。

The p-nitroaniline solution was treated by photosynthetic bacteria in wastewater. The effect of initial concentration, dissolved oxygen （DO）, sodium acetate concentration, pH, temperature and illumination were discussed. The results showed that the optimal conditions for degradation ofp-nitroaniline by photosynthetic bacteria were as follows： aeration rate 0.6 m3/（m3 omin）, pH 7.5, temperature 35℃, illumination 4 800 lx, after 72 h the degration rate ofp-nitroaniline reached 100%. It was found that Km was 21.65 mg/L, Vm was 6.52 mg/（L＇h）. The total TOC degradation rate was 98.2% during the reaction process and mineralize rate was 81.0% ofp-nitroaniline, the secondary pollution was remarkable decreased.